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Merge remote-tracking branch 'origin/master' into 8282-single-match

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This commit is contained in:
Georgy Komarov 2022-01-26 14:15:50 +03:00
commit 5416a71dae
118 changed files with 2428 additions and 1041 deletions
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4
CHANGELOG.md
View file

@ -981,7 +981,7 @@ Released 2021-03-25
[#6532](https://github.com/rust-lang/rust-clippy/pull/6532)
* [`single_match`] Suggest `if` over `if let` when possible
[#6574](https://github.com/rust-lang/rust-clippy/pull/6574)
* [`ref_in_deref`] Use parentheses correctly in suggestion
* `ref_in_deref` Use parentheses correctly in suggestion
[#6609](https://github.com/rust-lang/rust-clippy/pull/6609)
* [`stable_sort_primitive`] Clarify error message
[#6611](https://github.com/rust-lang/rust-clippy/pull/6611)
@ -3049,6 +3049,7 @@ Released 2018-09-13
[`iter_not_returning_iterator`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_not_returning_iterator
[`iter_nth`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_nth
[`iter_nth_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_nth_zero
[`iter_overeager_cloned`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_overeager_cloned
[`iter_skip_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#iter_skip_next
[`iterator_step_by_zero`]: https://rust-lang.github.io/rust-clippy/master/index.html#iterator_step_by_zero
[`just_underscores_and_digits`]: https://rust-lang.github.io/rust-clippy/master/index.html#just_underscores_and_digits
@ -3226,7 +3227,6 @@ Released 2018-09-13
[`redundant_slicing`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_slicing
[`redundant_static_lifetimes`]: https://rust-lang.github.io/rust-clippy/master/index.html#redundant_static_lifetimes
[`ref_binding_to_reference`]: https://rust-lang.github.io/rust-clippy/master/index.html#ref_binding_to_reference
[`ref_in_deref`]: https://rust-lang.github.io/rust-clippy/master/index.html#ref_in_deref
[`ref_option_ref`]: https://rust-lang.github.io/rust-clippy/master/index.html#ref_option_ref
[`regex_macro`]: https://rust-lang.github.io/rust-clippy/master/index.html#regex_macro
[`repeat_once`]: https://rust-lang.github.io/rust-clippy/master/index.html#repeat_once

2
COPYRIGHT
View file

@ -1,4 +1,4 @@
Copyright 2014-2021 The Rust Project Developers
Copyright 2014-2022 The Rust Project Developers
Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
http://www.apache.org/licenses/LICENSE-2.0> or the MIT license

2
LICENSE-APACHE
View file

@ -186,7 +186,7 @@ APPENDIX: How to apply the Apache License to your work.
same "printed page" as the copyright notice for easier
identification within third-party archives.
Copyright 2014-2021 The Rust Project Developers
Copyright 2014-2022 The Rust Project Developers
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.

2
LICENSE-MIT
View file

@ -1,6 +1,6 @@
MIT License
Copyright (c) 2014-2021 The Rust Project Developers
Copyright (c) 2014-2022 The Rust Project Developers
Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated

2
README.md
View file

@ -238,7 +238,7 @@ If you want to contribute to Clippy, you can find more information in [CONTRIBUT
## License
Copyright 2014-2021 The Rust Project Developers
Copyright 2014-2022 The Rust Project Developers
Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
[https://www.apache.org/licenses/LICENSE-2.0](https://www.apache.org/licenses/LICENSE-2.0)> or the MIT license

7
clippy_dev/src/bless.rs
View file

@ -9,9 +9,14 @@ use walkdir::WalkDir;
use crate::clippy_project_root;
#[cfg(not(windows))]
static CARGO_CLIPPY_EXE: &str = "cargo-clippy";
#[cfg(windows)]
static CARGO_CLIPPY_EXE: &str = "cargo-clippy.exe";
static CLIPPY_BUILD_TIME: SyncLazy<Option<std::time::SystemTime>> = SyncLazy::new(|| {
let mut path = std::env::current_exe().unwrap();
path.set_file_name("cargo-clippy");
path.set_file_name(CARGO_CLIPPY_EXE);
fs::metadata(path).ok()?.modified().ok()
});

1
clippy_dev/src/lint.rs
View file

@ -7,7 +7,6 @@ pub fn run(filename: &str) {
.args(["-Z", "no-codegen"])
.args(["--edition", "2021"])
.arg(filename)
.env("__CLIPPY_INTERNAL_TESTS", "true")
.status()
.expect("failed to run cargo")
.code();

24
clippy_lints/src/bit_mask.rs
View file

@ -18,14 +18,14 @@ declare_clippy_lint! {
/// {`!=`, `>=`, `>`, `!=`, `>=`, `>`}) can be determined from the following
/// table:
///
/// |Comparison |Bit Op|Example |is always|Formula |
/// |------------|------|------------|---------|----------------------|
/// |`==` or `!=`| `&` |`x & 2 == 3`|`false` |`c & m != c` |
/// |`<` or `>=`| `&` |`x & 2 < 3` |`true` |`m < c` |
/// |`>` or `<=`| `&` |`x & 1 > 1` |`false` |`m <= c` |
/// |`==` or `!=`| `|` |`x | 1 == 0`|`false` |`c | m != c` |
/// |`<` or `>=`| `|` |`x | 1 < 1` |`false` |`m >= c` |
/// |`<=` or `>` | `|` |`x | 1 > 0` |`true` |`m > c` |
/// |Comparison |Bit Op|Example |is always|Formula |
/// |------------|------|-------------|---------|----------------------|
/// |`==` or `!=`| `&` |`x & 2 == 3` |`false` |`c & m != c` |
/// |`<` or `>=`| `&` |`x & 2 < 3` |`true` |`m < c` |
/// |`>` or `<=`| `&` |`x & 1 > 1` |`false` |`m <= c` |
/// |`==` or `!=`| `\|` |`x \| 1 == 0`|`false` |`c \| m != c` |
/// |`<` or `>=`| `\|` |`x \| 1 < 1` |`false` |`m >= c` |
/// |`<=` or `>` | `\|` |`x \| 1 > 0` |`true` |`m > c` |
///
/// ### Why is this bad?
/// If the bits that the comparison cares about are always
@ -53,10 +53,10 @@ declare_clippy_lint! {
/// without changing the outcome. The basic structure can be seen in the
/// following table:
///
/// |Comparison| Bit Op |Example |equals |
/// |----------|---------|-----------|-------|
/// |`>` / `<=`|`|` / `^`|`x | 2 > 3`|`x > 3`|
/// |`<` / `>=`|`|` / `^`|`x ^ 1 < 4`|`x < 4`|
/// |Comparison| Bit Op |Example |equals |
/// |----------|----------|------------|-------|
/// |`>` / `<=`|`\|` / `^`|`x \| 2 > 3`|`x > 3`|
/// |`<` / `>=`|`\|` / `^`|`x ^ 1 < 4` |`x < 4`|
///
/// ### Why is this bad?
/// Not equally evil as [`bad_bit_mask`](#bad_bit_mask),

4
clippy_lints/src/borrow_as_ptr.rs
View file

@ -5,7 +5,7 @@ use clippy_utils::{meets_msrv, msrvs};
use if_chain::if_chain;
use rustc_errors::Applicability;
use rustc_hir::{BorrowKind, Expr, ExprKind, Mutability, TyKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_lint::{LateContext, LateLintPass, LintContext};
use rustc_semver::RustcVersion;
use rustc_session::{declare_tool_lint, impl_lint_pass};
@ -94,4 +94,6 @@ impl<'tcx> LateLintPass<'tcx> for BorrowAsPtr {
}
}
}
extract_msrv_attr!(LateContext);
}

29
clippy_lints/src/copies.rs
View file

@ -183,7 +183,7 @@ impl<'tcx> LateLintPass<'tcx> for CopyAndPaste {
lint_same_cond(cx, &conds);
lint_same_fns_in_if_cond(cx, &conds);
// Block duplication
lint_same_then_else(cx, &blocks, conds.len() == blocks.len(), expr);
lint_same_then_else(cx, &conds, &blocks, conds.len() == blocks.len(), expr);
}
}
}
@ -192,6 +192,7 @@ impl<'tcx> LateLintPass<'tcx> for CopyAndPaste {
/// Implementation of `BRANCHES_SHARING_CODE` and `IF_SAME_THEN_ELSE` if the blocks are equal.
fn lint_same_then_else<'tcx>(
cx: &LateContext<'tcx>,
conds: &[&'tcx Expr<'_>],
blocks: &[&Block<'tcx>],
has_conditional_else: bool,
expr: &'tcx Expr<'_>,
@ -204,7 +205,7 @@ fn lint_same_then_else<'tcx>(
// Check if each block has shared code
let has_expr = blocks[0].expr.is_some();
let (start_eq, mut end_eq, expr_eq) = if let Some(block_eq) = scan_block_for_eq(cx, blocks) {
let (start_eq, mut end_eq, expr_eq) = if let Some(block_eq) = scan_block_for_eq(cx, conds, blocks) {
(block_eq.start_eq, block_eq.end_eq, block_eq.expr_eq)
} else {
return;
@ -316,14 +317,14 @@ struct BlockEqual {
/// This function can also trigger the `IF_SAME_THEN_ELSE` in which case it'll return `None` to
/// abort any further processing and avoid duplicate lint triggers.
fn scan_block_for_eq(cx: &LateContext<'_>, blocks: &[&Block<'_>]) -> Option<BlockEqual> {
fn scan_block_for_eq(cx: &LateContext<'_>, conds: &[&Expr<'_>], blocks: &[&Block<'_>]) -> Option<BlockEqual> {
let mut start_eq = usize::MAX;
let mut end_eq = usize::MAX;
let mut expr_eq = true;
let mut iter = blocks.windows(2);
while let Some(&[win0, win1]) = iter.next() {
let l_stmts = win0.stmts;
let r_stmts = win1.stmts;
let mut iter = blocks.windows(2).enumerate();
while let Some((i, &[block0, block1])) = iter.next() {
let l_stmts = block0.stmts;
let r_stmts = block1.stmts;
// `SpanlessEq` now keeps track of the locals and is therefore context sensitive clippy#6752.
// The comparison therefore needs to be done in a way that builds the correct context.
@ -340,22 +341,26 @@ fn scan_block_for_eq(cx: &LateContext<'_>, blocks: &[&Block<'_>]) -> Option<Bloc
it1.zip(it2)
.fold(0, |acc, (l, r)| if evaluator.eq_stmt(l, r) { acc + 1 } else { 0 })
};
let block_expr_eq = both(&win0.expr, &win1.expr, |l, r| evaluator.eq_expr(l, r));
let block_expr_eq = both(&block0.expr, &block1.expr, |l, r| evaluator.eq_expr(l, r));
// IF_SAME_THEN_ELSE
if_chain! {
if block_expr_eq;
if l_stmts.len() == r_stmts.len();
if l_stmts.len() == current_start_eq;
if !is_lint_allowed(cx, IF_SAME_THEN_ELSE, win0.hir_id);
if !is_lint_allowed(cx, IF_SAME_THEN_ELSE, win1.hir_id);
// `conds` may have one last item than `blocks`.
// Any `i` from `blocks.windows(2)` will exist in `conds`, but `i+1` may not exist on the last iteration.
if !matches!(conds[i].kind, ExprKind::Let(..));
if !matches!(conds.get(i + 1).map(|e| &e.kind), Some(ExprKind::Let(..)));
if !is_lint_allowed(cx, IF_SAME_THEN_ELSE, block0.hir_id);
if !is_lint_allowed(cx, IF_SAME_THEN_ELSE, block1.hir_id);
then {
span_lint_and_note(
cx,
IF_SAME_THEN_ELSE,
win0.span,
block0.span,
"this `if` has identical blocks",
Some(win1.span),
Some(block1.span),
"same as this",
);

199
clippy_lints/src/dereference.rs
View file

@ -1,5 +1,6 @@
use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_and_then};
use clippy_utils::source::{snippet_with_applicability, snippet_with_context};
use clippy_utils::sugg::has_enclosing_paren;
use clippy_utils::ty::peel_mid_ty_refs;
use clippy_utils::{get_parent_expr, get_parent_node, is_lint_allowed, path_to_local};
use rustc_ast::util::parser::{PREC_POSTFIX, PREC_PREFIX};
@ -10,11 +11,10 @@ use rustc_hir::{
Pat, PatKind, UnOp,
};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow};
use rustc_middle::ty::adjustment::{Adjust, Adjustment, AutoBorrow, AutoBorrowMutability};
use rustc_middle::ty::{self, Ty, TyCtxt, TyS, TypeckResults};
use rustc_session::{declare_tool_lint, impl_lint_pass};
use rustc_span::{symbol::sym, Span};
use std::iter;
declare_clippy_lint! {
/// ### What it does
@ -131,8 +131,6 @@ pub struct Dereferencing {
struct StateData {
/// Span of the top level expression
span: Span,
/// The required mutability
target_mut: Mutability,
}
enum State {
@ -141,9 +139,13 @@ enum State {
// The number of calls in a sequence which changed the referenced type
ty_changed_count: usize,
is_final_ufcs: bool,
/// The required mutability
target_mut: Mutability,
},
DerefedBorrow {
count: u32,
count: usize,
required_precedence: i8,
msg: &'static str,
},
}
@ -214,59 +216,98 @@ impl<'tcx> LateLintPass<'tcx> for Dereferencing {
1
},
is_final_ufcs: matches!(expr.kind, ExprKind::Call(..)),
},
StateData {
span: expr.span,
target_mut,
},
StateData { span: expr.span },
));
},
RefOp::AddrOf => {
// Find the number of times the borrow is auto-derefed.
let mut iter = find_adjustments(cx.tcx, typeck, expr).iter();
if let Some((i, adjust)) = iter.by_ref().enumerate().find_map(|(i, adjust)| {
if !matches!(adjust.kind, Adjust::Deref(_)) {
Some((i, adjust))
} else if !adjust.target.is_ref() {
// Add one to the number of references found.
Some((i + 1, adjust))
let mut deref_count = 0usize;
let next_adjust = loop {
match iter.next() {
Some(adjust) => {
if !matches!(adjust.kind, Adjust::Deref(_)) {
break Some(adjust);
} else if !adjust.target.is_ref() {
deref_count += 1;
break iter.next();
}
deref_count += 1;
},
None => break None,
};
};
// Determine the required number of references before any can be removed. In all cases the
// reference made by the current expression will be removed. After that there are four cases to
// handle.
//
// 1. Auto-borrow will trigger in the current position, so no further references are required.
// 2. Auto-deref ends at a reference, or the underlying type, so one extra needs to be left to
// handle the automatically inserted re-borrow.
// 3. Auto-deref hits a user-defined `Deref` impl, so at least one reference needs to exist to
// start auto-deref.
// 4. If the chain of non-user-defined derefs ends with a mutable re-borrow, and re-borrow
// adjustments will not be inserted automatically, then leave one further reference to avoid
// moving a mutable borrow.
// e.g.
// fn foo<T>(x: &mut Option<&mut T>, y: &mut T) {
// let x = match x {
// // Removing the borrow will cause `x` to be moved
// Some(x) => &mut *x,
// None => y
// };
// }
let deref_msg =
"this expression creates a reference which is immediately dereferenced by the compiler";
let borrow_msg = "this expression borrows a value the compiler would automatically borrow";
let (required_refs, required_precedence, msg) = if is_auto_borrow_position(parent, expr.hir_id)
{
(1, PREC_POSTFIX, if deref_count == 1 { borrow_msg } else { deref_msg })
} else if let Some(&Adjust::Borrow(AutoBorrow::Ref(_, mutability))) =
next_adjust.map(|a| &a.kind)
{
if matches!(mutability, AutoBorrowMutability::Mut { .. })
&& !is_auto_reborrow_position(parent)
{
(3, 0, deref_msg)
} else {
None
}
}) {
// Found two consecutive derefs. At least one can be removed.
if i > 1 {
let target_mut = iter::once(adjust)
.chain(iter)
.find_map(|adjust| match adjust.kind {
Adjust::Borrow(AutoBorrow::Ref(_, m)) => Some(m.into()),
_ => None,
})
// This default should never happen. Auto-deref always reborrows.
.unwrap_or(Mutability::Not);
self.state = Some((
// Subtract one for the current borrow expression, and one to cover the last
// reference which can't be removed (it's either reborrowed, or needed for
// auto-deref to happen).
State::DerefedBorrow {
count:
// Truncation here would require more than a `u32::MAX` level reference. The compiler
// does not support this.
#[allow(clippy::cast_possible_truncation)]
{ i as u32 - 2 }
},
StateData {
span: expr.span,
target_mut,
},
));
(2, 0, deref_msg)
}
} else {
(2, 0, deref_msg)
};
if deref_count >= required_refs {
self.state = Some((
State::DerefedBorrow {
// One of the required refs is for the current borrow expression, the remaining ones
// can't be removed without breaking the code. See earlier comment.
count: deref_count - required_refs,
required_precedence,
msg,
},
StateData { span: expr.span },
));
}
},
_ => (),
}
},
(Some((State::DerefMethod { ty_changed_count, .. }, data)), RefOp::Method(_)) => {
(
Some((
State::DerefMethod {
target_mut,
ty_changed_count,
..
},
data,
)),
RefOp::Method(_),
) => {
self.state = Some((
State::DerefMethod {
ty_changed_count: if deref_method_same_type(typeck.expr_ty(expr), typeck.expr_ty(sub_expr)) {
@ -275,12 +316,30 @@ impl<'tcx> LateLintPass<'tcx> for Dereferencing {
ty_changed_count + 1
},
is_final_ufcs: matches!(expr.kind, ExprKind::Call(..)),
target_mut,
},
data,
));
},
(Some((State::DerefedBorrow { count }, data)), RefOp::AddrOf) if count != 0 => {
self.state = Some((State::DerefedBorrow { count: count - 1 }, data));
(
Some((
State::DerefedBorrow {
count,
required_precedence,
msg,
},
data,
)),
RefOp::AddrOf,
) if count != 0 => {
self.state = Some((
State::DerefedBorrow {
count: count - 1,
required_precedence,
msg,
},
data,
));
},
(Some((state, data)), _) => report(cx, expr, state, data),
@ -456,6 +515,30 @@ fn is_linted_explicit_deref_position(parent: Option<Node<'_>>, child_id: HirId,
}
}
/// Checks if the given expression is in a position which can be auto-reborrowed.
/// Note: This is only correct assuming auto-deref is already occurring.
fn is_auto_reborrow_position(parent: Option<Node<'_>>) -> bool {
match parent {
Some(Node::Expr(parent)) => matches!(parent.kind, ExprKind::MethodCall(..) | ExprKind::Call(..)),
Some(Node::Local(_)) => true,
_ => false,
}
}
/// Checks if the given expression is a position which can auto-borrow.
fn is_auto_borrow_position(parent: Option<Node<'_>>, child_id: HirId) -> bool {
if let Some(Node::Expr(parent)) = parent {
match parent.kind {
ExprKind::MethodCall(_, _, [self_arg, ..], _) => self_arg.hir_id == child_id,
ExprKind::Field(..) => true,
ExprKind::Call(f, _) => f.hir_id == child_id,
_ => false,
}
} else {
false
}
}
/// Adjustments are sometimes made in the parent block rather than the expression itself.
fn find_adjustments<'tcx>(
tcx: TyCtxt<'tcx>,
@ -504,6 +587,7 @@ fn report(cx: &LateContext<'_>, expr: &Expr<'_>, state: State, data: StateData)
State::DerefMethod {
ty_changed_count,
is_final_ufcs,
target_mut,
} => {
let mut app = Applicability::MachineApplicable;
let (expr_str, expr_is_macro_call) = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app);
@ -518,12 +602,12 @@ fn report(cx: &LateContext<'_>, expr: &Expr<'_>, state: State, data: StateData)
};
let addr_of_str = if ty_changed_count < ref_count {
// Check if a reborrow from &mut T -> &T is required.
if data.target_mut == Mutability::Not && matches!(ty.kind(), ty::Ref(_, _, Mutability::Mut)) {
if target_mut == Mutability::Not && matches!(ty.kind(), ty::Ref(_, _, Mutability::Mut)) {
"&*"
} else {
""
}
} else if data.target_mut == Mutability::Mut {
} else if target_mut == Mutability::Mut {
"&mut "
} else {
"&"
@ -539,7 +623,7 @@ fn report(cx: &LateContext<'_>, expr: &Expr<'_>, state: State, data: StateData)
cx,
EXPLICIT_DEREF_METHODS,
data.span,
match data.target_mut {
match target_mut {
Mutability::Not => "explicit `deref` method call",
Mutability::Mut => "explicit `deref_mut` method call",
},
@ -548,19 +632,24 @@ fn report(cx: &LateContext<'_>, expr: &Expr<'_>, state: State, data: StateData)
app,
);
},
State::DerefedBorrow { .. } => {
State::DerefedBorrow {
required_precedence,
msg,
..
} => {
let mut app = Applicability::MachineApplicable;
let snip = snippet_with_context(cx, expr.span, data.span.ctxt(), "..", &mut app).0;
span_lint_and_sugg(
cx,
NEEDLESS_BORROW,
data.span,
&format!(
"this expression borrows a reference (`{}`) that is immediately dereferenced by the compiler",
cx.typeck_results().expr_ty(expr),
),
msg,
"change this to",
snip.into(),
if required_precedence > expr.precedence().order() && !has_enclosing_paren(&snip) {
format!("({})", snip)
} else {
snip.into()
},
app,
);
},

3
clippy_lints/src/enum_variants.rs
View file

@ -172,6 +172,9 @@ fn check_variant(cx: &LateContext<'_>, threshold: u64, def: &EnumDef<'_>, item_n
let name = var.ident.name.as_str();
let variant_split = camel_case_split(name);
if variant_split.len() == 1 {
return;
}
pre = pre
.iter()

69
clippy_lints/src/eq_op.rs
View file

@ -1,12 +1,16 @@
use clippy_utils::diagnostics::{multispan_sugg, span_lint, span_lint_and_then};
use clippy_utils::get_enclosing_block;
use clippy_utils::macros::{find_assert_eq_args, first_node_macro_backtrace};
use clippy_utils::source::snippet;
use clippy_utils::ty::{implements_trait, is_copy};
use clippy_utils::{ast_utils::is_useless_with_eq_exprs, eq_expr_value, is_in_test_function};
use if_chain::if_chain;
use rustc_errors::Applicability;
use rustc_hir::{BinOpKind, BorrowKind, Expr, ExprKind};
use rustc_hir::{
def::Res, def_id::DefId, BinOpKind, BorrowKind, Expr, ExprKind, GenericArg, ItemKind, QPath, Ty, TyKind,
};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty::{self, TyS};
use rustc_session::{declare_lint_pass, declare_tool_lint};
declare_clippy_lint! {
@ -146,6 +150,13 @@ impl<'tcx> LateLintPass<'tcx> for EqOp {
let rty = cx.typeck_results().expr_ty(r);
let lcpy = is_copy(cx, lty);
let rcpy = is_copy(cx, rty);
if let Some((self_ty, other_ty)) = in_impl(cx, e, trait_id) {
if (are_equal(cx, rty, self_ty) && are_equal(cx, lty, other_ty))
|| (are_equal(cx, rty, other_ty) && are_equal(cx, lty, self_ty))
{
return; // Don't lint
}
}
// either operator autorefs or both args are copyable
if (requires_ref || (lcpy && rcpy)) && implements_trait(cx, lty, trait_id, &[rty.into()]) {
span_lint_and_then(
@ -206,6 +217,14 @@ impl<'tcx> LateLintPass<'tcx> for EqOp {
// &foo == bar
(&ExprKind::AddrOf(BorrowKind::Ref, _, l), _) => {
let lty = cx.typeck_results().expr_ty(l);
if let Some((self_ty, other_ty)) = in_impl(cx, e, trait_id) {
let rty = cx.typeck_results().expr_ty(right);
if (are_equal(cx, rty, self_ty) && are_equal(cx, lty, other_ty))
|| (are_equal(cx, rty, other_ty) && are_equal(cx, lty, self_ty))
{
return; // Don't lint
}
}
let lcpy = is_copy(cx, lty);
if (requires_ref || lcpy)
&& implements_trait(cx, lty, trait_id, &[cx.typeck_results().expr_ty(right).into()])
@ -230,6 +249,14 @@ impl<'tcx> LateLintPass<'tcx> for EqOp {
// foo == &bar
(_, &ExprKind::AddrOf(BorrowKind::Ref, _, r)) => {
let rty = cx.typeck_results().expr_ty(r);
if let Some((self_ty, other_ty)) = in_impl(cx, e, trait_id) {
let lty = cx.typeck_results().expr_ty(left);
if (are_equal(cx, rty, self_ty) && are_equal(cx, lty, other_ty))
|| (are_equal(cx, rty, other_ty) && are_equal(cx, lty, self_ty))
{
return; // Don't lint
}
}
let rcpy = is_copy(cx, rty);
if (requires_ref || rcpy)
&& implements_trait(cx, cx.typeck_results().expr_ty(left), trait_id, &[rty.into()])
@ -251,3 +278,43 @@ impl<'tcx> LateLintPass<'tcx> for EqOp {
}
}
}
fn in_impl<'tcx>(cx: &LateContext<'tcx>, e: &'tcx Expr<'_>, bin_op: DefId) -> Option<(&'tcx Ty<'tcx>, &'tcx Ty<'tcx>)> {
if_chain! {
if let Some(block) = get_enclosing_block(cx, e.hir_id);
if let Some(impl_def_id) = cx.tcx.impl_of_method(block.hir_id.owner.to_def_id());
let item = cx.tcx.hir().expect_item(impl_def_id.expect_local());
if let ItemKind::Impl(item) = &item.kind;
if let Some(of_trait) = &item.of_trait;
if let Some(seg) = of_trait.path.segments.last();
if let Some(Res::Def(_, trait_id)) = seg.res;
if trait_id == bin_op;
if let Some(generic_args) = seg.args;
if let Some(GenericArg::Type(other_ty)) = generic_args.args.last();
then {
Some((item.self_ty, other_ty))
}
else {
None
}
}
}
fn are_equal<'tcx>(cx: &LateContext<'tcx>, middle_ty: &TyS<'_>, hir_ty: &Ty<'_>) -> bool {
if_chain! {
if let ty::Adt(adt_def, _) = middle_ty.kind();
if let Some(local_did) = adt_def.did.as_local();
let item = cx.tcx.hir().expect_item(local_did);
let middle_ty_id = item.def_id.to_def_id();
if let TyKind::Path(QPath::Resolved(_, path)) = hir_ty.kind;
if let Res::Def(_, hir_ty_id) = path.res;
then {
hir_ty_id == middle_ty_id
}
else {
false
}
}
}

19
clippy_lints/src/format.rs
View file

@ -9,7 +9,7 @@ use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty;
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::symbol::kw;
use rustc_span::{sym, Span};
use rustc_span::{sym, BytePos, Span};
declare_clippy_lint! {
/// ### What it does
@ -84,7 +84,22 @@ impl<'tcx> LateLintPass<'tcx> for UselessFormat {
ExprKind::MethodCall(path, ..) => path.ident.name.as_str() == "to_string",
_ => false,
};
let sugg = if is_new_string {
let sugg = if format_args.format_string_span.contains(value.span) {
// Implicit argument. e.g. `format!("{x}")` span points to `{x}`
let spdata = value.span.data();
let span = Span::new(
spdata.lo + BytePos(1),
spdata.hi - BytePos(1),
spdata.ctxt,
spdata.parent
);
let snip = snippet_with_applicability(cx, span, "..", &mut applicability);
if is_new_string {
snip.into()
} else {
format!("{snip}.to_string()")
}
} else if is_new_string {
snippet_with_applicability(cx, value.span, "..", &mut applicability).into_owned()
} else {
let sugg = Sugg::hir_with_applicability(cx, value, "<arg>", &mut applicability);

2
clippy_lints/src/implicit_hasher.rs
View file

@ -179,7 +179,7 @@ impl<'tcx> LateLintPass<'tcx> for ImplicitHasher {
)
.and_then(|snip| {
let i = snip.find("fn")?;
Some(item.span.lo() + BytePos((i + (&snip[i..]).find('(')?) as u32))
Some(item.span.lo() + BytePos((i + snip[i..].find('(')?) as u32))
})
.expect("failed to create span for type parameters");
Span::new(pos, pos, item.span.ctxt(), item.span.parent())

3
clippy_lints/src/lib.register_all.rs
View file

@ -156,6 +156,7 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![
LintId::of(methods::ITER_NEXT_SLICE),
LintId::of(methods::ITER_NTH),
LintId::of(methods::ITER_NTH_ZERO),
LintId::of(methods::ITER_OVEREAGER_CLONED),
LintId::of(methods::ITER_SKIP_NEXT),
LintId::of(methods::MANUAL_FILTER_MAP),
LintId::of(methods::MANUAL_FIND_MAP),
@ -246,10 +247,8 @@ store.register_group(true, "clippy::all", Some("clippy_all"), vec![
LintId::of(redundant_slicing::REDUNDANT_SLICING),
LintId::of(redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES),
LintId::of(reference::DEREF_ADDROF),
LintId::of(reference::REF_IN_DEREF),
LintId::of(regex::INVALID_REGEX),
LintId::of(repeat_once::REPEAT_ONCE),
LintId::of(return_self_not_must_use::RETURN_SELF_NOT_MUST_USE),
LintId::of(returns::LET_AND_RETURN),
LintId::of(returns::NEEDLESS_RETURN),
LintId::of(self_assignment::SELF_ASSIGNMENT),

1
clippy_lints/src/lib.register_complexity.rs
View file

@ -71,7 +71,6 @@ store.register_group(true, "clippy::complexity", Some("clippy_complexity"), vec!
LintId::of(redundant_closure_call::REDUNDANT_CLOSURE_CALL),
LintId::of(redundant_slicing::REDUNDANT_SLICING),
LintId::of(reference::DEREF_ADDROF),
LintId::of(reference::REF_IN_DEREF),
LintId::of(repeat_once::REPEAT_ONCE),
LintId::of(strings::STRING_FROM_UTF8_AS_BYTES),
LintId::of(strlen_on_c_strings::STRLEN_ON_C_STRINGS),

2
clippy_lints/src/lib.register_lints.rs
View file

@ -288,6 +288,7 @@ store.register_lints(&[
methods::ITER_NEXT_SLICE,
methods::ITER_NTH,
methods::ITER_NTH_ZERO,
methods::ITER_OVEREAGER_CLONED,
methods::ITER_SKIP_NEXT,
methods::MANUAL_FILTER_MAP,
methods::MANUAL_FIND_MAP,
@ -422,7 +423,6 @@ store.register_lints(&[
redundant_static_lifetimes::REDUNDANT_STATIC_LIFETIMES,
ref_option_ref::REF_OPTION_REF,
reference::DEREF_ADDROF,
reference::REF_IN_DEREF,
regex::INVALID_REGEX,
regex::TRIVIAL_REGEX,
repeat_once::REPEAT_ONCE,

1
clippy_lints/src/lib.register_pedantic.rs
View file

@ -81,6 +81,7 @@ store.register_group(true, "clippy::pedantic", Some("clippy_pedantic"), vec![
LintId::of(ranges::RANGE_PLUS_ONE),
LintId::of(redundant_else::REDUNDANT_ELSE),
LintId::of(ref_option_ref::REF_OPTION_REF),
LintId::of(return_self_not_must_use::RETURN_SELF_NOT_MUST_USE),
LintId::of(semicolon_if_nothing_returned::SEMICOLON_IF_NOTHING_RETURNED),
LintId::of(strings::STRING_ADD_ASSIGN),
LintId::of(trait_bounds::TRAIT_DUPLICATION_IN_BOUNDS),

1
clippy_lints/src/lib.register_perf.rs
View file

@ -14,6 +14,7 @@ store.register_group(true, "clippy::perf", Some("clippy_perf"), vec![
LintId::of(methods::EXPECT_FUN_CALL),
LintId::of(methods::EXTEND_WITH_DRAIN),
LintId::of(methods::ITER_NTH),
LintId::of(methods::ITER_OVEREAGER_CLONED),
LintId::of(methods::MANUAL_STR_REPEAT),
LintId::of(methods::OR_FUN_CALL),
LintId::of(methods::SINGLE_CHAR_PATTERN),

1
clippy_lints/src/lib.register_suspicious.rs
View file

@ -16,7 +16,6 @@ store.register_group(true, "clippy::suspicious", Some("clippy_suspicious"), vec!
LintId::of(methods::SUSPICIOUS_MAP),
LintId::of(mut_key::MUTABLE_KEY_TYPE),
LintId::of(octal_escapes::OCTAL_ESCAPES),
LintId::of(return_self_not_must_use::RETURN_SELF_NOT_MUST_USE),
LintId::of(suspicious_trait_impl::SUSPICIOUS_ARITHMETIC_IMPL),
LintId::of(suspicious_trait_impl::SUSPICIOUS_OP_ASSIGN_IMPL),
])

4
clippy_lints/src/lib.rs
View file

@ -581,6 +581,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
store.register_late_pass(move || Box::new(needless_question_mark::NeedlessQuestionMark));
store.register_late_pass(move || Box::new(casts::Casts::new(msrv)));
store.register_early_pass(move || Box::new(unnested_or_patterns::UnnestedOrPatterns::new(msrv)));
store.register_late_pass(move || Box::new(map_clone::MapClone::new(msrv)));
store.register_late_pass(|| Box::new(size_of_in_element_count::SizeOfInElementCount));
store.register_late_pass(|| Box::new(same_name_method::SameNameMethod));
@ -591,7 +592,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
msrv,
))
});
store.register_late_pass(|| Box::new(map_clone::MapClone));
store.register_late_pass(|| Box::new(map_err_ignore::MapErrIgnore));
store.register_late_pass(|| Box::new(shadow::Shadow::default()));
store.register_late_pass(|| Box::new(unit_types::UnitTypes));
@ -703,7 +703,6 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
store.register_late_pass(|| Box::new(mut_key::MutableKeyType));
store.register_late_pass(|| Box::new(modulo_arithmetic::ModuloArithmetic));
store.register_early_pass(|| Box::new(reference::DerefAddrOf));
store.register_early_pass(|| Box::new(reference::RefInDeref));
store.register_early_pass(|| Box::new(double_parens::DoubleParens));
store.register_late_pass(|| Box::new(to_string_in_display::ToStringInDisplay::new()));
store.register_early_pass(|| Box::new(unsafe_removed_from_name::UnsafeNameRemoval));
@ -935,6 +934,7 @@ pub fn register_renamed(ls: &mut rustc_lint::LintStore) {
ls.register_renamed("clippy::if_let_some_result", "clippy::match_result_ok");
ls.register_renamed("clippy::disallowed_type", "clippy::disallowed_types");
ls.register_renamed("clippy::disallowed_method", "clippy::disallowed_methods");
ls.register_renamed("clippy::ref_in_deref", "clippy::needless_borrow");
// uplifted lints
ls.register_renamed("clippy::invalid_ref", "invalid_value");

52
clippy_lints/src/lifetimes.rs
View file

@ -15,7 +15,7 @@ use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::hir::map::Map;
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::source_map::Span;
use rustc_span::symbol::{kw, Symbol};
use rustc_span::symbol::{kw, Ident, Symbol};
declare_clippy_lint! {
/// ### What it does
@ -85,7 +85,7 @@ declare_lint_pass!(Lifetimes => [NEEDLESS_LIFETIMES, EXTRA_UNUSED_LIFETIMES]);
impl<'tcx> LateLintPass<'tcx> for Lifetimes {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
if let ItemKind::Fn(ref sig, ref generics, id) = item.kind {
check_fn_inner(cx, sig.decl, Some(id), generics, item.span, true);
check_fn_inner(cx, sig.decl, Some(id), None, generics, item.span, true);
}
}
@ -96,6 +96,7 @@ impl<'tcx> LateLintPass<'tcx> for Lifetimes {
cx,
sig.decl,
Some(id),
None,
&item.generics,
item.span,
report_extra_lifetimes,
@ -105,11 +106,11 @@ impl<'tcx> LateLintPass<'tcx> for Lifetimes {
fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
if let TraitItemKind::Fn(ref sig, ref body) = item.kind {
let body = match *body {
TraitFn::Required(_) => None,
TraitFn::Provided(id) => Some(id),
let (body, trait_sig) = match *body {
TraitFn::Required(sig) => (None, Some(sig)),
TraitFn::Provided(id) => (Some(id), None),
};
check_fn_inner(cx, sig.decl, body, &item.generics, item.span, true);
check_fn_inner(cx, sig.decl, body, trait_sig, &item.generics, item.span, true);
}
}
}
@ -126,6 +127,7 @@ fn check_fn_inner<'tcx>(
cx: &LateContext<'tcx>,
decl: &'tcx FnDecl<'_>,
body: Option<BodyId>,
trait_sig: Option<&[Ident]>,
generics: &'tcx Generics<'_>,
span: Span,
report_extra_lifetimes: bool,
@ -167,7 +169,7 @@ fn check_fn_inner<'tcx>(
}
}
}
if could_use_elision(cx, decl, body, generics.params) {
if could_use_elision(cx, decl, body, trait_sig, generics.params) {
span_lint(
cx,
NEEDLESS_LIFETIMES,
@ -181,10 +183,31 @@ fn check_fn_inner<'tcx>(
}
}
// elision doesn't work for explicit self types, see rust-lang/rust#69064
fn explicit_self_type<'tcx>(cx: &LateContext<'tcx>, func: &FnDecl<'tcx>, ident: Option<Ident>) -> bool {
if_chain! {
if let Some(ident) = ident;
if ident.name == kw::SelfLower;
if !func.implicit_self.has_implicit_self();
if let Some(self_ty) = func.inputs.first();
then {
let mut visitor = RefVisitor::new(cx);
visitor.visit_ty(self_ty);
!visitor.all_lts().is_empty()
}
else {
false
}
}
}
fn could_use_elision<'tcx>(
cx: &LateContext<'tcx>,
func: &'tcx FnDecl<'_>,
body: Option<BodyId>,
trait_sig: Option<&[Ident]>,
named_generics: &'tcx [GenericParam<'_>],
) -> bool {
// There are two scenarios where elision works:
@ -235,11 +258,24 @@ fn could_use_elision<'tcx>(
let input_lts = input_visitor.lts;
let output_lts = output_visitor.lts;
if let Some(trait_sig) = trait_sig {
if explicit_self_type(cx, func, trait_sig.first().copied()) {
return false;
}
}
if let Some(body_id) = body {
let body = cx.tcx.hir().body(body_id);
let first_ident = body.params.first().and_then(|param| param.pat.simple_ident());
if explicit_self_type(cx, func, first_ident) {
return false;
}
let mut checker = BodyLifetimeChecker {
lifetimes_used_in_body: false,
};
checker.visit_expr(&cx.tcx.hir().body(body_id).value);
checker.visit_expr(&body.value);
if checker.lifetimes_used_in_body {
return false;
}

4
clippy_lints/src/manual_bits.rs
View file

@ -4,7 +4,7 @@ use clippy_utils::{match_def_path, meets_msrv, msrvs, paths};
use rustc_ast::ast::LitKind;
use rustc_errors::Applicability;
use rustc_hir::{BinOpKind, Expr, ExprKind, GenericArg, QPath};
use rustc_lint::{LateContext, LateLintPass};
use rustc_lint::{LateContext, LateLintPass, LintContext};
use rustc_middle::ty::{self, Ty};
use rustc_semver::RustcVersion;
use rustc_session::{declare_tool_lint, impl_lint_pass};
@ -72,6 +72,8 @@ impl<'tcx> LateLintPass<'tcx> for ManualBits {
}
}
}
extract_msrv_attr!(LateContext);
}
fn get_one_size_of_ty<'tcx>(

66
clippy_lints/src/map_clone.rs
View file

@ -1,15 +1,16 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet_with_applicability;
use clippy_utils::ty::{is_copy, is_type_diagnostic_item};
use clippy_utils::{is_trait_method, peel_blocks};
use clippy_utils::{is_trait_method, meets_msrv, msrvs, peel_blocks};
use if_chain::if_chain;
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_lint::{LateContext, LateLintPass};
use rustc_lint::{LateContext, LateLintPass, LintContext};
use rustc_middle::mir::Mutability;
use rustc_middle::ty;
use rustc_middle::ty::adjustment::Adjust;
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_semver::RustcVersion;
use rustc_session::{declare_tool_lint, impl_lint_pass};
use rustc_span::symbol::Ident;
use rustc_span::{sym, Span};
@ -42,7 +43,17 @@ declare_clippy_lint! {
"using `iterator.map(|x| x.clone())`, or dereferencing closures for `Copy` types"
}
declare_lint_pass!(MapClone => [MAP_CLONE]);
pub struct MapClone {
msrv: Option<RustcVersion>,
}
impl_lint_pass!(MapClone => [MAP_CLONE]);
impl MapClone {
pub fn new(msrv: Option<RustcVersion>) -> Self {
Self { msrv }
}
}
impl<'tcx> LateLintPass<'tcx> for MapClone {
fn check_expr(&mut self, cx: &LateContext<'_>, e: &hir::Expr<'_>) {
@ -65,7 +76,7 @@ impl<'tcx> LateLintPass<'tcx> for MapClone {
hir::BindingAnnotation::Unannotated, .., name, None
) = inner.kind {
if ident_eq(name, closure_expr) {
lint(cx, e.span, args[0].span, true);
self.lint_explicit_closure(cx, e.span, args[0].span, true);
}
},
hir::PatKind::Binding(hir::BindingAnnotation::Unannotated, .., name, None) => {
@ -73,7 +84,7 @@ impl<'tcx> LateLintPass<'tcx> for MapClone {
hir::ExprKind::Unary(hir::UnOp::Deref, inner) => {
if ident_eq(name, inner) {
if let ty::Ref(.., Mutability::Not) = cx.typeck_results().expr_ty(inner).kind() {
lint(cx, e.span, args[0].span, true);
self.lint_explicit_closure(cx, e.span, args[0].span, true);
}
}
},
@ -90,7 +101,7 @@ impl<'tcx> LateLintPass<'tcx> for MapClone {
if let ty::Ref(_, ty, mutability) = obj_ty.kind() {
if matches!(mutability, Mutability::Not) {
let copy = is_copy(cx, ty);
lint(cx, e.span, args[0].span, copy);
self.lint_explicit_closure(cx, e.span, args[0].span, copy);
}
} else {
lint_needless_cloning(cx, e.span, args[0].span);
@ -105,6 +116,8 @@ impl<'tcx> LateLintPass<'tcx> for MapClone {
}
}
}
extract_msrv_attr!(LateContext);
}
fn ident_eq(name: Ident, path: &hir::Expr<'_>) -> bool {
@ -127,31 +140,30 @@ fn lint_needless_cloning(cx: &LateContext<'_>, root: Span, receiver: Span) {
);
}
fn lint(cx: &LateContext<'_>, replace: Span, root: Span, copied: bool) {
let mut applicability = Applicability::MachineApplicable;
if copied {
impl MapClone {
fn lint_explicit_closure(&self, cx: &LateContext<'_>, replace: Span, root: Span, is_copy: bool) {
let mut applicability = Applicability::MachineApplicable;
let message = if is_copy {
"you are using an explicit closure for copying elements"
} else {
"you are using an explicit closure for cloning elements"
};
let sugg_method = if is_copy && meets_msrv(self.msrv.as_ref(), &msrvs::ITERATOR_COPIED) {
"copied"
} else {
"cloned"
};
span_lint_and_sugg(
cx,
MAP_CLONE,
replace,
"you are using an explicit closure for copying elements",
"consider calling the dedicated `copied` method",
message,
&format!("consider calling the dedicated `{}` method", sugg_method),
format!(
"{}.copied()",
snippet_with_applicability(cx, root, "..", &mut applicability)
),
applicability,
);
} else {
span_lint_and_sugg(
cx,
MAP_CLONE,
replace,
"you are using an explicit closure for cloning elements",
"consider calling the dedicated `cloned` method",
format!(
"{}.cloned()",
snippet_with_applicability(cx, root, "..", &mut applicability)
"{}.{}()",
snippet_with_applicability(cx, root, "..", &mut applicability),
sugg_method,
),
applicability,
);

8
clippy_lints/src/matches.rs
View file

@ -30,7 +30,7 @@ use rustc_middle::ty::{self, Ty, TyS, VariantDef};
use rustc_semver::RustcVersion;
use rustc_session::{declare_tool_lint, impl_lint_pass};
use rustc_span::source_map::{Span, Spanned};
use rustc_span::sym;
use rustc_span::{sym, symbol::kw};
use std::cmp::{max, Ordering};
use std::collections::hash_map::Entry;
@ -1063,13 +1063,13 @@ fn check_wild_err_arm<'tcx>(cx: &LateContext<'tcx>, ex: &Expr<'tcx>, arms: &[Arm
let path_str = rustc_hir_pretty::to_string(rustc_hir_pretty::NO_ANN, |s| s.print_qpath(path, false));
if path_str == "Err" {
let mut matching_wild = inner.iter().any(is_wild);
let mut ident_bind_name = String::from("_");
let mut ident_bind_name = kw::Underscore;
if !matching_wild {
// Looking for unused bindings (i.e.: `_e`)
for pat in inner.iter() {
if let PatKind::Binding(_, id, ident, None) = pat.kind {
if ident.as_str().starts_with('_') && !is_local_used(cx, arm.body, id) {
ident_bind_name = ident.name.as_str().to_string();
ident_bind_name = ident.name;
matching_wild = true;
}
}
@ -1084,7 +1084,7 @@ fn check_wild_err_arm<'tcx>(cx: &LateContext<'tcx>, ex: &Expr<'tcx>, arms: &[Arm
span_lint_and_note(cx,
MATCH_WILD_ERR_ARM,
arm.pat.span,
&format!("`Err({})` matches all errors", &ident_bind_name),
&format!("`Err({})` matches all errors", ident_bind_name),
None,
"match each error separately or use the error output, or use `.except(msg)` if the error case is unreachable",
);

62
clippy_lints/src/methods/iter_overeager_cloned.rs Normal file
View file

@ -0,0 +1,62 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::snippet;
use clippy_utils::ty::{get_iterator_item_ty, is_copy};
use itertools::Itertools;
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_lint::LateContext;
use rustc_middle::ty;
use std::ops::Not;
use super::ITER_OVEREAGER_CLONED;
use crate::redundant_clone::REDUNDANT_CLONE;
/// lint overeager use of `cloned()` for `Iterator`s
pub(super) fn check<'tcx>(
cx: &LateContext<'tcx>,
expr: &'tcx hir::Expr<'_>,
recv: &'tcx hir::Expr<'_>,
name: &str,
map_arg: &[hir::Expr<'_>],
) {
// Check if it's iterator and get type associated with `Item`.
let inner_ty = match get_iterator_item_ty(cx, cx.typeck_results().expr_ty_adjusted(recv)) {
Some(ty) => ty,
_ => return,
};
match inner_ty.kind() {
ty::Ref(_, ty, _) if !is_copy(cx, ty) => {},
_ => return,
};
let (lint, preserve_cloned) = match name {
"count" => (REDUNDANT_CLONE, false),
_ => (ITER_OVEREAGER_CLONED, true),
};
let wildcard_params = map_arg.is_empty().not().then(|| "...").unwrap_or_default();
let msg = format!(
"called `cloned().{}({})` on an `Iterator`. It may be more efficient to call `{}({}){}` instead",
name,
wildcard_params,
name,
wildcard_params,
preserve_cloned.then(|| ".cloned()").unwrap_or_default(),
);
span_lint_and_sugg(
cx,
lint,
expr.span,
&msg,
"try this",
format!(
"{}.{}({}){}",
snippet(cx, recv.span, ".."),
name,
map_arg.iter().map(|a| snippet(cx, a.span, "..")).join(", "),
preserve_cloned.then(|| ".cloned()").unwrap_or_default(),
),
Applicability::MachineApplicable,
);
}

84
clippy_lints/src/methods/mod.rs
View file

@ -30,6 +30,7 @@ mod iter_count;
mod iter_next_slice;
mod iter_nth;
mod iter_nth_zero;
mod iter_overeager_cloned;
mod iter_skip_next;
mod iterator_step_by_zero;
mod manual_saturating_arithmetic;
@ -106,6 +107,41 @@ declare_clippy_lint! {
"used `cloned` where `copied` could be used instead"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for usage of `_.cloned().<func>()` where call to `.cloned()` can be postponed.
///
/// ### Why is this bad?
/// It's often inefficient to clone all elements of an iterator, when eventually, only some
/// of them will be consumed.
///
/// ### Examples
/// ```rust
/// # let vec = vec!["string".to_string()];
///
/// // Bad
/// vec.iter().cloned().take(10);
///
/// // Good
/// vec.iter().take(10).cloned();
///
/// // Bad
/// vec.iter().cloned().last();
///
/// // Good
/// vec.iter().last().cloned();
///
/// ```
/// ### Known Problems
/// This `lint` removes the side of effect of cloning items in the iterator.
/// A code that relies on that side-effect could fail.
///
#[clippy::version = "1.59.0"]
pub ITER_OVEREAGER_CLONED,
perf,
"using `cloned()` early with `Iterator::iter()` can lead to some performance inefficiencies"
}
declare_clippy_lint! {
/// ### What it does
/// Checks for usages of `Iterator::flat_map()` where `filter_map()` could be
@ -1950,6 +1986,7 @@ impl_lint_pass!(Methods => [
CLONE_ON_COPY,
CLONE_ON_REF_PTR,
CLONE_DOUBLE_REF,
ITER_OVEREAGER_CLONED,
CLONED_INSTEAD_OF_COPIED,
FLAT_MAP_OPTION,
INEFFICIENT_TO_STRING,
@ -2243,9 +2280,10 @@ fn check_methods<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, msrv: Optio
},
_ => {},
},
("count", []) => match method_call(recv) {
Some((name @ ("into_iter" | "iter" | "iter_mut"), [recv2], _)) => {
iter_count::check(cx, expr, recv2, name);
(name @ "count", args @ []) => match method_call(recv) {
Some(("cloned", [recv2], _)) => iter_overeager_cloned::check(cx, expr, recv2, name, args),
Some((name2 @ ("into_iter" | "iter" | "iter_mut"), [recv2], _)) => {
iter_count::check(cx, expr, recv2, name2);
},
Some(("map", [_, arg], _)) => suspicious_map::check(cx, expr, recv, arg),
_ => {},
@ -2266,10 +2304,10 @@ fn check_methods<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, msrv: Optio
flat_map_identity::check(cx, expr, arg, span);
flat_map_option::check(cx, expr, arg, span);
},
("flatten", []) => {
if let Some(("map", [recv, map_arg], _)) = method_call(recv) {
map_flatten::check(cx, expr, recv, map_arg);
}
(name @ "flatten", args @ []) => match method_call(recv) {
Some(("map", [recv, map_arg], _)) => map_flatten::check(cx, expr, recv, map_arg),
Some(("cloned", [recv2], _)) => iter_overeager_cloned::check(cx, expr, recv2, name, args),
_ => {},
},
("fold", [init, acc]) => unnecessary_fold::check(cx, expr, init, acc, span),
("for_each", [_]) => {
@ -2281,6 +2319,13 @@ fn check_methods<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, msrv: Optio
("is_file", []) => filetype_is_file::check(cx, expr, recv),
("is_none", []) => check_is_some_is_none(cx, expr, recv, false),
("is_some", []) => check_is_some_is_none(cx, expr, recv, true),
("last", args @ []) | ("skip", args @ [_]) => {
if let Some((name2, [recv2, args2 @ ..], _span2)) = method_call(recv) {
if let ("cloned", []) = (name2, args2) {
iter_overeager_cloned::check(cx, expr, recv2, name, args);
}
}
},
("map", [m_arg]) => {
if let Some((name, [recv2, args @ ..], span2)) = method_call(recv) {
match (name, args) {
@ -2296,20 +2341,22 @@ fn check_methods<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, msrv: Optio
map_identity::check(cx, expr, recv, m_arg, span);
},
("map_or", [def, map]) => option_map_or_none::check(cx, expr, recv, def, map),
("next", []) => {
if let Some((name, [recv, args @ ..], _)) = method_call(recv) {
match (name, args) {
("filter", [arg]) => filter_next::check(cx, expr, recv, arg),
("filter_map", [arg]) => filter_map_next::check(cx, expr, recv, arg, msrv),
("iter", []) => iter_next_slice::check(cx, expr, recv),
("skip", [arg]) => iter_skip_next::check(cx, expr, recv, arg),
(name @ "next", args @ []) => {
if let Some((name2, [recv2, args2 @ ..], _)) = method_call(recv) {
match (name2, args2) {
("cloned", []) => iter_overeager_cloned::check(cx, expr, recv2, name, args),
("filter", [arg]) => filter_next::check(cx, expr, recv2, arg),
("filter_map", [arg]) => filter_map_next::check(cx, expr, recv2, arg, msrv),
("iter", []) => iter_next_slice::check(cx, expr, recv2),
("skip", [arg]) => iter_skip_next::check(cx, expr, recv2, arg),
("skip_while", [_]) => skip_while_next::check(cx, expr),
_ => {},
}
}
},
("nth", [n_arg]) => match method_call(recv) {
("nth", args @ [n_arg]) => match method_call(recv) {
Some(("bytes", [recv2], _)) => bytes_nth::check(cx, expr, recv2, n_arg),
Some(("cloned", [recv2], _)) => iter_overeager_cloned::check(cx, expr, recv2, name, args),
Some(("iter", [recv2], _)) => iter_nth::check(cx, expr, recv2, recv, n_arg, false),
Some(("iter_mut", [recv2], _)) => iter_nth::check(cx, expr, recv2, recv, n_arg, true),
_ => iter_nth_zero::check(cx, expr, recv, n_arg),
@ -2337,6 +2384,13 @@ fn check_methods<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, msrv: Optio
}
},
("step_by", [arg]) => iterator_step_by_zero::check(cx, expr, arg),
("take", args @ [_arg]) => {
if let Some((name2, [recv2, args2 @ ..], _span2)) = method_call(recv) {
if let ("cloned", []) = (name2, args2) {
iter_overeager_cloned::check(cx, expr, recv2, name, args);
}
}
},
("to_os_string" | "to_owned" | "to_path_buf" | "to_vec", []) => {
implicit_clone::check(cx, name, expr, recv);
},

26
clippy_lints/src/methods/or_fun_call.rs
View file

@ -4,6 +4,7 @@ use clippy_utils::source::{snippet, snippet_with_applicability, snippet_with_mac
use clippy_utils::ty::{implements_trait, match_type};
use clippy_utils::{contains_return, is_trait_item, last_path_segment, paths};
use if_chain::if_chain;
use rustc_errors::emitter::MAX_SUGGESTION_HIGHLIGHT_LINES;
use rustc_errors::Applicability;
use rustc_hir as hir;
use rustc_lint::LateContext;
@ -23,6 +24,7 @@ pub(super) fn check<'tcx>(
args: &'tcx [hir::Expr<'_>],
) {
/// Checks for `unwrap_or(T::new())` or `unwrap_or(T::default())`.
#[allow(clippy::too_many_arguments)]
fn check_unwrap_or_default(
cx: &LateContext<'_>,
name: &str,
@ -31,6 +33,7 @@ pub(super) fn check<'tcx>(
arg: &hir::Expr<'_>,
or_has_args: bool,
span: Span,
method_span: Span,
) -> bool {
let is_default_default = || is_trait_item(cx, fun, sym::Default);
@ -52,16 +55,27 @@ pub(super) fn check<'tcx>(
then {
let mut applicability = Applicability::MachineApplicable;
let hint = "unwrap_or_default()";
let mut sugg_span = span;
let mut sugg: String = format!(
"{}.{}",
snippet_with_applicability(cx, self_expr.span, "..", &mut applicability),
hint
);
if sugg.lines().count() > MAX_SUGGESTION_HIGHLIGHT_LINES {
sugg_span = method_span.with_hi(span.hi());
sugg = hint.to_string();
}
span_lint_and_sugg(
cx,
OR_FUN_CALL,
span,
sugg_span,
&format!("use of `{}` followed by a call to `{}`", name, path),
"try this",
format!(
"{}.unwrap_or_default()",
snippet_with_applicability(cx, self_expr.span, "..", &mut applicability)
),
sugg,
applicability,
);
@ -164,7 +178,7 @@ pub(super) fn check<'tcx>(
match inner_arg.kind {
hir::ExprKind::Call(fun, or_args) => {
let or_has_args = !or_args.is_empty();
if !check_unwrap_or_default(cx, name, fun, self_arg, arg, or_has_args, expr.span) {
if !check_unwrap_or_default(cx, name, fun, self_arg, arg, or_has_args, expr.span, method_span) {
let fun_span = if or_has_args { None } else { Some(fun.span) };
check_general_case(cx, name, method_span, self_arg, arg, expr.span, fun_span);
}

23
clippy_lints/src/misc.rs
View file

@ -548,6 +548,7 @@ fn is_array(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool {
matches!(&cx.typeck_results().expr_ty(expr).peel_refs().kind(), ty::Array(_, _))
}
#[allow(clippy::too_many_lines)]
fn check_to_owned(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>, left: bool) {
#[derive(Default)]
struct EqImpl {
@ -644,10 +645,26 @@ fn check_to_owned(cx: &LateContext<'_>, expr: &Expr<'_>, other: &Expr<'_>, left:
hint = expr_snip;
} else {
span = expr.span.to(other.span);
if eq_impl.ty_eq_other {
hint = format!("{} == {}", expr_snip, snippet(cx, other.span, ".."));
let cmp_span = if other.span < expr.span {
other.span.between(expr.span)
} else {
hint = format!("{} == {}", snippet(cx, other.span, ".."), expr_snip);
expr.span.between(other.span)
};
if eq_impl.ty_eq_other {
hint = format!(
"{}{}{}",
expr_snip,
snippet(cx, cmp_span, ".."),
snippet(cx, other.span, "..")
);
} else {
hint = format!(
"{}{}{}",
snippet(cx, other.span, ".."),
snippet(cx, cmp_span, ".."),
expr_snip
);
}
}

23
clippy_lints/src/needless_question_mark.rs
View file

@ -4,7 +4,7 @@ use clippy_utils::source::snippet;
use if_chain::if_chain;
use rustc_errors::Applicability;
use rustc_hir::LangItem::{OptionSome, ResultOk};
use rustc_hir::{Body, Expr, ExprKind, LangItem, MatchSource, QPath};
use rustc_hir::{AsyncGeneratorKind, Block, Body, Expr, ExprKind, GeneratorKind, LangItem, MatchSource, QPath};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::ty::TyS;
use rustc_session::{declare_lint_pass, declare_tool_lint};
@ -88,7 +88,26 @@ impl LateLintPass<'_> for NeedlessQuestionMark {
}
fn check_body(&mut self, cx: &LateContext<'_>, body: &'_ Body<'_>) {
check(cx, body.value.peel_blocks());
if let Some(GeneratorKind::Async(AsyncGeneratorKind::Fn)) = body.generator_kind {
if let ExprKind::Block(
Block {
expr:
Some(Expr {
kind: ExprKind::DropTemps(async_body),
..
}),
..
},
_,
) = body.value.kind
{
if let ExprKind::Block(Block { expr: Some(expr), .. }, ..) = async_body.kind {
check(cx, expr);
}
}
} else {
check(cx, body.value.peel_blocks());
}
}
}

2
clippy_lints/src/octal_escapes.rs
View file

@ -101,7 +101,7 @@ fn check_lit(cx: &EarlyContext<'_>, lit: &Lit, span: Span, is_string: bool) {
// construct a replacement escape
// the maximum value is \077, or \x3f, so u8 is sufficient here
if let Ok(n) = u8::from_str_radix(&contents[from + 1..to], 8) {
write!(&mut suggest_1, "\\x{:02x}", n).unwrap();
write!(suggest_1, "\\x{:02x}", n).unwrap();
}
// append the null byte as \x00 and the following digits literally

631
clippy_lints/src/ptr.rs
View file

@ -1,30 +1,36 @@
//! Checks for usage of `&Vec[_]` and `&String`.
use clippy_utils::diagnostics::{span_lint, span_lint_and_sugg, span_lint_and_then};
use clippy_utils::ptr::get_spans;
use clippy_utils::source::snippet_opt;
use clippy_utils::ty::walk_ptrs_hir_ty;
use clippy_utils::{expr_path_res, is_lint_allowed, match_any_diagnostic_items, paths};
use clippy_utils::ty::expr_sig;
use clippy_utils::{
expr_path_res, get_expr_use_or_unification_node, is_lint_allowed, match_any_diagnostic_items, path_to_local, paths,
};
use if_chain::if_chain;
use rustc_errors::Applicability;
use rustc_hir::def::Res;
use rustc_hir::def_id::DefId;
use rustc_hir::hir_id::HirIdMap;
use rustc_hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
use rustc_hir::{
BinOpKind, BodyId, Expr, ExprKind, FnDecl, FnRetTy, GenericArg, Impl, ImplItem, ImplItemKind, Item, ItemKind,
Lifetime, MutTy, Mutability, Node, PathSegment, QPath, TraitFn, TraitItem, TraitItemKind, Ty, TyKind,
self as hir, AnonConst, BinOpKind, BindingAnnotation, Body, Expr, ExprKind, FnDecl, FnRetTy, GenericArg,
ImplItemKind, ItemKind, Lifetime, LifetimeName, Mutability, Node, Param, ParamName, PatKind, QPath, TraitFn,
TraitItem, TraitItemKind, TyKind,
};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::hir::map::Map;
use rustc_middle::ty::{self, AssocItems, AssocKind, Ty};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::source_map::Span;
use rustc_span::symbol::Symbol;
use rustc_span::{sym, MultiSpan};
use std::borrow::Cow;
use std::fmt;
use std::iter;
declare_clippy_lint! {
/// ### What it does
/// This lint checks for function arguments of type `&String`
/// or `&Vec` unless the references are mutable. It will also suggest you
/// replace `.clone()` calls with the appropriate `.to_owned()`/`to_string()`
/// calls.
/// This lint checks for function arguments of type `&String`, `&Vec`,
/// `&PathBuf`, and `Cow<_>`. It will also suggest you replace `.clone()` calls
/// with the appropriate `.to_owned()`/`to_string()` calls.
///
/// ### Why is this bad?
/// Requiring the argument to be of the specific size
@ -32,28 +38,7 @@ declare_clippy_lint! {
/// or `&str` usually suffice and can be obtained from other types, too.
///
/// ### Known problems
/// The lint does not follow data. So if you have an
/// argument `x` and write `let y = x; y.clone()` the lint will not suggest
/// changing that `.clone()` to `.to_owned()`.
///
/// Other functions called from this function taking a `&String` or `&Vec`
/// argument may also fail to compile if you change the argument. Applying
/// this lint on them will fix the problem, but they may be in other crates.
///
/// One notable example of a function that may cause issues, and which cannot
/// easily be changed due to being in the standard library is `Vec::contains`.
/// when called on a `Vec<Vec<T>>`. If a `&Vec` is passed to that method then
/// it will compile, but if a `&[T]` is passed then it will not compile.
///
/// ```ignore
/// fn cannot_take_a_slice(v: &Vec<u8>) -> bool {
/// let vec_of_vecs: Vec<Vec<u8>> = some_other_fn();
///
/// vec_of_vecs.contains(v)
/// }
/// ```
///
/// Also there may be `fn(&Vec)`-typed references pointing to your function.
/// There may be `fn(&Vec)`-typed references pointing to your function.
/// If you have them, you will get a compiler error after applying this lint's
/// suggestions. You then have the choice to undo your changes or change the
/// type of the reference.
@ -155,32 +140,86 @@ declare_clippy_lint! {
declare_lint_pass!(Ptr => [PTR_ARG, CMP_NULL, MUT_FROM_REF, INVALID_NULL_PTR_USAGE]);
impl<'tcx> LateLintPass<'tcx> for Ptr {
fn check_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'_>) {
if let ItemKind::Fn(ref sig, _, body_id) = item.kind {
check_fn(cx, sig.decl, Some(body_id));
}
}
fn check_impl_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx ImplItem<'_>) {
if let ImplItemKind::Fn(ref sig, body_id) = item.kind {
let parent_item = cx.tcx.hir().get_parent_item(item.hir_id());
if let Some(Node::Item(it)) = cx.tcx.hir().find(parent_item) {
if let ItemKind::Impl(Impl { of_trait: Some(_), .. }) = it.kind {
return; // ignore trait impls
}
}
check_fn(cx, sig.decl, Some(body_id));
}
}
fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'_>) {
if let TraitItemKind::Fn(ref sig, ref trait_method) = item.kind {
let body_id = if let TraitFn::Provided(b) = *trait_method {
Some(b)
} else {
None
};
check_fn(cx, sig.decl, body_id);
if let TraitItemKind::Fn(sig, trait_method) = &item.kind {
if matches!(trait_method, TraitFn::Provided(_)) {
// Handled by check body.
return;
}
check_mut_from_ref(cx, sig.decl);
for arg in check_fn_args(
cx,
cx.tcx.fn_sig(item.def_id).skip_binder().inputs(),
sig.decl.inputs,
&[],
) {
span_lint_and_sugg(
cx,
PTR_ARG,
arg.span,
&arg.build_msg(),
"change this to",
format!("{}{}", arg.ref_prefix, arg.deref_ty.display(cx)),
Applicability::Unspecified,
);
}
}
}
fn check_body(&mut self, cx: &LateContext<'tcx>, body: &'tcx Body<'_>) {
let hir = cx.tcx.hir();
let mut parents = hir.parent_iter(body.value.hir_id);
let (item_id, decl) = match parents.next() {
Some((_, Node::Item(i))) => {
if let ItemKind::Fn(sig, ..) = &i.kind {
(i.def_id, sig.decl)
} else {
return;
}
},
Some((_, Node::ImplItem(i))) => {
if !matches!(parents.next(),
Some((_, Node::Item(i))) if matches!(&i.kind, ItemKind::Impl(i) if i.of_trait.is_none())
) {
return;
}
if let ImplItemKind::Fn(sig, _) = &i.kind {
(i.def_id, sig.decl)
} else {
return;
}
},
Some((_, Node::TraitItem(i))) => {
if let TraitItemKind::Fn(sig, _) = &i.kind {
(i.def_id, sig.decl)
} else {
return;
}
},
_ => return,
};
check_mut_from_ref(cx, decl);
let sig = cx.tcx.fn_sig(item_id).skip_binder();
let lint_args: Vec<_> = check_fn_args(cx, sig.inputs(), decl.inputs, body.params).collect();
let results = check_ptr_arg_usage(cx, body, &lint_args);
for (result, args) in results.iter().zip(lint_args.iter()).filter(|(r, _)| !r.skip) {
span_lint_and_then(cx, PTR_ARG, args.span, &args.build_msg(), |diag| {
diag.multipart_suggestion(
"change this to",
iter::once((args.span, format!("{}{}", args.ref_prefix, args.deref_ty.display(cx))))
.chain(result.replacements.iter().map(|r| {
(
r.expr_span,
format!("{}{}", snippet_opt(cx, r.self_span).unwrap(), r.replacement),
)
}))
.collect(),
Applicability::Unspecified,
);
});
}
}
@ -247,154 +286,206 @@ fn check_invalid_ptr_usage<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) {
}
}
#[allow(clippy::too_many_lines)]
fn check_fn(cx: &LateContext<'_>, decl: &FnDecl<'_>, opt_body_id: Option<BodyId>) {
let body = opt_body_id.map(|id| cx.tcx.hir().body(id));
#[derive(Default)]
struct PtrArgResult {
skip: bool,
replacements: Vec<PtrArgReplacement>,
}
for (idx, arg) in decl.inputs.iter().enumerate() {
// Honor the allow attribute on parameters. See issue 5644.
if let Some(body) = &body {
if is_lint_allowed(cx, PTR_ARG, body.params[idx].hir_id) {
continue;
}
struct PtrArgReplacement {
expr_span: Span,
self_span: Span,
replacement: &'static str,
}
struct PtrArg<'tcx> {
idx: usize,
span: Span,
ty_did: DefId,
ty_name: Symbol,
method_renames: &'static [(&'static str, &'static str)],
ref_prefix: RefPrefix,
deref_ty: DerefTy<'tcx>,
deref_assoc_items: Option<(DefId, &'tcx AssocItems<'tcx>)>,
}
impl PtrArg<'_> {
fn build_msg(&self) -> String {
format!(
"writing `&{}{}` instead of `&{}{}` involves a new object where a slice will do",
self.ref_prefix.mutability.prefix_str(),
self.ty_name,
self.ref_prefix.mutability.prefix_str(),
self.deref_ty.argless_str(),
)
}
}
struct RefPrefix {
lt: LifetimeName,
mutability: Mutability,
}
impl fmt::Display for RefPrefix {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use fmt::Write;
f.write_char('&')?;
match self.lt {
LifetimeName::Param(ParamName::Plain(name)) => {
name.fmt(f)?;
f.write_char(' ')?;
},
LifetimeName::Underscore => f.write_str("'_ ")?,
LifetimeName::Static => f.write_str("'static ")?,
_ => (),
}
f.write_str(self.mutability.prefix_str())
}
}
let (item_name, path) = if_chain! {
if let TyKind::Rptr(_, MutTy { ty, mutbl: Mutability::Not }) = arg.kind;
if let TyKind::Path(QPath::Resolved(_, path)) = ty.kind;
if let Res::Def(_, did) = path.res;
if let Some(item_name) = cx.tcx.get_diagnostic_name(did);
then {
(item_name, path)
} else {
continue
}
};
struct DerefTyDisplay<'a, 'tcx>(&'a LateContext<'tcx>, &'a DerefTy<'tcx>);
impl fmt::Display for DerefTyDisplay<'_, '_> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use std::fmt::Write;
match self.1 {
DerefTy::Str => f.write_str("str"),
DerefTy::Path => f.write_str("Path"),
DerefTy::Slice(hir_ty, ty) => {
f.write_char('[')?;
match hir_ty.and_then(|s| snippet_opt(self.0, s)) {
Some(s) => f.write_str(&s)?,
None => ty.fmt(f)?,
}
f.write_char(']')
},
}
}
}
match item_name {
sym::Vec => {
if let Some(spans) = get_spans(cx, opt_body_id, idx, &[("clone", ".to_owned()")]) {
span_lint_and_then(
cx,
PTR_ARG,
arg.span,
"writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used \
with non-Vec-based slices",
|diag| {
if let Some(ref snippet) = get_only_generic_arg_snippet(cx, arg) {
diag.span_suggestion(
arg.span,
"change this to",
format!("&[{}]", snippet),
Applicability::Unspecified,
);
}
for (clonespan, suggestion) in spans {
diag.span_suggestion(
clonespan,
&snippet_opt(cx, clonespan).map_or("change the call to".into(), |x| {
Cow::Owned(format!("change `{}` to", x))
}),
suggestion.into(),
Applicability::Unspecified,
);
}
},
);
}
},
sym::String => {
if let Some(spans) = get_spans(cx, opt_body_id, idx, &[("clone", ".to_string()"), ("as_str", "")]) {
span_lint_and_then(
cx,
PTR_ARG,
arg.span,
"writing `&String` instead of `&str` involves a new object where a slice will do",
|diag| {
diag.span_suggestion(arg.span, "change this to", "&str".into(), Applicability::Unspecified);
for (clonespan, suggestion) in spans {
diag.span_suggestion_short(
clonespan,
&snippet_opt(cx, clonespan).map_or("change the call to".into(), |x| {
Cow::Owned(format!("change `{}` to", x))
}),
suggestion.into(),
Applicability::Unspecified,
);
}
},
);
}
},
sym::PathBuf => {
if let Some(spans) = get_spans(cx, opt_body_id, idx, &[("clone", ".to_path_buf()"), ("as_path", "")]) {
span_lint_and_then(
cx,
PTR_ARG,
arg.span,
"writing `&PathBuf` instead of `&Path` involves a new object where a slice will do",
|diag| {
diag.span_suggestion(
arg.span,
"change this to",
"&Path".into(),
Applicability::Unspecified,
);
for (clonespan, suggestion) in spans {
diag.span_suggestion_short(
clonespan,
&snippet_opt(cx, clonespan).map_or("change the call to".into(), |x| {
Cow::Owned(format!("change `{}` to", x))
}),
suggestion.into(),
Applicability::Unspecified,
);
}
},
);
}
},
sym::Cow => {
if_chain! {
if let [ref bx] = *path.segments;
if let Some(params) = bx.args;
if !params.parenthesized;
if let Some(inner) = params.args.iter().find_map(|arg| match arg {
GenericArg::Type(ty) => Some(ty),
_ => None,
});
let replacement = snippet_opt(cx, inner.span);
if let Some(r) = replacement;
then {
span_lint_and_sugg(
cx,
PTR_ARG,
arg.span,
"using a reference to `Cow` is not recommended",
"change this to",
"&".to_owned() + &r,
Applicability::Unspecified,
);
}
}
},
_ => {},
enum DerefTy<'tcx> {
Str,
Path,
Slice(Option<Span>, Ty<'tcx>),
}
impl<'tcx> DerefTy<'tcx> {
fn argless_str(&self) -> &'static str {
match *self {
Self::Str => "str",
Self::Path => "Path",
Self::Slice(..) => "[_]",
}
}
fn display<'a>(&'a self, cx: &'a LateContext<'tcx>) -> DerefTyDisplay<'a, 'tcx> {
DerefTyDisplay(cx, self)
}
}
fn check_fn_args<'cx, 'tcx: 'cx>(
cx: &'cx LateContext<'tcx>,
tys: &'tcx [Ty<'_>],
hir_tys: &'tcx [hir::Ty<'_>],
params: &'tcx [Param<'_>],
) -> impl Iterator<Item = PtrArg<'tcx>> + 'cx {
tys.iter()
.zip(hir_tys.iter())
.enumerate()
.filter_map(|(i, (ty, hir_ty))| {
if_chain! {
if let ty::Ref(_, ty, mutability) = *ty.kind();
if let ty::Adt(adt, substs) = *ty.kind();
if let TyKind::Rptr(lt, ref ty) = hir_ty.kind;
if let TyKind::Path(QPath::Resolved(None, path)) = ty.ty.kind;
// Check that the name as typed matches the actual name of the type.
// e.g. `fn foo(_: &Foo)` shouldn't trigger the lint when `Foo` is an alias for `Vec`
if let [.., name] = path.segments;
if cx.tcx.item_name(adt.did) == name.ident.name;
if !is_lint_allowed(cx, PTR_ARG, hir_ty.hir_id);
if params.get(i).map_or(true, |p| !is_lint_allowed(cx, PTR_ARG, p.hir_id));
then {
let (method_renames, deref_ty, deref_impl_id) = match cx.tcx.get_diagnostic_name(adt.did) {
Some(sym::Vec) => (
[("clone", ".to_owned()")].as_slice(),
DerefTy::Slice(
name.args
.and_then(|args| args.args.first())
.and_then(|arg| if let GenericArg::Type(ty) = arg {
Some(ty.span)
} else {
None
}),
substs.type_at(0),
),
cx.tcx.lang_items().slice_impl()
),
Some(sym::String) => (
[("clone", ".to_owned()"), ("as_str", "")].as_slice(),
DerefTy::Str,
cx.tcx.lang_items().str_impl()
),
Some(sym::PathBuf) => (
[("clone", ".to_path_buf()"), ("as_path", "")].as_slice(),
DerefTy::Path,
None,
),
Some(sym::Cow) => {
let ty_name = name.args
.and_then(|args| {
args.args.iter().find_map(|a| match a {
GenericArg::Type(x) => Some(x),
_ => None,
})
})
.and_then(|arg| snippet_opt(cx, arg.span))
.unwrap_or_else(|| substs.type_at(1).to_string());
span_lint_and_sugg(
cx,
PTR_ARG,
hir_ty.span,
"using a reference to `Cow` is not recommended",
"change this to",
format!("&{}{}", mutability.prefix_str(), ty_name),
Applicability::Unspecified,
);
return None;
},
_ => return None,
};
return Some(PtrArg {
idx: i,
span: hir_ty.span,
ty_did: adt.did,
ty_name: name.ident.name,
method_renames,
ref_prefix: RefPrefix {
lt: lt.name,
mutability,
},
deref_ty,
deref_assoc_items: deref_impl_id.map(|id| (id, cx.tcx.associated_items(id))),
});
}
}
None
})
}
fn check_mut_from_ref(cx: &LateContext<'_>, decl: &FnDecl<'_>) {
if let FnRetTy::Return(ty) = decl.output {
if let Some((out, Mutability::Mut, _)) = get_rptr_lm(ty) {
let mut immutables = vec![];
for (_, ref mutbl, ref argspan) in decl
for (_, mutbl, argspan) in decl
.inputs
.iter()
.filter_map(get_rptr_lm)
.filter(|&(lt, _, _)| lt.name == out.name)
{
if *mutbl == Mutability::Mut {
if mutbl == Mutability::Mut {
return;
}
immutables.push(*argspan);
immutables.push(argspan);
}
if immutables.is_empty() {
return;
@ -413,24 +504,158 @@ fn check_fn(cx: &LateContext<'_>, decl: &FnDecl<'_>, opt_body_id: Option<BodyId>
}
}
fn get_only_generic_arg_snippet(cx: &LateContext<'_>, arg: &Ty<'_>) -> Option<String> {
if_chain! {
if let TyKind::Path(QPath::Resolved(_, path)) = walk_ptrs_hir_ty(arg).kind;
if let Some(&PathSegment{args: Some(parameters), ..}) = path.segments.last();
let types: Vec<_> = parameters.args.iter().filter_map(|arg| match arg {
GenericArg::Type(ty) => Some(ty),
_ => None,
}).collect();
if types.len() == 1;
then {
snippet_opt(cx, types[0].span)
} else {
None
#[allow(clippy::too_many_lines)]
fn check_ptr_arg_usage<'tcx>(cx: &LateContext<'tcx>, body: &'tcx Body<'_>, args: &[PtrArg<'tcx>]) -> Vec<PtrArgResult> {
struct V<'cx, 'tcx> {
cx: &'cx LateContext<'tcx>,
/// Map from a local id to which argument it came from (index into `Self::args` and
/// `Self::results`)
bindings: HirIdMap<usize>,
/// The arguments being checked.
args: &'cx [PtrArg<'tcx>],
/// The results for each argument (len should match args.len)
results: Vec<PtrArgResult>,
/// The number of arguments which can't be linted. Used to return early.
skip_count: usize,
}
impl<'tcx> Visitor<'tcx> for V<'_, 'tcx> {
type Map = Map<'tcx>;
fn nested_visit_map(&mut self) -> NestedVisitorMap<Self::Map> {
NestedVisitorMap::OnlyBodies(self.cx.tcx.hir())
}
fn visit_anon_const(&mut self, _: &'tcx AnonConst) {}
fn visit_expr(&mut self, e: &'tcx Expr<'_>) {
if self.skip_count == self.args.len() {
return;
}
// Check if this is local we care about
let args_idx = match path_to_local(e).and_then(|id| self.bindings.get(&id)) {
Some(&i) => i,
None => return walk_expr(self, e),
};
let args = &self.args[args_idx];
let result = &mut self.results[args_idx];
// Helper function to handle early returns.
let mut set_skip_flag = || {
if result.skip {
self.skip_count += 1;
}
result.skip = true;
};
match get_expr_use_or_unification_node(self.cx.tcx, e) {
Some((Node::Stmt(_), _)) => (),
Some((Node::Local(l), _)) => {
// Only trace simple bindings. e.g `let x = y;`
if let PatKind::Binding(BindingAnnotation::Unannotated, id, _, None) = l.pat.kind {
self.bindings.insert(id, args_idx);
} else {
set_skip_flag();
}
},
Some((Node::Expr(e), child_id)) => match e.kind {
ExprKind::Call(f, expr_args) => {
let i = expr_args.iter().position(|arg| arg.hir_id == child_id).unwrap_or(0);
if expr_sig(self.cx, f)
.map(|sig| sig.input(i).skip_binder().peel_refs())
.map_or(true, |ty| match *ty.kind() {
ty::Param(_) => true,
ty::Adt(def, _) => def.did == args.ty_did,
_ => false,
})
{
// Passed to a function taking the non-dereferenced type.
set_skip_flag();
}
},
ExprKind::MethodCall(name, _, expr_args @ [self_arg, ..], _) => {
let i = expr_args.iter().position(|arg| arg.hir_id == child_id).unwrap_or(0);
if i == 0 {
// Check if the method can be renamed.
let name = name.ident.as_str();
if let Some((_, replacement)) = args.method_renames.iter().find(|&&(x, _)| x == name) {
result.replacements.push(PtrArgReplacement {
expr_span: e.span,
self_span: self_arg.span,
replacement,
});
return;
}
}
let id = if let Some(x) = self.cx.typeck_results().type_dependent_def_id(e.hir_id) {
x
} else {
set_skip_flag();
return;
};
match *self.cx.tcx.fn_sig(id).skip_binder().inputs()[i].peel_refs().kind() {
ty::Param(_) => {
set_skip_flag();
},
// If the types match check for methods which exist on both types. e.g. `Vec::len` and
// `slice::len`
ty::Adt(def, _)
if def.did == args.ty_did
&& (i != 0
|| self.cx.tcx.trait_of_item(id).is_some()
|| !args.deref_assoc_items.map_or(false, |(id, items)| {
items
.find_by_name_and_kind(self.cx.tcx, name.ident, AssocKind::Fn, id)
.is_some()
})) =>
{
set_skip_flag();
},
_ => (),
}
},
// Indexing is fine for currently supported types.
ExprKind::Index(e, _) if e.hir_id == child_id => (),
_ => set_skip_flag(),
},
_ => set_skip_flag(),
}
}
}
let mut skip_count = 0;
let mut results = args.iter().map(|_| PtrArgResult::default()).collect::<Vec<_>>();
let mut v = V {
cx,
bindings: args
.iter()
.enumerate()
.filter_map(|(i, arg)| {
let param = &body.params[arg.idx];
match param.pat.kind {
PatKind::Binding(BindingAnnotation::Unannotated, id, _, None)
if !is_lint_allowed(cx, PTR_ARG, param.hir_id) =>
{
Some((id, i))
},
_ => {
skip_count += 1;
results[arg.idx].skip = true;
None
},
}
})
.collect(),
args,
results,
skip_count,
};
v.visit_expr(&body.value);
v.results
}
fn get_rptr_lm<'tcx>(ty: &'tcx Ty<'tcx>) -> Option<(&'tcx Lifetime, Mutability, Span)> {
fn get_rptr_lm<'tcx>(ty: &'tcx hir::Ty<'tcx>) -> Option<(&'tcx Lifetime, Mutability, Span)> {
if let TyKind::Rptr(ref lt, ref m) = ty.kind {
Some((lt, m.mutbl, ty.span))
} else {

57
clippy_lints/src/reference.rs
View file

@ -1,6 +1,5 @@
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::source::{snippet_opt, snippet_with_applicability};
use clippy_utils::sugg::Sugg;
use if_chain::if_chain;
use rustc_ast::ast::{Expr, ExprKind, Mutability, UnOp};
use rustc_errors::Applicability;
@ -104,59 +103,3 @@ impl EarlyLintPass for DerefAddrOf {
}
}
}
declare_clippy_lint! {
/// ### What it does
/// Checks for references in expressions that use
/// auto dereference.
///
/// ### Why is this bad?
/// The reference is a no-op and is automatically
/// dereferenced by the compiler and makes the code less clear.
///
/// ### Example
/// ```rust
/// struct Point(u32, u32);
/// let point = Point(30, 20);
/// let x = (&point).0;
/// ```
/// Use instead:
/// ```rust
/// # struct Point(u32, u32);
/// # let point = Point(30, 20);
/// let x = point.0;
/// ```
#[clippy::version = "pre 1.29.0"]
pub REF_IN_DEREF,
complexity,
"Use of reference in auto dereference expression."
}
declare_lint_pass!(RefInDeref => [REF_IN_DEREF]);
impl EarlyLintPass for RefInDeref {
fn check_expr(&mut self, cx: &EarlyContext<'_>, e: &Expr) {
if_chain! {
if let ExprKind::Field(ref object, _) = e.kind;
if let ExprKind::Paren(ref parened) = object.kind;
if let ExprKind::AddrOf(_, _, ref inner) = parened.kind;
then {
let applicability = if inner.span.from_expansion() {
Applicability::MaybeIncorrect
} else {
Applicability::MachineApplicable
};
let sugg = Sugg::ast(cx, inner, "_").maybe_par();
span_lint_and_sugg(
cx,
REF_IN_DEREF,
object.span,
"creating a reference that is immediately dereferenced",
"try this",
sugg.to_string(),
applicability,
);
}
}
}
}

2
clippy_lints/src/return_self_not_must_use.rs
View file

@ -60,7 +60,7 @@ declare_clippy_lint! {
/// ```
#[clippy::version = "1.59.0"]
pub RETURN_SELF_NOT_MUST_USE,
suspicious,
pedantic,
"missing `#[must_use]` annotation on a method returning `Self`"
}

58
clippy_lints/src/trait_bounds.rs
View file

@ -3,7 +3,7 @@ use clippy_utils::source::{snippet, snippet_with_applicability};
use clippy_utils::{SpanlessEq, SpanlessHash};
use core::hash::{Hash, Hasher};
use if_chain::if_chain;
use rustc_data_structures::fx::{FxHashMap, FxHashSet};
use rustc_data_structures::fx::FxHashMap;
use rustc_data_structures::unhash::UnhashMap;
use rustc_errors::Applicability;
use rustc_hir::def::Res;
@ -91,7 +91,7 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds {
fn check_trait_item(&mut self, cx: &LateContext<'tcx>, item: &'tcx TraitItem<'tcx>) {
let Generics { where_clause, .. } = &item.generics;
let mut self_bounds_set = FxHashSet::default();
let mut self_bounds_map = FxHashMap::default();
for predicate in where_clause.predicates {
if_chain! {
@ -108,27 +108,29 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds {
)
) = cx.tcx.hir().get_if_local(*def_id);
then {
if self_bounds_set.is_empty() {
if self_bounds_map.is_empty() {
for bound in self_bounds.iter() {
let Some((self_res, _)) = get_trait_res_span_from_bound(bound) else { continue };
self_bounds_set.insert(self_res);
let Some((self_res, self_segments, _)) = get_trait_info_from_bound(bound) else { continue };
self_bounds_map.insert(self_res, self_segments);
}
}
bound_predicate
.bounds
.iter()
.filter_map(get_trait_res_span_from_bound)
.for_each(|(trait_item_res, span)| {
if self_bounds_set.get(&trait_item_res).is_some() {
span_lint_and_help(
cx,
TRAIT_DUPLICATION_IN_BOUNDS,
span,
"this trait bound is already specified in trait declaration",
None,
"consider removing this trait bound",
);
.filter_map(get_trait_info_from_bound)
.for_each(|(trait_item_res, trait_item_segments, span)| {
if let Some(self_segments) = self_bounds_map.get(&trait_item_res) {
if SpanlessEq::new(cx).eq_path_segments(self_segments, trait_item_segments) {
span_lint_and_help(
cx,
TRAIT_DUPLICATION_IN_BOUNDS,
span,
"this trait bound is already specified in trait declaration",
None,
"consider removing this trait bound",
);
}
}
});
}
@ -137,14 +139,6 @@ impl<'tcx> LateLintPass<'tcx> for TraitBounds {
}
}
fn get_trait_res_span_from_bound(bound: &GenericBound<'_>) -> Option<(Res, Span)> {
if let GenericBound::Trait(t, _) = bound {
Some((t.trait_ref.path.res, t.span))
} else {
None
}
}
impl TraitBounds {
fn check_type_repetition<'tcx>(self, cx: &LateContext<'tcx>, gen: &'tcx Generics<'_>) {
struct SpanlessTy<'cx, 'tcx> {
@ -231,7 +225,7 @@ fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
let res = param
.bounds
.iter()
.filter_map(get_trait_res_span_from_bound)
.filter_map(get_trait_info_from_bound)
.collect::<Vec<_>>();
map.insert(*ident, res);
}
@ -245,10 +239,10 @@ fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
if let Some(segment) = segments.first();
if let Some(trait_resolutions_direct) = map.get(&segment.ident);
then {
for (res_where, _) in bound_predicate.bounds.iter().filter_map(get_trait_res_span_from_bound) {
if let Some((_, span_direct)) = trait_resolutions_direct
for (res_where, _, _) in bound_predicate.bounds.iter().filter_map(get_trait_info_from_bound) {
if let Some((_, _, span_direct)) = trait_resolutions_direct
.iter()
.find(|(res_direct, _)| *res_direct == res_where) {
.find(|(res_direct, _, _)| *res_direct == res_where) {
span_lint_and_help(
cx,
TRAIT_DUPLICATION_IN_BOUNDS,
@ -263,3 +257,11 @@ fn check_trait_bound_duplication(cx: &LateContext<'_>, gen: &'_ Generics<'_>) {
}
}
}
fn get_trait_info_from_bound<'a>(bound: &'a GenericBound<'_>) -> Option<(Res, &'a [PathSegment<'a>], Span)> {
if let GenericBound::Trait(t, _) = bound {
Some((t.trait_ref.path.res, t.trait_ref.path.segments, t.span))
} else {
None
}
}

4
clippy_lints/src/unnested_or_patterns.rs
View file

@ -291,7 +291,7 @@ fn transform_with_focus_on_idx(alternatives: &mut Vec<P<Pat>>, focus_idx: usize)
fn extend_with_struct_pat(
qself1: &Option<ast::QSelf>,
path1: &ast::Path,
fps1: &mut Vec<ast::PatField>,
fps1: &mut [ast::PatField],
rest1: bool,
start: usize,
alternatives: &mut Vec<P<Pat>>,
@ -332,7 +332,7 @@ fn extend_with_struct_pat(
/// while also requiring `ps1[..n] ~ ps2[..n]` (pre) and `ps1[n + 1..] ~ ps2[n + 1..]` (post),
/// where `~` denotes semantic equality.
fn extend_with_matching_product(
targets: &mut Vec<P<Pat>>,
targets: &mut [P<Pat>],
start: usize,
alternatives: &mut Vec<P<Pat>>,
predicate: impl Fn(&PatKind, &[P<Pat>], usize) -> bool,

2
clippy_lints/src/utils/conf.rs
View file

@ -156,7 +156,7 @@ define_Conf! {
///
/// Suppress lints whenever the suggested change would cause breakage for other crates.
(avoid_breaking_exported_api: bool = true),
/// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE.
/// Lint: MANUAL_SPLIT_ONCE, MANUAL_STR_REPEAT, CLONED_INSTEAD_OF_COPIED, REDUNDANT_FIELD_NAMES, REDUNDANT_STATIC_LIFETIMES, FILTER_MAP_NEXT, CHECKED_CONVERSIONS, MANUAL_RANGE_CONTAINS, USE_SELF, MEM_REPLACE_WITH_DEFAULT, MANUAL_NON_EXHAUSTIVE, OPTION_AS_REF_DEREF, MAP_UNWRAP_OR, MATCH_LIKE_MATCHES_MACRO, MANUAL_STRIP, MISSING_CONST_FOR_FN, UNNESTED_OR_PATTERNS, FROM_OVER_INTO, PTR_AS_PTR, IF_THEN_SOME_ELSE_NONE, APPROX_CONSTANT, DEPRECATED_CFG_ATTR, INDEX_REFUTABLE_SLICE, MAP_CLONE, BORROW_AS_PTR, MANUAL_BITS.
///
/// The minimum rust version that the project supports
(msrv: Option<String> = None),

32
clippy_utils/src/lib.rs
View file

@ -1850,7 +1850,8 @@ pub fn is_expr_identity_function(cx: &LateContext<'_>, expr: &Expr<'_>) -> bool
}
/// Gets the node where an expression is either used, or it's type is unified with another branch.
pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<Node<'tcx>> {
/// Returns both the node and the `HirId` of the closest child node.
pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>) -> Option<(Node<'tcx>, HirId)> {
let mut child_id = expr.hir_id;
let mut iter = tcx.hir().parent_iter(child_id);
loop {
@ -1862,9 +1863,9 @@ pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>
ExprKind::Match(_, [arm], _) if arm.hir_id == child_id => child_id = expr.hir_id,
ExprKind::Block(..) | ExprKind::DropTemps(_) => child_id = expr.hir_id,
ExprKind::If(_, then_expr, None) if then_expr.hir_id == child_id => break None,
_ => break Some(Node::Expr(expr)),
_ => break Some((Node::Expr(expr), child_id)),
},
Some((_, node)) => break Some(node),
Some((_, node)) => break Some((node, child_id)),
}
}
}
@ -1873,18 +1874,21 @@ pub fn get_expr_use_or_unification_node<'tcx>(tcx: TyCtxt<'tcx>, expr: &Expr<'_>
pub fn is_expr_used_or_unified(tcx: TyCtxt<'_>, expr: &Expr<'_>) -> bool {
!matches!(
get_expr_use_or_unification_node(tcx, expr),
None | Some(Node::Stmt(Stmt {
kind: StmtKind::Expr(_)
| StmtKind::Semi(_)
| StmtKind::Local(Local {
pat: Pat {
kind: PatKind::Wild,
None | Some((
Node::Stmt(Stmt {
kind: StmtKind::Expr(_)
| StmtKind::Semi(_)
| StmtKind::Local(Local {
pat: Pat {
kind: PatKind::Wild,
..
},
..
},
..
}),
..
}))
}),
..
}),
_
))
)
}

2
clippy_utils/src/sugg.rs
View file

@ -388,7 +388,7 @@ fn binop_to_string(op: AssocOp, lhs: &str, rhs: &str) -> String {
}
/// Return `true` if `sugg` is enclosed in parenthesis.
fn has_enclosing_paren(sugg: impl AsRef<str>) -> bool {
pub fn has_enclosing_paren(sugg: impl AsRef<str>) -> bool {
let mut chars = sugg.as_ref().chars();
if chars.next() == Some('(') {
let mut depth = 1;

113
clippy_utils/src/ty.rs
View file

@ -5,19 +5,22 @@
use rustc_ast::ast::Mutability;
use rustc_data_structures::fx::FxHashMap;
use rustc_hir as hir;
use rustc_hir::def::{CtorKind, DefKind, Res};
use rustc_hir::def_id::DefId;
use rustc_hir::{TyKind, Unsafety};
use rustc_hir::{Expr, TyKind, Unsafety};
use rustc_infer::infer::TyCtxtInferExt;
use rustc_lint::LateContext;
use rustc_middle::ty::subst::{GenericArg, GenericArgKind};
use rustc_middle::ty::{self, AdtDef, IntTy, Predicate, Ty, TyCtxt, TypeFoldable, UintTy};
use rustc_middle::ty::subst::{GenericArg, GenericArgKind, Subst};
use rustc_middle::ty::{
self, AdtDef, Binder, FnSig, IntTy, Predicate, PredicateKind, Ty, TyCtxt, TypeFoldable, UintTy,
};
use rustc_span::symbol::Ident;
use rustc_span::{sym, Span, Symbol, DUMMY_SP};
use rustc_trait_selection::infer::InferCtxtExt;
use rustc_trait_selection::traits::query::normalize::AtExt;
use std::iter;
use crate::{match_def_path, must_use_attr};
use crate::{expr_path_res, match_def_path, must_use_attr};
// Checks if the given type implements copy.
pub fn is_copy<'tcx>(cx: &LateContext<'tcx>, ty: Ty<'tcx>) -> bool {
@ -410,3 +413,105 @@ pub fn all_predicates_of(tcx: TyCtxt<'_>, id: DefId) -> impl Iterator<Item = &(P
})
.flatten()
}
/// A signature for a function like type.
#[derive(Clone, Copy)]
pub enum ExprFnSig<'tcx> {
Sig(Binder<'tcx, FnSig<'tcx>>),
Closure(Binder<'tcx, FnSig<'tcx>>),
Trait(Binder<'tcx, Ty<'tcx>>, Option<Binder<'tcx, Ty<'tcx>>>),
}
impl<'tcx> ExprFnSig<'tcx> {
/// Gets the argument type at the given offset.
pub fn input(self, i: usize) -> Binder<'tcx, Ty<'tcx>> {
match self {
Self::Sig(sig) => sig.input(i),
Self::Closure(sig) => sig.input(0).map_bound(|ty| ty.tuple_element_ty(i).unwrap()),
Self::Trait(inputs, _) => inputs.map_bound(|ty| ty.tuple_element_ty(i).unwrap()),
}
}
/// Gets the result type, if one could be found. Note that the result type of a trait may not be
/// specified.
pub fn output(self) -> Option<Binder<'tcx, Ty<'tcx>>> {
match self {
Self::Sig(sig) | Self::Closure(sig) => Some(sig.output()),
Self::Trait(_, output) => output,
}
}
}
/// If the expression is function like, get the signature for it.
pub fn expr_sig<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'_>) -> Option<ExprFnSig<'tcx>> {
if let Res::Def(DefKind::Fn | DefKind::Ctor(_, CtorKind::Fn) | DefKind::AssocFn, id) = expr_path_res(cx, expr) {
Some(ExprFnSig::Sig(cx.tcx.fn_sig(id)))
} else {
let ty = cx.typeck_results().expr_ty_adjusted(expr).peel_refs();
match *ty.kind() {
ty::Closure(_, subs) => Some(ExprFnSig::Closure(subs.as_closure().sig())),
ty::FnDef(id, subs) => Some(ExprFnSig::Sig(cx.tcx.fn_sig(id).subst(cx.tcx, subs))),
ty::FnPtr(sig) => Some(ExprFnSig::Sig(sig)),
ty::Dynamic(bounds, _) => {
let lang_items = cx.tcx.lang_items();
match bounds.principal() {
Some(bound)
if Some(bound.def_id()) == lang_items.fn_trait()
|| Some(bound.def_id()) == lang_items.fn_once_trait()
|| Some(bound.def_id()) == lang_items.fn_mut_trait() =>
{
let output = bounds
.projection_bounds()
.find(|p| lang_items.fn_once_output().map_or(false, |id| id == p.item_def_id()))
.map(|p| p.map_bound(|p| p.ty));
Some(ExprFnSig::Trait(bound.map_bound(|b| b.substs.type_at(0)), output))
},
_ => None,
}
},
ty::Param(_) | ty::Projection(..) => {
let mut inputs = None;
let mut output = None;
let lang_items = cx.tcx.lang_items();
for (pred, _) in all_predicates_of(cx.tcx, cx.typeck_results().hir_owner.to_def_id()) {
let mut is_input = false;
if let Some(ty) = pred
.kind()
.map_bound(|pred| match pred {
PredicateKind::Trait(p)
if (lang_items.fn_trait() == Some(p.def_id())
|| lang_items.fn_mut_trait() == Some(p.def_id())
|| lang_items.fn_once_trait() == Some(p.def_id()))
&& p.self_ty() == ty =>
{
is_input = true;
Some(p.trait_ref.substs.type_at(1))
},
PredicateKind::Projection(p)
if Some(p.projection_ty.item_def_id) == lang_items.fn_once_output()
&& p.projection_ty.self_ty() == ty =>
{
is_input = false;
Some(p.ty)
},
_ => None,
})
.transpose()
{
if is_input && inputs.is_none() {
inputs = Some(ty);
} else if !is_input && output.is_none() {
output = Some(ty);
} else {
// Multiple different fn trait impls. Is this even allowed?
return None;
}
}
}
inputs.map(|ty| ExprFnSig::Trait(ty, output))
},
_ => None,
}
}
}

2
rustc_tools_util/README.md
View file

@ -53,7 +53,7 @@ This gives the following output in clippy:
## License
Copyright 2014-2020 The Rust Project Developers
Copyright 2014-2022 The Rust Project Developers
Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
http://www.apache.org/licenses/LICENSE-2.0> or the MIT license

3
src/driver.rs
View file

@ -331,11 +331,10 @@ pub fn main() {
// - IF Clippy is run on the main crate, not on deps (`!cap_lints_allow`) THEN
// - IF `--no-deps` is not set (`!no_deps`) OR
// - IF `--no-deps` is set and Clippy is run on the specified primary package
let clippy_tests_set = env::var("__CLIPPY_INTERNAL_TESTS").map_or(false, |val| val == "true");
let cap_lints_allow = arg_value(&orig_args, "--cap-lints", |val| val == "allow").is_some();
let in_primary_package = env::var("CARGO_PRIMARY_PACKAGE").is_ok();
let clippy_enabled = clippy_tests_set || (!cap_lints_allow && (!no_deps || in_primary_package));
let clippy_enabled = !cap_lints_allow && (!no_deps || in_primary_package);
if clippy_enabled {
args.extend(clippy_args);
}

8
tests/compile-test.rs
View file

@ -328,15 +328,9 @@ fn run_ui_cargo(config: &mut compiletest::Config) {
}
}
fn prepare_env() {
set_var("CLIPPY_DISABLE_DOCS_LINKS", "true");
set_var("__CLIPPY_INTERNAL_TESTS", "true");
//set_var("RUST_BACKTRACE", "0");
}
#[test]
fn compile_test() {
prepare_env();
set_var("CLIPPY_DISABLE_DOCS_LINKS", "true");
let mut config = default_config();
run_ui(&mut config);
run_ui_test(&mut config);

24
tests/ui-toml/min_rust_version/min_rust_version.rs
View file

@ -1,6 +1,7 @@
#![allow(clippy::redundant_clone)]
#![warn(clippy::manual_non_exhaustive)]
#![allow(clippy::redundant_clone, clippy::unnecessary_operation)]
#![warn(clippy::manual_non_exhaustive, clippy::borrow_as_ptr, clippy::manual_bits)]
use std::mem::{size_of, size_of_val};
use std::ops::Deref;
mod enums {
@ -68,6 +69,24 @@ fn check_index_refutable_slice() {
}
}
fn map_clone_suggest_copied() {
// This should still trigger the lint but suggest `cloned()` instead of `copied()`
let _: Option<u64> = Some(&16).map(|b| *b);
}
fn borrow_as_ptr() {
let val = 1;
let _p = &val as *const i32;
let mut val_mut = 1;
let _p_mut = &mut val_mut as *mut i32;
}
fn manual_bits() {
size_of::<i8>() * 8;
size_of_val(&0u32) * 8;
}
fn main() {
option_as_ref_deref();
match_like_matches();
@ -75,4 +94,5 @@ fn main() {
match_same_arms2();
manual_strip_msrv();
check_index_refutable_slice();
borrow_as_ptr();
}

10
tests/ui-toml/min_rust_version/min_rust_version.stderr Normal file
View file

@ -0,0 +1,10 @@
error: you are using an explicit closure for copying elements
--> $DIR/min_rust_version.rs:74:26
|
LL | let _: Option<u64> = Some(&16).map(|b| *b);
| ^^^^^^^^^^^^^^^^^^^^^ help: consider calling the dedicated `cloned` method: `Some(&16).cloned()`
|
= note: `-D clippy::map-clone` implied by `-D warnings`
error: aborting due to previous error

6
tests/ui/borrow_interior_mutable_const/others.rs
View file

@ -1,9 +1,5 @@
#![warn(clippy::borrow_interior_mutable_const)]
#![allow(
clippy::declare_interior_mutable_const,
clippy::ref_in_deref,
clippy::needless_borrow
)]
#![allow(clippy::declare_interior_mutable_const, clippy::needless_borrow)]
#![allow(const_item_mutation)]
use std::borrow::Cow;

28
tests/ui/borrow_interior_mutable_const/others.stderr
View file

@ -1,5 +1,5 @@
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:58:5
--> $DIR/others.rs:54:5
|
LL | ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability
| ^^^^^^
@ -8,7 +8,7 @@ LL | ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:59:16
--> $DIR/others.rs:55:16
|
LL | assert_eq!(ATOMIC.load(Ordering::SeqCst), 5); //~ ERROR interior mutability
| ^^^^^^
@ -16,7 +16,7 @@ LL | assert_eq!(ATOMIC.load(Ordering::SeqCst), 5); //~ ERROR interior mutabi
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:62:22
--> $DIR/others.rs:58:22
|
LL | let _once_ref = &ONCE_INIT; //~ ERROR interior mutability
| ^^^^^^^^^
@ -24,7 +24,7 @@ LL | let _once_ref = &ONCE_INIT; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:63:25
--> $DIR/others.rs:59:25
|
LL | let _once_ref_2 = &&ONCE_INIT; //~ ERROR interior mutability
| ^^^^^^^^^
@ -32,7 +32,7 @@ LL | let _once_ref_2 = &&ONCE_INIT; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:64:27
--> $DIR/others.rs:60:27
|
LL | let _once_ref_4 = &&&&ONCE_INIT; //~ ERROR interior mutability
| ^^^^^^^^^
@ -40,7 +40,7 @@ LL | let _once_ref_4 = &&&&ONCE_INIT; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:65:26
--> $DIR/others.rs:61:26
|
LL | let _once_mut = &mut ONCE_INIT; //~ ERROR interior mutability
| ^^^^^^^^^
@ -48,7 +48,7 @@ LL | let _once_mut = &mut ONCE_INIT; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:76:14
--> $DIR/others.rs:72:14
|
LL | let _ = &ATOMIC_TUPLE; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -56,7 +56,7 @@ LL | let _ = &ATOMIC_TUPLE; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:77:14
--> $DIR/others.rs:73:14
|
LL | let _ = &ATOMIC_TUPLE.0; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -64,7 +64,7 @@ LL | let _ = &ATOMIC_TUPLE.0; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:78:19
--> $DIR/others.rs:74:19
|
LL | let _ = &(&&&&ATOMIC_TUPLE).0; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -72,7 +72,7 @@ LL | let _ = &(&&&&ATOMIC_TUPLE).0; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:79:14
--> $DIR/others.rs:75:14
|
LL | let _ = &ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -80,7 +80,7 @@ LL | let _ = &ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:80:13
--> $DIR/others.rs:76:13
|
LL | let _ = ATOMIC_TUPLE.0[0].load(Ordering::SeqCst); //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -88,7 +88,7 @@ LL | let _ = ATOMIC_TUPLE.0[0].load(Ordering::SeqCst); //~ ERROR interior mu
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:86:13
--> $DIR/others.rs:82:13
|
LL | let _ = ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
| ^^^^^^^^^^^^
@ -96,7 +96,7 @@ LL | let _ = ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:91:5
--> $DIR/others.rs:87:5
|
LL | CELL.set(2); //~ ERROR interior mutability
| ^^^^
@ -104,7 +104,7 @@ LL | CELL.set(2); //~ ERROR interior mutability
= help: assign this const to a local or static variable, and use the variable here
error: a `const` item with interior mutability should not be borrowed
--> $DIR/others.rs:92:16
--> $DIR/others.rs:88:16
|
LL | assert_eq!(CELL.get(), 6); //~ ERROR interior mutability
| ^^^^

2
tests/ui/bytecount.rs
View file

@ -1,3 +1,5 @@
#![allow(clippy::needless_borrow)]
#[deny(clippy::naive_bytecount)]
fn main() {
let x = vec![0_u8; 16];

8
tests/ui/bytecount.stderr
View file

@ -1,23 +1,23 @@
error: you appear to be counting bytes the naive way
--> $DIR/bytecount.rs:5:13
--> $DIR/bytecount.rs:7:13
|
LL | let _ = x.iter().filter(|&&a| a == 0).count(); // naive byte count
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the bytecount crate: `bytecount::count(x, 0)`
|
note: the lint level is defined here
--> $DIR/bytecount.rs:1:8
--> $DIR/bytecount.rs:3:8
|
LL | #[deny(clippy::naive_bytecount)]
| ^^^^^^^^^^^^^^^^^^^^^^^
error: you appear to be counting bytes the naive way
--> $DIR/bytecount.rs:7:13
--> $DIR/bytecount.rs:9:13
|
LL | let _ = (&x[..]).iter().filter(|&a| *a == 0).count(); // naive byte count
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the bytecount crate: `bytecount::count((&x[..]), 0)`
error: you appear to be counting bytes the naive way
--> $DIR/bytecount.rs:19:13
--> $DIR/bytecount.rs:21:13
|
LL | let _ = x.iter().filter(|a| b + 1 == **a).count(); // naive byte count
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using the bytecount crate: `bytecount::count(x, b + 1)`

3
tests/ui/clone_on_copy.fixed
View file

@ -7,7 +7,8 @@
clippy::no_effect,
clippy::unnecessary_operation,
clippy::vec_init_then_push,
clippy::toplevel_ref_arg
clippy::toplevel_ref_arg,
clippy::needless_borrow
)]
use std::cell::RefCell;

3
tests/ui/clone_on_copy.rs
View file

@ -7,7 +7,8 @@
clippy::no_effect,
clippy::unnecessary_operation,
clippy::vec_init_then_push,
clippy::toplevel_ref_arg
clippy::toplevel_ref_arg,
clippy::needless_borrow
)]
use std::cell::RefCell;

16
tests/ui/clone_on_copy.stderr
View file

@ -1,5 +1,5 @@
error: using `clone` on type `i32` which implements the `Copy` trait
--> $DIR/clone_on_copy.rs:24:5
--> $DIR/clone_on_copy.rs:25:5
|
LL | 42.clone();
| ^^^^^^^^^^ help: try removing the `clone` call: `42`
@ -7,43 +7,43 @@ LL | 42.clone();
= note: `-D clippy::clone-on-copy` implied by `-D warnings`
error: using `clone` on type `i32` which implements the `Copy` trait
--> $DIR/clone_on_copy.rs:28:5
--> $DIR/clone_on_copy.rs:29:5
|
LL | (&42).clone();
| ^^^^^^^^^^^^^ help: try dereferencing it: `*(&42)`
error: using `clone` on type `i32` which implements the `Copy` trait
--> $DIR/clone_on_copy.rs:31:5
--> $DIR/clone_on_copy.rs:32:5
|
LL | rc.borrow().clone();
| ^^^^^^^^^^^^^^^^^^^ help: try dereferencing it: `*rc.borrow()`
error: using `clone` on type `u32` which implements the `Copy` trait
--> $DIR/clone_on_copy.rs:34:5
--> $DIR/clone_on_copy.rs:35:5
|
LL | x.clone().rotate_left(1);
| ^^^^^^^^^ help: try removing the `clone` call: `x`
error: using `clone` on type `i32` which implements the `Copy` trait
--> $DIR/clone_on_copy.rs:48:5
--> $DIR/clone_on_copy.rs:49:5
|
LL | m!(42).clone();
| ^^^^^^^^^^^^^^ help: try removing the `clone` call: `m!(42)`
error: using `clone` on type `[u32; 2]` which implements the `Copy` trait
--> $DIR/clone_on_copy.rs:58:5
--> $DIR/clone_on_copy.rs:59:5
|
LL | x.clone()[0];
| ^^^^^^^^^ help: try dereferencing it: `(*x)`
error: using `clone` on type `char` which implements the `Copy` trait
--> $DIR/clone_on_copy.rs:68:14
--> $DIR/clone_on_copy.rs:69:14
|
LL | is_ascii('z'.clone());
| ^^^^^^^^^^^ help: try removing the `clone` call: `'z'`
error: using `clone` on type `i32` which implements the `Copy` trait
--> $DIR/clone_on_copy.rs:72:14
--> $DIR/clone_on_copy.rs:73:14
|
LL | vec.push(42.clone());
| ^^^^^^^^^^ help: try removing the `clone` call: `42`

29
tests/ui/cmp_owned/comparison_flip.fixed Normal file
View file

@ -0,0 +1,29 @@
// run-rustfix
use std::fmt::{self, Display};
fn main() {
let a = Foo;
if a != "bar" {
println!("foo");
}
if a != "bar" {
println!("foo");
}
}
struct Foo;
impl Display for Foo {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "foo")
}
}
impl PartialEq<&str> for Foo {
fn eq(&self, other: &&str) -> bool {
"foo" == *other
}
}

29
tests/ui/cmp_owned/comparison_flip.rs Normal file
View file

@ -0,0 +1,29 @@
// run-rustfix
use std::fmt::{self, Display};
fn main() {
let a = Foo;
if a.to_string() != "bar" {
println!("foo");
}
if "bar" != a.to_string() {
println!("foo");
}
}
struct Foo;
impl Display for Foo {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "foo")
}
}
impl PartialEq<&str> for Foo {
fn eq(&self, other: &&str) -> bool {
"foo" == *other
}
}

18
tests/ui/cmp_owned/comparison_flip.stderr Normal file
View file

@ -0,0 +1,18 @@
error: this creates an owned instance just for comparison
--> $DIR/comparison_flip.rs:8:8
|
LL | if a.to_string() != "bar" {
| ^^^^^^^^^^^^^ help: try: `a`
|
= note: `-D clippy::cmp-owned` implied by `-D warnings`
error: this creates an owned instance just for comparison
--> $DIR/comparison_flip.rs:12:17
|
LL | if "bar" != a.to_string() {
| ---------^^^^^^^^^^^^^
| |
| help: try: `a != "bar"`
error: aborting due to 2 previous errors

2
tests/ui/duration_subsec.fixed
View file

@ -1,5 +1,5 @@
// run-rustfix
#![allow(dead_code)]
#![allow(dead_code, clippy::needless_borrow)]
#![warn(clippy::duration_subsec)]
use std::time::Duration;

2
tests/ui/duration_subsec.rs
View file

@ -1,5 +1,5 @@
// run-rustfix
#![allow(dead_code)]
#![allow(dead_code, clippy::needless_borrow)]
#![warn(clippy::duration_subsec)]
use std::time::Duration;

7
tests/ui/enum_variants.rs
View file

@ -151,4 +151,11 @@ enum North {
NoRight,
}
// #8324
enum Phase {
PreLookup,
Lookup,
PostLookup,
}
fn main() {}

9
tests/ui/eta.fixed
View file

@ -5,13 +5,10 @@
clippy::no_effect,
clippy::redundant_closure_call,
clippy::needless_pass_by_value,
clippy::option_map_unit_fn
)]
#![warn(
clippy::redundant_closure,
clippy::redundant_closure_for_method_calls,
clippy::option_map_unit_fn,
clippy::needless_borrow
)]
#![warn(clippy::redundant_closure, clippy::redundant_closure_for_method_calls)]
use std::path::{Path, PathBuf};
@ -34,7 +31,7 @@ fn main() {
Some(1).map(closure_mac!()); // don't lint closure in macro expansion
let _: Option<Vec<u8>> = true.then(std::vec::Vec::new); // special case vec!
let d = Some(1u8).map(|a| foo(foo2(a))); //is adjusted?
all(&[1, 2, 3], &2, below); //is adjusted
all(&[1, 2, 3], &&2, below); //is adjusted
unsafe {
Some(1u8).map(|a| unsafe_fn(a)); // unsafe fn
}

7
tests/ui/eta.rs
View file

@ -5,13 +5,10 @@
clippy::no_effect,
clippy::redundant_closure_call,
clippy::needless_pass_by_value,
clippy::option_map_unit_fn
)]
#![warn(
clippy::redundant_closure,
clippy::redundant_closure_for_method_calls,
clippy::option_map_unit_fn,
clippy::needless_borrow
)]
#![warn(clippy::redundant_closure, clippy::redundant_closure_for_method_calls)]
use std::path::{Path, PathBuf};

50
tests/ui/eta.stderr
View file

@ -1,5 +1,5 @@
error: redundant closure
--> $DIR/eta.rs:31:27
--> $DIR/eta.rs:28:27
|
LL | let a = Some(1u8).map(|a| foo(a));
| ^^^^^^^^^^ help: replace the closure with the function itself: `foo`
@ -7,45 +7,37 @@ LL | let a = Some(1u8).map(|a| foo(a));
= note: `-D clippy::redundant-closure` implied by `-D warnings`
error: redundant closure
--> $DIR/eta.rs:35:40
--> $DIR/eta.rs:32:40
|
LL | let _: Option<Vec<u8>> = true.then(|| vec![]); // special case vec!
| ^^^^^^^^^ help: replace the closure with `Vec::new`: `std::vec::Vec::new`
error: redundant closure
--> $DIR/eta.rs:36:35
--> $DIR/eta.rs:33:35
|
LL | let d = Some(1u8).map(|a| foo((|b| foo2(b))(a))); //is adjusted?
| ^^^^^^^^^^^^^ help: replace the closure with the function itself: `foo2`
error: this expression borrows a reference (`&u8`) that is immediately dereferenced by the compiler
--> $DIR/eta.rs:37:21
|
LL | all(&[1, 2, 3], &&2, |x, y| below(x, y)); //is adjusted
| ^^^ help: change this to: `&2`
|
= note: `-D clippy::needless-borrow` implied by `-D warnings`
error: redundant closure
--> $DIR/eta.rs:37:26
--> $DIR/eta.rs:34:26
|
LL | all(&[1, 2, 3], &&2, |x, y| below(x, y)); //is adjusted
| ^^^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `below`
error: redundant closure
--> $DIR/eta.rs:43:27
--> $DIR/eta.rs:40:27
|
LL | let e = Some(1u8).map(|a| divergent(a));
| ^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `divergent`
error: redundant closure
--> $DIR/eta.rs:44:27
--> $DIR/eta.rs:41:27
|
LL | let e = Some(1u8).map(|a| generic(a));
| ^^^^^^^^^^^^^^ help: replace the closure with the function itself: `generic`
error: redundant closure
--> $DIR/eta.rs:90:51
--> $DIR/eta.rs:87:51
|
LL | let e = Some(TestStruct { some_ref: &i }).map(|a| a.foo());
| ^^^^^^^^^^^ help: replace the closure with the method itself: `TestStruct::foo`
@ -53,82 +45,82 @@ LL | let e = Some(TestStruct { some_ref: &i }).map(|a| a.foo());
= note: `-D clippy::redundant-closure-for-method-calls` implied by `-D warnings`
error: redundant closure
--> $DIR/eta.rs:91:51
--> $DIR/eta.rs:88:51
|
LL | let e = Some(TestStruct { some_ref: &i }).map(|a| a.trait_foo());
| ^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `TestTrait::trait_foo`
error: redundant closure
--> $DIR/eta.rs:93:42
--> $DIR/eta.rs:90:42
|
LL | let e = Some(&mut vec![1, 2, 3]).map(|v| v.clear());
| ^^^^^^^^^^^^^ help: replace the closure with the method itself: `std::vec::Vec::clear`
error: redundant closure
--> $DIR/eta.rs:97:29
--> $DIR/eta.rs:94:29
|
LL | let e = Some("str").map(|s| s.to_string());
| ^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `std::string::ToString::to_string`
error: redundant closure
--> $DIR/eta.rs:98:27
--> $DIR/eta.rs:95:27
|
LL | let e = Some('a').map(|s| s.to_uppercase());
| ^^^^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `char::to_uppercase`
error: redundant closure
--> $DIR/eta.rs:100:65
--> $DIR/eta.rs:97:65
|
LL | let e: std::vec::Vec<char> = vec!['a', 'b', 'c'].iter().map(|c| c.to_ascii_uppercase()).collect();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace the closure with the method itself: `char::to_ascii_uppercase`
error: redundant closure
--> $DIR/eta.rs:163:22
--> $DIR/eta.rs:160:22
|
LL | requires_fn_once(|| x());
| ^^^^^^ help: replace the closure with the function itself: `x`
error: redundant closure
--> $DIR/eta.rs:170:27
--> $DIR/eta.rs:167:27
|
LL | let a = Some(1u8).map(|a| foo_ptr(a));
| ^^^^^^^^^^^^^^ help: replace the closure with the function itself: `foo_ptr`
error: redundant closure
--> $DIR/eta.rs:175:27
--> $DIR/eta.rs:172:27
|
LL | let a = Some(1u8).map(|a| closure(a));
| ^^^^^^^^^^^^^^ help: replace the closure with the function itself: `closure`
error: redundant closure
--> $DIR/eta.rs:207:28
--> $DIR/eta.rs:204:28
|
LL | x.into_iter().for_each(|x| add_to_res(x));
| ^^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `&mut add_to_res`
error: redundant closure
--> $DIR/eta.rs:208:28
--> $DIR/eta.rs:205:28
|
LL | y.into_iter().for_each(|x| add_to_res(x));
| ^^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `&mut add_to_res`
error: redundant closure
--> $DIR/eta.rs:209:28
--> $DIR/eta.rs:206:28
|
LL | z.into_iter().for_each(|x| add_to_res(x));
| ^^^^^^^^^^^^^^^^^ help: replace the closure with the function itself: `add_to_res`
error: redundant closure
--> $DIR/eta.rs:216:21
--> $DIR/eta.rs:213:21
|
LL | Some(1).map(|n| closure(n));
| ^^^^^^^^^^^^^^ help: replace the closure with the function itself: `&mut closure`
error: redundant closure
--> $DIR/eta.rs:235:21
--> $DIR/eta.rs:232:21
|
LL | map_str_to_path(|s| s.as_ref());
| ^^^^^^^^^^^^^^ help: replace the closure with the method itself: `std::convert::AsRef::as_ref`
error: aborting due to 21 previous errors
error: aborting due to 20 previous errors

2
tests/ui/explicit_deref_methods.fixed
View file

@ -1,6 +1,6 @@
// run-rustfix
#![allow(unused_variables, clippy::clone_double_ref)]
#![allow(unused_variables, clippy::clone_double_ref, clippy::needless_borrow)]
#![warn(clippy::explicit_deref_methods)]
use std::ops::{Deref, DerefMut};

2
tests/ui/explicit_deref_methods.rs
View file

@ -1,6 +1,6 @@
// run-rustfix
#![allow(unused_variables, clippy::clone_double_ref)]
#![allow(unused_variables, clippy::clone_double_ref, clippy::needless_borrow)]
#![warn(clippy::explicit_deref_methods)]
use std::ops::{Deref, DerefMut};

7
tests/ui/for_loop_fixable.fixed
View file

@ -23,7 +23,12 @@ impl Unrelated {
clippy::iter_next_loop,
clippy::for_kv_map
)]
#[allow(clippy::linkedlist, clippy::unnecessary_mut_passed, clippy::similar_names)]
#[allow(
clippy::linkedlist,
clippy::unnecessary_mut_passed,
clippy::similar_names,
clippy::needless_borrow
)]
#[allow(unused_variables)]
fn main() {
let mut vec = vec![1, 2, 3, 4];

7
tests/ui/for_loop_fixable.rs
View file

@ -23,7 +23,12 @@ impl Unrelated {
clippy::iter_next_loop,
clippy::for_kv_map
)]
#[allow(clippy::linkedlist, clippy::unnecessary_mut_passed, clippy::similar_names)]
#[allow(
clippy::linkedlist,
clippy::unnecessary_mut_passed,
clippy::similar_names,
clippy::needless_borrow
)]
#[allow(unused_variables)]
fn main() {
let mut vec = vec![1, 2, 3, 4];

30
tests/ui/for_loop_fixable.stderr
View file

@ -1,5 +1,5 @@
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:38:15
--> $DIR/for_loop_fixable.rs:43:15
|
LL | for _v in vec.iter() {}
| ^^^^^^^^^^ help: to write this more concisely, try: `&vec`
@ -7,13 +7,13 @@ LL | for _v in vec.iter() {}
= note: `-D clippy::explicit-iter-loop` implied by `-D warnings`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:40:15
--> $DIR/for_loop_fixable.rs:45:15
|
LL | for _v in vec.iter_mut() {}
| ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&mut vec`
error: it is more concise to loop over containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:43:15
--> $DIR/for_loop_fixable.rs:48:15
|
LL | for _v in out_vec.into_iter() {}
| ^^^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `out_vec`
@ -21,73 +21,73 @@ LL | for _v in out_vec.into_iter() {}
= note: `-D clippy::explicit-into-iter-loop` implied by `-D warnings`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:48:15
--> $DIR/for_loop_fixable.rs:53:15
|
LL | for _v in [1, 2, 3].iter() {}
| ^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[1, 2, 3]`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:52:15
--> $DIR/for_loop_fixable.rs:57:15
|
LL | for _v in [0; 32].iter() {}
| ^^^^^^^^^^^^^^ help: to write this more concisely, try: `&[0; 32]`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:57:15
--> $DIR/for_loop_fixable.rs:62:15
|
LL | for _v in ll.iter() {}
| ^^^^^^^^^ help: to write this more concisely, try: `&ll`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:60:15
--> $DIR/for_loop_fixable.rs:65:15
|
LL | for _v in vd.iter() {}
| ^^^^^^^^^ help: to write this more concisely, try: `&vd`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:63:15
--> $DIR/for_loop_fixable.rs:68:15
|
LL | for _v in bh.iter() {}
| ^^^^^^^^^ help: to write this more concisely, try: `&bh`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:66:15
--> $DIR/for_loop_fixable.rs:71:15
|
LL | for _v in hm.iter() {}
| ^^^^^^^^^ help: to write this more concisely, try: `&hm`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:69:15
--> $DIR/for_loop_fixable.rs:74:15
|
LL | for _v in bt.iter() {}
| ^^^^^^^^^ help: to write this more concisely, try: `&bt`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:72:15
--> $DIR/for_loop_fixable.rs:77:15
|
LL | for _v in hs.iter() {}
| ^^^^^^^^^ help: to write this more concisely, try: `&hs`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:75:15
--> $DIR/for_loop_fixable.rs:80:15
|
LL | for _v in bs.iter() {}
| ^^^^^^^^^ help: to write this more concisely, try: `&bs`
error: it is more concise to loop over containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:250:18
--> $DIR/for_loop_fixable.rs:255:18
|
LL | for i in iterator.into_iter() {
| ^^^^^^^^^^^^^^^^^^^^ help: to write this more concisely, try: `iterator`
error: it is more concise to loop over references to containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:270:18
--> $DIR/for_loop_fixable.rs:275:18
|
LL | for _ in t.into_iter() {}
| ^^^^^^^^^^^^^ help: to write this more concisely, try: `&t`
error: it is more concise to loop over containers instead of using explicit iteration methods
--> $DIR/for_loop_fixable.rs:272:18
--> $DIR/for_loop_fixable.rs:277:18
|
LL | for _ in r.into_iter() {}
| ^^^^^^^^^^^^^ help: to write this more concisely, try: `r`

13
tests/ui/format.fixed
View file

@ -1,6 +1,11 @@
// run-rustfix
#![allow(clippy::print_literal, clippy::redundant_clone, clippy::to_string_in_format_args)]
#![allow(
clippy::print_literal,
clippy::redundant_clone,
clippy::to_string_in_format_args,
clippy::needless_borrow
)]
#![warn(clippy::useless_format)]
struct Foo(pub String);
@ -73,4 +78,10 @@ fn main() {
let _s: String = (&*v.join("\n")).to_string();
format!("prepend {:+}", "s");
// Issue #8290
let x = "foo";
let _ = x.to_string();
let _ = format!("{x:?}"); // Don't lint on debug
let _ = x.to_string();
}

13
tests/ui/format.rs
View file

@ -1,6 +1,11 @@
// run-rustfix
#![allow(clippy::print_literal, clippy::redundant_clone, clippy::to_string_in_format_args)]
#![allow(
clippy::print_literal,
clippy::redundant_clone,
clippy::to_string_in_format_args,
clippy::needless_borrow
)]
#![warn(clippy::useless_format)]
struct Foo(pub String);
@ -75,4 +80,10 @@ fn main() {
let _s: String = format!("{}", &*v.join("\n"));
format!("prepend {:+}", "s");
// Issue #8290
let x = "foo";
let _ = format!("{x}");
let _ = format!("{x:?}"); // Don't lint on debug
let _ = format!("{y}", y = x);
}

44
tests/ui/format.stderr
View file

@ -1,5 +1,5 @@
error: useless use of `format!`
--> $DIR/format.rs:13:5
--> $DIR/format.rs:18:5
|
LL | format!("foo");
| ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
@ -7,19 +7,19 @@ LL | format!("foo");
= note: `-D clippy::useless-format` implied by `-D warnings`
error: useless use of `format!`
--> $DIR/format.rs:14:5
--> $DIR/format.rs:19:5
|
LL | format!("{{}}");
| ^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{}".to_string()`
error: useless use of `format!`
--> $DIR/format.rs:15:5
--> $DIR/format.rs:20:5
|
LL | format!("{{}} abc {{}}");
| ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"{} abc {}".to_string()`
error: useless use of `format!`
--> $DIR/format.rs:16:5
--> $DIR/format.rs:21:5
|
LL | / format!(
LL | | r##"foo {{}}
@ -34,70 +34,82 @@ LL ~ " bar"##.to_string();
|
error: useless use of `format!`
--> $DIR/format.rs:21:13
--> $DIR/format.rs:26:13
|
LL | let _ = format!("");
| ^^^^^^^^^^^ help: consider using `String::new()`: `String::new()`
error: useless use of `format!`
--> $DIR/format.rs:23:5
--> $DIR/format.rs:28:5
|
LL | format!("{}", "foo");
| ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
error: useless use of `format!`
--> $DIR/format.rs:27:5
--> $DIR/format.rs:32:5
|
LL | format!("{:+}", "foo"); // Warn when the format makes no difference.
| ^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
error: useless use of `format!`
--> $DIR/format.rs:28:5
--> $DIR/format.rs:33:5
|
LL | format!("{:<}", "foo"); // Warn when the format makes no difference.
| ^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `"foo".to_string()`
error: useless use of `format!`
--> $DIR/format.rs:33:5
--> $DIR/format.rs:38:5
|
LL | format!("{}", arg);
| ^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`
error: useless use of `format!`
--> $DIR/format.rs:37:5
--> $DIR/format.rs:42:5
|
LL | format!("{:+}", arg); // Warn when the format makes no difference.
| ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`
error: useless use of `format!`
--> $DIR/format.rs:38:5
--> $DIR/format.rs:43:5
|
LL | format!("{:<}", arg); // Warn when the format makes no difference.
| ^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `arg.to_string()`
error: useless use of `format!`
--> $DIR/format.rs:65:5
--> $DIR/format.rs:70:5
|
LL | format!("{}", 42.to_string());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `42.to_string()`
error: useless use of `format!`
--> $DIR/format.rs:67:5
--> $DIR/format.rs:72:5
|
LL | format!("{}", x.display().to_string());
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.display().to_string()`
error: useless use of `format!`
--> $DIR/format.rs:71:18
--> $DIR/format.rs:76:18
|
LL | let _ = Some(format!("{}", a + "bar"));
| ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `a + "bar"`
error: useless use of `format!`
--> $DIR/format.rs:75:22
--> $DIR/format.rs:80:22
|
LL | let _s: String = format!("{}", &*v.join("/n"));
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `(&*v.join("/n")).to_string()`
error: aborting due to 15 previous errors
error: useless use of `format!`
--> $DIR/format.rs:86:13
|
LL | let _ = format!("{x}");
| ^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`
error: useless use of `format!`
--> $DIR/format.rs:88:13
|
LL | let _ = format!("{y}", y = x);
| ^^^^^^^^^^^^^^^^^^^^^ help: consider using `.to_string()`: `x.to_string()`
error: aborting due to 17 previous errors

17
tests/ui/if_same_then_else2.rs
View file

@ -138,6 +138,23 @@ fn if_same_then_else2() -> Result<&'static str, ()> {
let (y, x) = (1, 2);
return Ok(&foo[x..y]);
}
// Issue #7579
let _ = if let Some(0) = None { 0 } else { 0 };
if true {
return Err(());
} else if let Some(0) = None {
return Err(());
}
let _ = if let Some(0) = None {
0
} else if let Some(1) = None {
0
} else {
0
};
}
fn main() {}

45
tests/ui/iter_overeager_cloned.fixed Normal file
View file

@ -0,0 +1,45 @@
// run-rustfix
#![warn(clippy::iter_overeager_cloned, clippy::redundant_clone, clippy::filter_next)]
fn main() {
let vec = vec!["1".to_string(), "2".to_string(), "3".to_string()];
let _: Option<String> = vec.iter().last().cloned();
let _: Option<String> = vec.iter().chain(vec.iter()).next().cloned();
let _: usize = vec.iter().filter(|x| x == &"2").count();
let _: Vec<_> = vec.iter().take(2).cloned().collect();
let _: Vec<_> = vec.iter().skip(2).cloned().collect();
let _ = vec.iter().filter(|x| x == &"2").nth(2).cloned();
let _ = [Some(Some("str".to_string())), Some(Some("str".to_string()))]
.iter().flatten().cloned();
// Not implemented yet
let _ = vec.iter().cloned().filter(|x| x.starts_with('2'));
// Not implemented yet
let _ = vec.iter().cloned().map(|x| x.len());
// This would fail if changed.
let _ = vec.iter().cloned().map(|x| x + "2");
// Not implemented yet
let _ = vec.iter().cloned().find(|x| x == "2");
// Not implemented yet
let _ = vec.iter().cloned().for_each(|x| assert!(!x.is_empty()));
// Not implemented yet
let _ = vec.iter().cloned().all(|x| x.len() == 1);
// Not implemented yet
let _ = vec.iter().cloned().any(|x| x.len() == 1);
// Should probably stay as it is.
let _ = [0, 1, 2, 3, 4].iter().cloned().take(10);
}

47
tests/ui/iter_overeager_cloned.rs Normal file
View file

@ -0,0 +1,47 @@
// run-rustfix
#![warn(clippy::iter_overeager_cloned, clippy::redundant_clone, clippy::filter_next)]
fn main() {
let vec = vec!["1".to_string(), "2".to_string(), "3".to_string()];
let _: Option<String> = vec.iter().cloned().last();
let _: Option<String> = vec.iter().chain(vec.iter()).cloned().next();
let _: usize = vec.iter().filter(|x| x == &"2").cloned().count();
let _: Vec<_> = vec.iter().cloned().take(2).collect();
let _: Vec<_> = vec.iter().cloned().skip(2).collect();
let _ = vec.iter().filter(|x| x == &"2").cloned().nth(2);
let _ = [Some(Some("str".to_string())), Some(Some("str".to_string()))]
.iter()
.cloned()
.flatten();
// Not implemented yet
let _ = vec.iter().cloned().filter(|x| x.starts_with('2'));
// Not implemented yet
let _ = vec.iter().cloned().map(|x| x.len());
// This would fail if changed.
let _ = vec.iter().cloned().map(|x| x + "2");
// Not implemented yet
let _ = vec.iter().cloned().find(|x| x == "2");
// Not implemented yet
let _ = vec.iter().cloned().for_each(|x| assert!(!x.is_empty()));
// Not implemented yet
let _ = vec.iter().cloned().all(|x| x.len() == 1);
// Not implemented yet
let _ = vec.iter().cloned().any(|x| x.len() == 1);
// Should probably stay as it is.
let _ = [0, 1, 2, 3, 4].iter().cloned().take(10);
}

58
tests/ui/iter_overeager_cloned.stderr Normal file
View file

@ -0,0 +1,58 @@
error: called `cloned().last()` on an `Iterator`. It may be more efficient to call `last().cloned()` instead
--> $DIR/iter_overeager_cloned.rs:7:29
|
LL | let _: Option<String> = vec.iter().cloned().last();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec.iter().last().cloned()`
|
= note: `-D clippy::iter-overeager-cloned` implied by `-D warnings`
error: called `cloned().next()` on an `Iterator`. It may be more efficient to call `next().cloned()` instead
--> $DIR/iter_overeager_cloned.rs:9:29
|
LL | let _: Option<String> = vec.iter().chain(vec.iter()).cloned().next();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec.iter().chain(vec.iter()).next().cloned()`
error: called `cloned().count()` on an `Iterator`. It may be more efficient to call `count()` instead
--> $DIR/iter_overeager_cloned.rs:11:20
|
LL | let _: usize = vec.iter().filter(|x| x == &"2").cloned().count();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec.iter().filter(|x| x == &"2").count()`
|
= note: `-D clippy::redundant-clone` implied by `-D warnings`
error: called `cloned().take(...)` on an `Iterator`. It may be more efficient to call `take(...).cloned()` instead
--> $DIR/iter_overeager_cloned.rs:13:21
|
LL | let _: Vec<_> = vec.iter().cloned().take(2).collect();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec.iter().take(2).cloned()`
error: called `cloned().skip(...)` on an `Iterator`. It may be more efficient to call `skip(...).cloned()` instead
--> $DIR/iter_overeager_cloned.rs:15:21
|
LL | let _: Vec<_> = vec.iter().cloned().skip(2).collect();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec.iter().skip(2).cloned()`
error: called `cloned().nth(...)` on an `Iterator`. It may be more efficient to call `nth(...).cloned()` instead
--> $DIR/iter_overeager_cloned.rs:17:13
|
LL | let _ = vec.iter().filter(|x| x == &"2").cloned().nth(2);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `vec.iter().filter(|x| x == &"2").nth(2).cloned()`
error: called `cloned().flatten()` on an `Iterator`. It may be more efficient to call `flatten().cloned()` instead
--> $DIR/iter_overeager_cloned.rs:19:13
|
LL | let _ = [Some(Some("str".to_string())), Some(Some("str".to_string()))]
| _____________^
LL | | .iter()
LL | | .cloned()
LL | | .flatten();
| |__________________^
|
help: try this
|
LL ~ let _ = [Some(Some("str".to_string())), Some(Some("str".to_string()))]
LL ~ .iter().flatten().cloned();
|
error: aborting due to 7 previous errors

27
tests/ui/needless_borrow.fixed
View file

@ -45,6 +45,33 @@ fn main() {
let b = &mut b;
x(b);
}
// Issue #8191
let mut x = 5;
let mut x = &mut x;
mut_ref(x);
mut_ref(x);
let y: &mut i32 = x;
let y: &mut i32 = x;
let y = match 0 {
// Don't lint. Removing the borrow would move 'x'
0 => &mut x,
_ => &mut *x,
};
*x = 5;
let s = String::new();
let _ = s.len();
let _ = s.capacity();
let _ = s.capacity();
let x = (1, 2);
let _ = x.0;
let x = &x as *const (i32, i32);
let _ = unsafe { (*x).0 };
}
#[allow(clippy::needless_borrowed_reference)]

27
tests/ui/needless_borrow.rs
View file

@ -45,6 +45,33 @@ fn main() {
let b = &mut b;
x(&b);
}
// Issue #8191
let mut x = 5;
let mut x = &mut x;
mut_ref(&mut x);
mut_ref(&mut &mut x);
let y: &mut i32 = &mut x;
let y: &mut i32 = &mut &mut x;
let y = match 0 {
// Don't lint. Removing the borrow would move 'x'
0 => &mut x,
_ => &mut *x,
};
*x = 5;
let s = String::new();
let _ = (&s).len();
let _ = (&s).capacity();
let _ = (&&s).capacity();
let x = (1, 2);
let _ = (&x).0;
let x = &x as *const (i32, i32);
let _ = unsafe { (&*x).0 };
}
#[allow(clippy::needless_borrowed_reference)]

76
tests/ui/needless_borrow.stderr
View file

@ -1,4 +1,4 @@
error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:9:15
|
LL | let _ = x(&&a); // warn
@ -6,59 +6,113 @@ LL | let _ = x(&&a); // warn
|
= note: `-D clippy::needless-borrow` implied by `-D warnings`
error: this expression borrows a reference (`&mut i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:13:13
|
LL | mut_ref(&mut &mut b); // warn
| ^^^^^^^^^^^ help: change this to: `&mut b`
error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:25:13
|
LL | &&a
| ^^^ help: change this to: `&a`
error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:27:15
|
LL | 46 => &&a,
| ^^^ help: change this to: `&a`
error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:33:27
|
LL | break &ref_a;
| ^^^^^^ help: change this to: `ref_a`
error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:40:15
|
LL | let _ = x(&&&a);
| ^^^^ help: change this to: `&a`
error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:41:15
|
LL | let _ = x(&mut &&a);
| ^^^^^^^^ help: change this to: `&a`
error: this expression borrows a reference (`&mut i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:42:15
|
LL | let _ = x(&&&mut b);
| ^^^^^^^^ help: change this to: `&mut b`
error: this expression borrows a reference (`&i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:43:15
|
LL | let _ = x(&&ref_a);
| ^^^^^^^ help: change this to: `ref_a`
error: this expression borrows a reference (`&mut i32`) that is immediately dereferenced by the compiler
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:46:11
|
LL | x(&b);
| ^^ help: change this to: `b`
error: aborting due to 10 previous errors
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:53:13
|
LL | mut_ref(&mut x);
| ^^^^^^ help: change this to: `x`
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:54:13
|
LL | mut_ref(&mut &mut x);
| ^^^^^^^^^^^ help: change this to: `x`
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:55:23
|
LL | let y: &mut i32 = &mut x;
| ^^^^^^ help: change this to: `x`
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:56:23
|
LL | let y: &mut i32 = &mut &mut x;
| ^^^^^^^^^^^ help: change this to: `x`
error: this expression borrows a value the compiler would automatically borrow
--> $DIR/needless_borrow.rs:67:13
|
LL | let _ = (&s).len();
| ^^^^ help: change this to: `s`
error: this expression borrows a value the compiler would automatically borrow
--> $DIR/needless_borrow.rs:68:13
|
LL | let _ = (&s).capacity();
| ^^^^ help: change this to: `s`
error: this expression creates a reference which is immediately dereferenced by the compiler
--> $DIR/needless_borrow.rs:69:13
|
LL | let _ = (&&s).capacity();
| ^^^^^ help: change this to: `s`
error: this expression borrows a value the compiler would automatically borrow
--> $DIR/needless_borrow.rs:72:13
|
LL | let _ = (&x).0;
| ^^^^ help: change this to: `x`
error: this expression borrows a value the compiler would automatically borrow
--> $DIR/needless_borrow.rs:74:22
|
LL | let _ = unsafe { (&*x).0 };
| ^^^^^ help: change this to: `(*x)`
error: aborting due to 19 previous errors

51
tests/ui/needless_lifetimes.rs
View file

@ -1,5 +1,11 @@
#![warn(clippy::needless_lifetimes)]
#![allow(dead_code, clippy::needless_pass_by_value, clippy::unnecessary_wraps, dyn_drop)]
#![allow(
dead_code,
clippy::boxed_local,
clippy::needless_pass_by_value,
clippy::unnecessary_wraps,
dyn_drop
)]
fn distinct_lifetimes<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: u8) {}
@ -369,4 +375,47 @@ mod issue6159 {
}
}
mod issue7296 {
use std::rc::Rc;
use std::sync::Arc;
struct Foo;
impl Foo {
fn implicit<'a>(&'a self) -> &'a () {
&()
}
fn implicit_mut<'a>(&'a mut self) -> &'a () {
&()
}
fn explicit<'a>(self: &'a Arc<Self>) -> &'a () {
&()
}
fn explicit_mut<'a>(self: &'a mut Rc<Self>) -> &'a () {
&()
}
fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
&()
}
}
trait Bar {
fn implicit<'a>(&'a self) -> &'a ();
fn implicit_provided<'a>(&'a self) -> &'a () {
&()
}
fn explicit<'a>(self: &'a Arc<Self>) -> &'a ();
fn explicit_provided<'a>(self: &'a Arc<Self>) -> &'a () {
&()
}
fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a ();
fn lifetime_elsewhere_provided<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
&()
}
}
}
fn main() {}

94
tests/ui/needless_lifetimes.stderr
View file

@ -1,5 +1,5 @@
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:4:1
--> $DIR/needless_lifetimes.rs:10:1
|
LL | fn distinct_lifetimes<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: u8) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@ -7,148 +7,190 @@ LL | fn distinct_lifetimes<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: u8) {}
= note: `-D clippy::needless-lifetimes` implied by `-D warnings`
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:6:1
--> $DIR/needless_lifetimes.rs:12:1
|
LL | fn distinct_and_static<'a, 'b>(_x: &'a u8, _y: &'b u8, _z: &'static u8) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:16:1
--> $DIR/needless_lifetimes.rs:22:1
|
LL | fn in_and_out<'a>(x: &'a u8, _y: u8) -> &'a u8 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:50:1
--> $DIR/needless_lifetimes.rs:56:1
|
LL | fn deep_reference_3<'a>(x: &'a u8, _y: u8) -> Result<&'a u8, ()> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:55:1
--> $DIR/needless_lifetimes.rs:61:1
|
LL | fn where_clause_without_lt<'a, T>(x: &'a u8, _y: u8) -> Result<&'a u8, ()>
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:67:1
--> $DIR/needless_lifetimes.rs:73:1
|
LL | fn lifetime_param_2<'a, 'b>(_x: Ref<'a>, _y: &'b u8) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:91:1
--> $DIR/needless_lifetimes.rs:97:1
|
LL | fn fn_bound_2<'a, F, I>(_m: Lt<'a, I>, _f: F) -> Lt<'a, I>
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:121:5
--> $DIR/needless_lifetimes.rs:127:5
|
LL | fn self_and_out<'s>(&'s self) -> &'s u8 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:130:5
--> $DIR/needless_lifetimes.rs:136:5
|
LL | fn distinct_self_and_in<'s, 't>(&'s self, _x: &'t u8) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:149:1
--> $DIR/needless_lifetimes.rs:155:1
|
LL | fn struct_with_lt<'a>(_foo: Foo<'a>) -> &'a str {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:179:1
--> $DIR/needless_lifetimes.rs:185:1
|
LL | fn trait_obj_elided2<'a>(_arg: &'a dyn Drop) -> &'a str {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:185:1
--> $DIR/needless_lifetimes.rs:191:1
|
LL | fn alias_with_lt<'a>(_foo: FooAlias<'a>) -> &'a str {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:204:1
--> $DIR/needless_lifetimes.rs:210:1
|
LL | fn named_input_elided_output<'a>(_arg: &'a str) -> &str {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:212:1
--> $DIR/needless_lifetimes.rs:218:1
|
LL | fn trait_bound_ok<'a, T: WithLifetime<'static>>(_: &'a u8, _: T) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:248:1
--> $DIR/needless_lifetimes.rs:254:1
|
LL | fn out_return_type_lts<'a>(e: &'a str) -> Cow<'a> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:255:9
--> $DIR/needless_lifetimes.rs:261:9
|
LL | fn needless_lt<'a>(x: &'a u8) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:259:9
--> $DIR/needless_lifetimes.rs:265:9
|
LL | fn needless_lt<'a>(_x: &'a u8) {}
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:272:9
--> $DIR/needless_lifetimes.rs:278:9
|
LL | fn baz<'a>(&'a self) -> impl Foo + 'a {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:301:5
--> $DIR/needless_lifetimes.rs:307:5
|
LL | fn impl_trait_elidable_nested_named_lifetimes<'a>(i: &'a i32, f: impl for<'b> Fn(&'b i32) -> &'b i32) -> &'a i32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:304:5
--> $DIR/needless_lifetimes.rs:310:5
|
LL | fn impl_trait_elidable_nested_anonymous_lifetimes<'a>(i: &'a i32, f: impl Fn(&i32) -> &i32) -> &'a i32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:313:5
--> $DIR/needless_lifetimes.rs:319:5
|
LL | fn generics_elidable<'a, T: Fn(&i32) -> &i32>(i: &'a i32, f: T) -> &'a i32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:325:5
--> $DIR/needless_lifetimes.rs:331:5
|
LL | fn where_clause_elidadable<'a, T>(i: &'a i32, f: T) -> &'a i32
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:340:5
--> $DIR/needless_lifetimes.rs:346:5
|
LL | fn pointer_fn_elidable<'a>(i: &'a i32, f: fn(&i32) -> &i32) -> &'a i32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:353:5
--> $DIR/needless_lifetimes.rs:359:5
|
LL | fn nested_fn_pointer_3<'a>(_: &'a i32) -> fn(fn(&i32) -> &i32) -> i32 {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:356:5
--> $DIR/needless_lifetimes.rs:362:5
|
LL | fn nested_fn_pointer_4<'a>(_: &'a i32) -> impl Fn(fn(&i32)) {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 25 previous errors
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:384:9
|
LL | fn implicit<'a>(&'a self) -> &'a () {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:387:9
|
LL | fn implicit_mut<'a>(&'a mut self) -> &'a () {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:398:9
|
LL | fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:404:9
|
LL | fn implicit<'a>(&'a self) -> &'a ();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:405:9
|
LL | fn implicit_provided<'a>(&'a self) -> &'a () {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:414:9
|
LL | fn lifetime_elsewhere<'a>(self: Box<Self>, here: &'a ()) -> &'a ();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)
--> $DIR/needless_lifetimes.rs:415:9
|
LL | fn lifetime_elsewhere_provided<'a>(self: Box<Self>, here: &'a ()) -> &'a () {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: aborting due to 32 previous errors

13
tests/ui/needless_question_mark.fixed
View file

@ -125,3 +125,16 @@ pub fn test2() {
let x = Some(3);
let _x = some_and_qmark_in_macro!(x?);
}
async fn async_option_bad(to: TO) -> Option<usize> {
let _ = Some(3);
to.magic
}
async fn async_deref_ref(s: Option<&String>) -> Option<&str> {
Some(s?)
}
async fn async_result_bad(s: TR) -> Result<usize, bool> {
s.magic
}

13
tests/ui/needless_question_mark.rs
View file

@ -125,3 +125,16 @@ pub fn test2() {
let x = Some(3);
let _x = some_and_qmark_in_macro!(x?);
}
async fn async_option_bad(to: TO) -> Option<usize> {
let _ = Some(3);
Some(to.magic?)
}
async fn async_deref_ref(s: Option<&String>) -> Option<&str> {
Some(s?)
}
async fn async_result_bad(s: TR) -> Result<usize, bool> {
Ok(s.magic?)
}

14
tests/ui/needless_question_mark.stderr
View file

@ -77,5 +77,17 @@ LL | let _x = some_and_qmark_in_macro!(x?);
|
= note: this error originates in the macro `some_and_qmark_in_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 12 previous errors
error: question mark operator is useless here
--> $DIR/needless_question_mark.rs:131:5
|
LL | Some(to.magic?)
| ^^^^^^^^^^^^^^^ help: try removing question mark and `Some()`: `to.magic`
error: question mark operator is useless here
--> $DIR/needless_question_mark.rs:139:5
|
LL | Ok(s.magic?)
| ^^^^^^^^^^^^ help: try removing question mark and `Ok()`: `s.magic`
error: aborting due to 14 previous errors

39
tests/ui/op_ref.rs
View file

@ -1,7 +1,7 @@
#![allow(unused_variables, clippy::blacklisted_name)]
#![warn(clippy::op_ref)]
use std::collections::HashSet;
use std::ops::BitAnd;
use std::ops::{BitAnd, Mul};
fn main() {
let tracked_fds: HashSet<i32> = HashSet::new();
@ -55,3 +55,40 @@ fn main() {
let y = Y(2);
let z = x & &y;
}
#[derive(Clone, Copy)]
struct A(i32);
#[derive(Clone, Copy)]
struct B(i32);
impl Mul<&A> for B {
type Output = i32;
fn mul(self, rhs: &A) -> Self::Output {
self.0 * rhs.0
}
}
impl Mul<A> for B {
type Output = i32;
fn mul(self, rhs: A) -> Self::Output {
// Should not lint because removing the reference would lead to unconditional recursion
self * &rhs
}
}
impl Mul<&A> for A {
type Output = i32;
fn mul(self, rhs: &A) -> Self::Output {
self.0 * rhs.0
}
}
impl Mul<A> for A {
type Output = i32;
fn mul(self, rhs: A) -> Self::Output {
let one = B(1);
let two = 2;
let three = 3;
let _ = one * &self;
let _ = two + &three;
// Removing the reference would lead to unconditional recursion
self * &rhs
}
}

18
tests/ui/op_ref.stderr
View file

@ -18,5 +18,21 @@ LL | let z = x & &y;
| |
| help: use the right value directly: `y`
error: aborting due to 2 previous errors
error: taken reference of right operand
--> $DIR/op_ref.rs:89:17
|
LL | let _ = one * &self;
| ^^^^^^-----
| |
| help: use the right value directly: `self`
error: taken reference of right operand
--> $DIR/op_ref.rs:90:17
|
LL | let _ = two + &three;
| ^^^^^^------
| |
| help: use the right value directly: `three`
error: aborting due to 4 previous errors

48
tests/ui/or_fun_call.fixed
View file

@ -176,4 +176,52 @@ mod issue6675 {
}
}
mod issue8239 {
fn more_than_max_suggestion_highest_lines_0() {
let frames = Vec::new();
frames
.iter()
.map(|f: &String| f.to_lowercase())
.reduce(|mut acc, f| {
acc.push_str(&f);
acc
})
.unwrap_or_default();
}
fn more_to_max_suggestion_highest_lines_1() {
let frames = Vec::new();
let iter = frames.iter();
iter.map(|f: &String| f.to_lowercase())
.reduce(|mut acc, f| {
let _ = "";
let _ = "";
acc.push_str(&f);
acc
})
.unwrap_or_default();
}
fn equal_to_max_suggestion_highest_lines() {
let frames = Vec::new();
let iter = frames.iter();
iter.map(|f: &String| f.to_lowercase())
.reduce(|mut acc, f| {
let _ = "";
acc.push_str(&f);
acc
}).unwrap_or_default();
}
fn less_than_max_suggestion_highest_lines() {
let frames = Vec::new();
let iter = frames.iter();
let map = iter.map(|f: &String| f.to_lowercase());
map.reduce(|mut acc, f| {
acc.push_str(&f);
acc
}).unwrap_or_default();
}
}
fn main() {}

50
tests/ui/or_fun_call.rs
View file

@ -176,4 +176,54 @@ mod issue6675 {
}
}
mod issue8239 {
fn more_than_max_suggestion_highest_lines_0() {
let frames = Vec::new();
frames
.iter()
.map(|f: &String| f.to_lowercase())
.reduce(|mut acc, f| {
acc.push_str(&f);
acc
})
.unwrap_or(String::new());
}
fn more_to_max_suggestion_highest_lines_1() {
let frames = Vec::new();
let iter = frames.iter();
iter.map(|f: &String| f.to_lowercase())
.reduce(|mut acc, f| {
let _ = "";
let _ = "";
acc.push_str(&f);
acc
})
.unwrap_or(String::new());
}
fn equal_to_max_suggestion_highest_lines() {
let frames = Vec::new();
let iter = frames.iter();
iter.map(|f: &String| f.to_lowercase())
.reduce(|mut acc, f| {
let _ = "";
acc.push_str(&f);
acc
})
.unwrap_or(String::new());
}
fn less_than_max_suggestion_highest_lines() {
let frames = Vec::new();
let iter = frames.iter();
let map = iter.map(|f: &String| f.to_lowercase());
map.reduce(|mut acc, f| {
acc.push_str(&f);
acc
})
.unwrap_or(String::new());
}
}
fn main() {}

54
tests/ui/or_fun_call.stderr
View file

@ -108,5 +108,57 @@ error: use of `unwrap_or` followed by a function call
LL | None.unwrap_or( unsafe { ptr_to_ref(s) } );
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_else(|| unsafe { ptr_to_ref(s) })`
error: aborting due to 18 previous errors
error: use of `unwrap_or` followed by a call to `new`
--> $DIR/or_fun_call.rs:189:14
|
LL | .unwrap_or(String::new());
| ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_default()`
error: use of `unwrap_or` followed by a call to `new`
--> $DIR/or_fun_call.rs:202:14
|
LL | .unwrap_or(String::new());
| ^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `unwrap_or_default()`
error: use of `unwrap_or` followed by a call to `new`
--> $DIR/or_fun_call.rs:208:9
|
LL | / iter.map(|f: &String| f.to_lowercase())
LL | | .reduce(|mut acc, f| {
LL | | let _ = "";
LL | | acc.push_str(&f);
LL | | acc
LL | | })
LL | | .unwrap_or(String::new());
| |_____________________________________^
|
help: try this
|
LL ~ iter.map(|f: &String| f.to_lowercase())
LL + .reduce(|mut acc, f| {
LL + let _ = "";
LL + acc.push_str(&f);
LL + acc
LL ~ }).unwrap_or_default();
|
error: use of `unwrap_or` followed by a call to `new`
--> $DIR/or_fun_call.rs:221:9
|
LL | / map.reduce(|mut acc, f| {
LL | | acc.push_str(&f);
LL | | acc
LL | | })
LL | | .unwrap_or(String::new());
| |_________________________________^
|
help: try this
|
LL ~ map.reduce(|mut acc, f| {
LL + acc.push_str(&f);
LL + acc
LL ~ }).unwrap_or_default();
|
error: aborting due to 22 previous errors

29
tests/ui/ptr_arg.rs
View file

@ -9,7 +9,6 @@ fn do_vec(x: &Vec<i64>) {
}
fn do_vec_mut(x: &mut Vec<i64>) {
// no error here
//Nothing here
}
@ -18,7 +17,6 @@ fn do_str(x: &String) {
}
fn do_str_mut(x: &mut String) {
// no error here
//Nothing here either
}
@ -27,7 +25,6 @@ fn do_path(x: &PathBuf) {
}
fn do_path_mut(x: &mut PathBuf) {
// no error here
//Nothing here either
}
@ -52,7 +49,7 @@ fn cloned(x: &Vec<u8>) -> Vec<u8> {
let e = x.clone();
let f = e.clone(); // OK
let g = x;
let h = g.clone(); // Alas, we cannot reliably detect this without following data.
let h = g.clone();
let i = (e).clone();
x.clone()
}
@ -156,6 +153,30 @@ mod issue6509 {
}
}
fn mut_vec_slice_methods(v: &mut Vec<u32>) {
v.copy_within(1..5, 10);
}
fn mut_vec_vec_methods(v: &mut Vec<u32>) {
v.clear();
}
fn vec_contains(v: &Vec<u32>) -> bool {
[vec![], vec![0]].as_slice().contains(v)
}
fn fn_requires_vec(v: &Vec<u32>) -> bool {
vec_contains(v)
}
fn impl_fn_requires_vec(v: &Vec<u32>, f: impl Fn(&Vec<u32>)) {
f(v);
}
fn dyn_fn_requires_vec(v: &Vec<u32>, f: &dyn Fn(&Vec<u32>)) {
f(v);
}
// No error for types behind an alias (#7699)
type A = Vec<u8>;
fn aliased(a: &A) {}

158
tests/ui/ptr_arg.stderr
View file

@ -1,4 +1,4 @@
error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices
error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:7:14
|
LL | fn do_vec(x: &Vec<i64>) {
@ -6,170 +6,154 @@ LL | fn do_vec(x: &Vec<i64>) {
|
= note: `-D clippy::ptr-arg` implied by `-D warnings`
error: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:11:18
|
LL | fn do_vec_mut(x: &mut Vec<i64>) {
| ^^^^^^^^^^^^^ help: change this to: `&mut [i64]`
error: writing `&String` instead of `&str` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:16:14
--> $DIR/ptr_arg.rs:15:14
|
LL | fn do_str(x: &String) {
| ^^^^^^^ help: change this to: `&str`
error: writing `&mut String` instead of `&mut str` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:19:18
|
LL | fn do_str_mut(x: &mut String) {
| ^^^^^^^^^^^ help: change this to: `&mut str`
error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:25:15
--> $DIR/ptr_arg.rs:23:15
|
LL | fn do_path(x: &PathBuf) {
| ^^^^^^^^ help: change this to: `&Path`
error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices
--> $DIR/ptr_arg.rs:38:18
error: writing `&mut PathBuf` instead of `&mut Path` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:27:19
|
LL | fn do_path_mut(x: &mut PathBuf) {
| ^^^^^^^^^^^^ help: change this to: `&mut Path`
error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:35:18
|
LL | fn do_vec(x: &Vec<i64>);
| ^^^^^^^^^ help: change this to: `&[i64]`
error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices
--> $DIR/ptr_arg.rs:51:14
error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:48:14
|
LL | fn cloned(x: &Vec<u8>) -> Vec<u8> {
| ^^^^^^^^
|
help: change this to
|
LL | fn cloned(x: &[u8]) -> Vec<u8> {
| ~~~~~
help: change `x.clone()` to
|
LL | let e = x.to_owned();
| ~~~~~~~~~~~~
help: change `x.clone()` to
|
LL | x.to_owned()
|
LL ~ fn cloned(x: &[u8]) -> Vec<u8> {
LL ~ let e = x.to_owned();
LL | let f = e.clone(); // OK
LL | let g = x;
LL ~ let h = g.to_owned();
LL | let i = (e).clone();
...
error: writing `&String` instead of `&str` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:60:18
--> $DIR/ptr_arg.rs:57:18
|
LL | fn str_cloned(x: &String) -> String {
| ^^^^^^^
|
help: change this to
|
LL | fn str_cloned(x: &str) -> String {
| ~~~~
help: change `x.clone()` to
|
LL | let a = x.to_string();
| ~~~~~~~~~~~~~
help: change `x.clone()` to
|
LL | let b = x.to_string();
| ~~~~~~~~~~~~~
help: change `x.clone()` to
|
LL | x.to_string()
LL ~ fn str_cloned(x: &str) -> String {
LL ~ let a = x.to_owned();
LL ~ let b = x.to_owned();
LL | let c = b.clone();
LL | let d = a.clone().clone().clone();
LL ~ x.to_owned()
|
error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:68:19
--> $DIR/ptr_arg.rs:65:19
|
LL | fn path_cloned(x: &PathBuf) -> PathBuf {
| ^^^^^^^^
|
help: change this to
|
LL | fn path_cloned(x: &Path) -> PathBuf {
| ~~~~~
help: change `x.clone()` to
|
LL | let a = x.to_path_buf();
| ~~~~~~~~~~~~~~~
help: change `x.clone()` to
|
LL | let b = x.to_path_buf();
| ~~~~~~~~~~~~~~~
help: change `x.clone()` to
|
LL | x.to_path_buf()
LL ~ fn path_cloned(x: &Path) -> PathBuf {
LL ~ let a = x.to_path_buf();
LL ~ let b = x.to_path_buf();
LL | let c = b.clone();
LL | let d = a.clone().clone().clone();
LL ~ x.to_path_buf()
|
error: writing `&String` instead of `&str` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:76:44
--> $DIR/ptr_arg.rs:73:44
|
LL | fn false_positive_capacity(x: &Vec<u8>, y: &String) {
| ^^^^^^^
|
help: change this to
|
LL | fn false_positive_capacity(x: &Vec<u8>, y: &str) {
| ~~~~
help: change `y.clone()` to
LL ~ fn false_positive_capacity(x: &Vec<u8>, y: &str) {
LL | let a = x.capacity();
LL ~ let b = y.to_owned();
LL ~ let c = y;
|
LL | let b = y.to_string();
| ~~~~~~~~~~~~~
help: change `y.as_str()` to
|
LL | let c = y;
| ~
error: using a reference to `Cow` is not recommended
--> $DIR/ptr_arg.rs:90:25
--> $DIR/ptr_arg.rs:87:25
|
LL | fn test_cow_with_ref(c: &Cow<[i32]>) {}
| ^^^^^^^^^^^ help: change this to: `&[i32]`
error: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices
--> $DIR/ptr_arg.rs:143:21
error: writing `&Vec` instead of `&[_]` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:140:21
|
LL | fn foo_vec(vec: &Vec<u8>) {
| ^^^^^^^^
|
help: change this to
|
LL | fn foo_vec(vec: &[u8]) {
| ~~~~~
help: change `vec.clone()` to
LL ~ fn foo_vec(vec: &[u8]) {
LL ~ let _ = vec.to_owned().pop();
LL ~ let _ = vec.to_owned().clone();
|
LL | let _ = vec.to_owned().pop();
| ~~~~~~~~~~~~~~
help: change `vec.clone()` to
|
LL | let _ = vec.to_owned().clone();
| ~~~~~~~~~~~~~~
error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:148:23
--> $DIR/ptr_arg.rs:145:23
|
LL | fn foo_path(path: &PathBuf) {
| ^^^^^^^^
|
help: change this to
|
LL | fn foo_path(path: &Path) {
| ~~~~~
help: change `path.clone()` to
LL ~ fn foo_path(path: &Path) {
LL ~ let _ = path.to_path_buf().pop();
LL ~ let _ = path.to_path_buf().clone();
|
LL | let _ = path.to_path_buf().pop();
| ~~~~~~~~~~~~~~~~~~
help: change `path.clone()` to
|
LL | let _ = path.to_path_buf().clone();
| ~~~~~~~~~~~~~~~~~~
error: writing `&PathBuf` instead of `&Path` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:153:21
--> $DIR/ptr_arg.rs:150:21
|
LL | fn foo_str(str: &PathBuf) {
| ^^^^^^^^
|
help: change this to
|
LL | fn foo_str(str: &Path) {
| ~~~~~
help: change `str.clone()` to
LL ~ fn foo_str(str: &Path) {
LL ~ let _ = str.to_path_buf().pop();
LL ~ let _ = str.to_path_buf().clone();
|
LL | let _ = str.to_path_buf().pop();
| ~~~~~~~~~~~~~~~~~
help: change `str.clone()` to
error: writing `&mut Vec` instead of `&mut [_]` involves a new object where a slice will do
--> $DIR/ptr_arg.rs:156:29
|
LL | let _ = str.to_path_buf().clone();
| ~~~~~~~~~~~~~~~~~
LL | fn mut_vec_slice_methods(v: &mut Vec<u32>) {
| ^^^^^^^^^^^^^ help: change this to: `&mut [u32]`
error: aborting due to 12 previous errors
error: aborting due to 16 previous errors

2
tests/ui/redundant_pattern_matching_option.fixed
View file

@ -81,7 +81,7 @@ const fn issue6067() {
None::<()>.is_none();
}
#[allow(clippy::deref_addrof, dead_code)]
#[allow(clippy::deref_addrof, dead_code, clippy::needless_borrow)]
fn issue7921() {
if (&None::<()>).is_none() {}
if (&None::<()>).is_none() {}

2
tests/ui/redundant_pattern_matching_option.rs
View file

@ -96,7 +96,7 @@ const fn issue6067() {
};
}
#[allow(clippy::deref_addrof, dead_code)]
#[allow(clippy::deref_addrof, dead_code, clippy::needless_borrow)]
fn issue7921() {
if let None = *(&None::<()>) {}
if let None = *&None::<()> {}

1
tests/ui/rename.fixed
View file

@ -54,6 +54,7 @@
#![warn(clippy::match_result_ok)]
#![warn(clippy::disallowed_types)]
#![warn(clippy::disallowed_methods)]
#![warn(clippy::needless_borrow)]
// uplifted lints
#![warn(invalid_value)]
#![warn(array_into_iter)]

1
tests/ui/rename.rs
View file

@ -54,6 +54,7 @@
#![warn(clippy::if_let_some_result)]
#![warn(clippy::disallowed_type)]
#![warn(clippy::disallowed_method)]
#![warn(clippy::ref_in_deref)]
// uplifted lints
#![warn(clippy::invalid_ref)]
#![warn(clippy::into_iter_on_array)]

26
tests/ui/rename.stderr
View file

@ -138,59 +138,65 @@ error: lint `clippy::disallowed_method` has been renamed to `clippy::disallowed_
LL | #![warn(clippy::disallowed_method)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::disallowed_methods`
error: lint `clippy::ref_in_deref` has been renamed to `clippy::needless_borrow`
--> $DIR/rename.rs:57:9
|
LL | #![warn(clippy::ref_in_deref)]
| ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `clippy::needless_borrow`
error: lint `clippy::invalid_ref` has been renamed to `invalid_value`
--> $DIR/rename.rs:58:9
--> $DIR/rename.rs:59:9
|
LL | #![warn(clippy::invalid_ref)]
| ^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_value`
error: lint `clippy::into_iter_on_array` has been renamed to `array_into_iter`
--> $DIR/rename.rs:59:9
--> $DIR/rename.rs:60:9
|
LL | #![warn(clippy::into_iter_on_array)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `array_into_iter`
error: lint `clippy::unused_label` has been renamed to `unused_labels`
--> $DIR/rename.rs:60:9
--> $DIR/rename.rs:61:9
|
LL | #![warn(clippy::unused_label)]
| ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unused_labels`
error: lint `clippy::drop_bounds` has been renamed to `drop_bounds`
--> $DIR/rename.rs:61:9
--> $DIR/rename.rs:62:9
|
LL | #![warn(clippy::drop_bounds)]
| ^^^^^^^^^^^^^^^^^^^ help: use the new name: `drop_bounds`
error: lint `clippy::temporary_cstring_as_ptr` has been renamed to `temporary_cstring_as_ptr`
--> $DIR/rename.rs:62:9
--> $DIR/rename.rs:63:9
|
LL | #![warn(clippy::temporary_cstring_as_ptr)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `temporary_cstring_as_ptr`
error: lint `clippy::panic_params` has been renamed to `non_fmt_panics`
--> $DIR/rename.rs:63:9
--> $DIR/rename.rs:64:9
|
LL | #![warn(clippy::panic_params)]
| ^^^^^^^^^^^^^^^^^^^^ help: use the new name: `non_fmt_panics`
error: lint `clippy::unknown_clippy_lints` has been renamed to `unknown_lints`
--> $DIR/rename.rs:64:9
--> $DIR/rename.rs:65:9
|
LL | #![warn(clippy::unknown_clippy_lints)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `unknown_lints`
error: lint `clippy::invalid_atomic_ordering` has been renamed to `invalid_atomic_ordering`
--> $DIR/rename.rs:65:9
--> $DIR/rename.rs:66:9
|
LL | #![warn(clippy::invalid_atomic_ordering)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `invalid_atomic_ordering`
error: lint `clippy::mem_discriminant_non_enum` has been renamed to `enum_intrinsics_non_enums`
--> $DIR/rename.rs:66:9
--> $DIR/rename.rs:67:9
|
LL | #![warn(clippy::mem_discriminant_non_enum)]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use the new name: `enum_intrinsics_non_enums`
error: aborting due to 32 previous errors
error: aborting due to 33 previous errors

1
tests/ui/return_self_not_must_use.rs
View file

@ -1,4 +1,5 @@
#![crate_type = "lib"]
#![warn(clippy::return_self_not_must_use)]
#[derive(Clone)]
pub struct Bar;

6
tests/ui/return_self_not_must_use.stderr
View file

@ -1,5 +1,5 @@
error: missing `#[must_use]` attribute on a method returning `Self`
--> $DIR/return_self_not_must_use.rs:7:5
--> $DIR/return_self_not_must_use.rs:8:5
|
LL | fn what(&self) -> Self;
| ^^^^^^^^^^^^^^^^^^^^^^^
@ -8,7 +8,7 @@ LL | fn what(&self) -> Self;
= help: consider adding the `#[must_use]` attribute to the method or directly to the `Self` type
error: missing `#[must_use]` attribute on a method returning `Self`
--> $DIR/return_self_not_must_use.rs:17:5
--> $DIR/return_self_not_must_use.rs:18:5
|
LL | / pub fn foo(&self) -> Self {
LL | | Self
@ -18,7 +18,7 @@ LL | | }
= help: consider adding the `#[must_use]` attribute to the method or directly to the `Self` type
error: missing `#[must_use]` attribute on a method returning `Self`
--> $DIR/return_self_not_must_use.rs:20:5
--> $DIR/return_self_not_must_use.rs:21:5
|
LL | / pub fn bar(self) -> Self {
LL | | self

2
tests/ui/search_is_some_fixable_none.rs
View file

@ -189,7 +189,7 @@ mod issue7392 {
let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|&(&x, y)| x == *y).is_none();
}
fn test_string_1(s: &String) -> bool {
fn test_string_1(s: &str) -> bool {
s.is_empty()
}

10
tests/ui/search_is_some_fixable_none.stderr
View file

@ -251,14 +251,6 @@ error: called `is_none()` after searching an `Iterator` with `find`
LL | let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|&(&x, y)| x == *y).is_none();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `![&(&1, 2), &(&3, 4), &(&5, 4)].iter().any(|(&x, y)| x == *y)`
error: writing `&String` instead of `&str` involves a new object where a slice will do
--> $DIR/search_is_some_fixable_none.rs:192:25
|
LL | fn test_string_1(s: &String) -> bool {
| ^^^^^^^ help: change this to: `&str`
|
= note: `-D clippy::ptr-arg` implied by `-D warnings`
error: called `is_none()` after searching an `Iterator` with `find`
--> $DIR/search_is_some_fixable_none.rs:208:17
|
@ -289,5 +281,5 @@ error: called `is_none()` after searching an `Iterator` with `find`
LL | let _ = v.iter().find(|fp| test_u32_2(*fp.field)).is_none();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `!_.any()` instead: `!v.iter().any(|fp| test_u32_2(*fp.field))`
error: aborting due to 44 previous errors
error: aborting due to 43 previous errors

2
tests/ui/search_is_some_fixable_some.rs
View file

@ -188,7 +188,7 @@ mod issue7392 {
let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|&(&x, y)| x == *y).is_some();
}
fn test_string_1(s: &String) -> bool {
fn test_string_1(s: &str) -> bool {
s.is_empty()
}

10
tests/ui/search_is_some_fixable_some.stderr
View file

@ -234,14 +234,6 @@ error: called `is_some()` after searching an `Iterator` with `find`
LL | let _ = [&(&1, 2), &(&3, 4), &(&5, 4)].iter().find(|&(&x, y)| x == *y).is_some();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|(&x, y)| x == *y)`
error: writing `&String` instead of `&str` involves a new object where a slice will do
--> $DIR/search_is_some_fixable_some.rs:191:25
|
LL | fn test_string_1(s: &String) -> bool {
| ^^^^^^^ help: change this to: `&str`
|
= note: `-D clippy::ptr-arg` implied by `-D warnings`
error: called `is_some()` after searching an `Iterator` with `find`
--> $DIR/search_is_some_fixable_some.rs:207:26
|
@ -272,5 +264,5 @@ error: called `is_some()` after searching an `Iterator` with `find`
LL | let _ = v.iter().find(|fp| test_u32_2(*fp.field)).is_some();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `any()` instead: `any(|fp| test_u32_2(*fp.field))`
error: aborting due to 44 previous errors
error: aborting due to 43 previous errors

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