mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-23 13:13:34 +00:00
Merge branch 'master' into option_option_pr
This commit is contained in:
Michael Wright
commit
fca248957b
7 changed files with 163 additions and 54 deletions
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@ -43,7 +43,7 @@ cargo_metadata = "0.2"
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regex = "0.2"
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[dev-dependencies]
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compiletest_rs = "0.3"
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compiletest_rs = "0.3.5"
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duct = "0.8.2"
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lazy_static = "1.0"
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serde_derive = "1.0"
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@ -10,7 +10,9 @@ use utils::{is_adjusted, iter_input_pats, match_qpath, match_trait_method, match
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/// **Why is this bad?** It makes the code less readable than using the
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/// `.cloned()` adapter.
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///
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/// **Known problems:** None.
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/// **Known problems:** Sometimes `.cloned()` requires stricter trait
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/// bound than `.map(|e| e.clone())` (which works because of the coercion).
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/// See [#498](https://github.com/rust-lang-nursery/rust-clippy/issues/498).
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///
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/// **Example:**
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/// ```rust
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@ -6,6 +6,7 @@ use rustc::ty::{self, RegionKind, TypeFoldable};
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use rustc::traits;
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use rustc::middle::expr_use_visitor as euv;
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use rustc::middle::mem_categorization as mc;
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use syntax::abi::Abi;
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use syntax::ast::NodeId;
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use syntax_pos::Span;
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use syntax::errors::DiagnosticBuilder;
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@ -71,13 +72,18 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
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}
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match kind {
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FnKind::ItemFn(.., attrs) => for a in attrs {
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if_chain! {
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if a.meta_item_list().is_some();
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if let Some(name) = a.name();
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if name == "proc_macro_derive";
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then {
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return;
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FnKind::ItemFn(.., abi, _, attrs) => {
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if abi != Abi::Rust {
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return;
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}
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for a in attrs {
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if_chain! {
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if a.meta_item_list().is_some();
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if let Some(name) = a.name();
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if name == "proc_macro_derive";
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then {
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return;
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}
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}
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}
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},
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@ -96,10 +102,11 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
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// Allow `Borrow` or functions to be taken by value
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let borrow_trait = need!(get_trait_def_id(cx, &paths::BORROW_TRAIT));
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let fn_traits = [
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let whitelisted_traits = [
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need!(cx.tcx.lang_items().fn_trait()),
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need!(cx.tcx.lang_items().fn_once_trait()),
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need!(cx.tcx.lang_items().fn_mut_trait()),
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need!(get_trait_def_id(cx, &paths::RANGE_ARGUMENT_TRAIT))
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];
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let sized_trait = need!(cx.tcx.lang_items().sized_trait());
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@ -183,7 +190,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
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if !is_self(arg);
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if !ty.is_mutable_pointer();
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if !is_copy(cx, ty);
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if !fn_traits.iter().any(|&t| implements_trait(cx, ty, t, &[]));
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if !whitelisted_traits.iter().any(|&t| implements_trait(cx, ty, t, &[]));
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if !implements_borrow_trait;
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if !all_borrowable_trait;
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@ -196,6 +203,15 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for NeedlessPassByValue {
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// Dereference suggestion
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let sugg = |db: &mut DiagnosticBuilder| {
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if let ty::TypeVariants::TyAdt(ref def, ..) = ty.sty {
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if let Some(span) = cx.tcx.hir.span_if_local(def.did) {
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let param_env = ty::ParamEnv::empty(traits::Reveal::UserFacing);
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if param_env.can_type_implement_copy(cx.tcx, ty, span).is_ok() {
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db.span_help(span, "consider marking this type as Copy");
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}
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}
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}
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let deref_span = spans_need_deref.get(&canonical_id);
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if_chain! {
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if match_type(cx, ty, &paths::VEC);
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@ -55,6 +55,7 @@ pub const OPTION_SOME: [&str; 4] = ["core", "option", "Option", "Some"];
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pub const PTR_NULL: [&str; 2] = ["ptr", "null"];
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pub const PTR_NULL_MUT: [&str; 2] = ["ptr", "null_mut"];
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pub const RANGE: [&str; 3] = ["core", "ops", "Range"];
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pub const RANGE_ARGUMENT_TRAIT: [&str; 3] = ["alloc", "range", "RangeArgument"];
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pub const RANGE_FROM: [&str; 3] = ["core", "ops", "RangeFrom"];
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pub const RANGE_FROM_STD: [&str; 3] = ["std", "ops", "RangeFrom"];
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pub const RANGE_FULL: [&str; 3] = ["core", "ops", "RangeFull"];
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@ -1,5 +1,8 @@
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#[test]
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fn dogfood() {
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if option_env!("RUSTC_TEST_SUITE").is_some() {
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return;
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}
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let root_dir = std::env::current_dir().unwrap();
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for d in &[".", "clippy_lints"] {
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std::env::set_current_dir(root_dir.join(d)).unwrap();
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@ -4,6 +4,8 @@
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#![warn(needless_pass_by_value)]
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#![allow(dead_code, single_match, if_let_redundant_pattern_matching, many_single_char_names, option_option)]
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#![feature(collections_range)]
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use std::borrow::Borrow;
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use std::convert::AsRef;
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@ -110,4 +112,29 @@ trait FalsePositive {
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}
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}
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// shouldn't warn on extern funcs
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extern "C" fn ext(x: String) -> usize { x.len() }
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// whitelist RangeArgument
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fn range<T: ::std::collections::range::RangeArgument<usize>>(range: T) {
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let _ = range.start();
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}
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struct CopyWrapper(u32);
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fn bar_copy(x: u32, y: CopyWrapper) {
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assert_eq!(x, 42);
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assert_eq!(y.0, 42);
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}
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// x and y should be warned, but z is ok
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fn test_destructure_copy(x: CopyWrapper, y: CopyWrapper, z: CopyWrapper) {
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let CopyWrapper(s) = z; // moved
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let CopyWrapper(ref t) = y; // not moved
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let CopyWrapper(_) = y; // still not moved
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assert_eq!(x.0, s);
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println!("{}", t);
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}
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fn main() {}
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@ -1,128 +1,188 @@
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:12:23
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--> $DIR/needless_pass_by_value.rs:14:23
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12 | fn foo<T: Default>(v: Vec<T>, w: Vec<T>, mut x: Vec<T>, y: Vec<T>) -> Vec<T> {
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14 | fn foo<T: Default>(v: Vec<T>, w: Vec<T>, mut x: Vec<T>, y: Vec<T>) -> Vec<T> {
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| ^^^^^^ help: consider changing the type to: `&[T]`
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= note: `-D needless-pass-by-value` implied by `-D warnings`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:26:11
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--> $DIR/needless_pass_by_value.rs:28:11
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26 | fn bar(x: String, y: Wrapper) {
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28 | fn bar(x: String, y: Wrapper) {
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| ^^^^^^ help: consider changing the type to: `&str`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:26:22
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--> $DIR/needless_pass_by_value.rs:28:22
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26 | fn bar(x: String, y: Wrapper) {
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28 | fn bar(x: String, y: Wrapper) {
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| ^^^^^^^ help: consider taking a reference instead: `&Wrapper`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:32:71
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--> $DIR/needless_pass_by_value.rs:34:71
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32 | fn test_borrow_trait<T: Borrow<str>, U: AsRef<str>, V>(t: T, u: U, v: V) {
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34 | fn test_borrow_trait<T: Borrow<str>, U: AsRef<str>, V>(t: T, u: U, v: V) {
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| ^ help: consider taking a reference instead: `&V`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:44:18
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--> $DIR/needless_pass_by_value.rs:46:18
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44 | fn test_match(x: Option<Option<String>>, y: Option<Option<String>>) {
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46 | fn test_match(x: Option<Option<String>>, y: Option<Option<String>>) {
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| ^^^^^^^^^^^^^^^^^^^^^^
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help: consider taking a reference instead
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44 | fn test_match(x: &Option<Option<String>>, y: Option<Option<String>>) {
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45 | match *x {
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46 | fn test_match(x: &Option<Option<String>>, y: Option<Option<String>>) {
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47 | match *x {
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:57:24
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--> $DIR/needless_pass_by_value.rs:59:24
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57 | fn test_destructure(x: Wrapper, y: Wrapper, z: Wrapper) {
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59 | fn test_destructure(x: Wrapper, y: Wrapper, z: Wrapper) {
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| ^^^^^^^ help: consider taking a reference instead: `&Wrapper`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:57:36
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--> $DIR/needless_pass_by_value.rs:59:36
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57 | fn test_destructure(x: Wrapper, y: Wrapper, z: Wrapper) {
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59 | fn test_destructure(x: Wrapper, y: Wrapper, z: Wrapper) {
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| ^^^^^^^
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help: consider taking a reference instead
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|
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57 | fn test_destructure(x: Wrapper, y: &Wrapper, z: Wrapper) {
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58 | let Wrapper(s) = z; // moved
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59 | let Wrapper(ref t) = *y; // not moved
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60 | let Wrapper(_) = *y; // still not moved
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59 | fn test_destructure(x: Wrapper, y: &Wrapper, z: Wrapper) {
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60 | let Wrapper(s) = z; // moved
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61 | let Wrapper(ref t) = *y; // not moved
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62 | let Wrapper(_) = *y; // still not moved
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|
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:73:49
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--> $DIR/needless_pass_by_value.rs:75:49
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|
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73 | fn test_blanket_ref<T: Foo, S: Serialize>(_foo: T, _serializable: S) {}
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75 | fn test_blanket_ref<T: Foo, S: Serialize>(_foo: T, _serializable: S) {}
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| ^ help: consider taking a reference instead: `&T`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:75:18
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--> $DIR/needless_pass_by_value.rs:77:18
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|
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75 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: Vec<i32>) {
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77 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: Vec<i32>) {
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| ^^^^^^ help: consider taking a reference instead: `&String`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:75:29
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--> $DIR/needless_pass_by_value.rs:77:29
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|
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75 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: Vec<i32>) {
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77 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: Vec<i32>) {
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| ^^^^^^
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help: consider changing the type to
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|
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75 | fn issue_2114(s: String, t: &str, u: Vec<i32>, v: Vec<i32>) {
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77 | fn issue_2114(s: String, t: &str, u: Vec<i32>, v: Vec<i32>) {
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| ^^^^
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help: change `t.clone()` to
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|
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77 | let _ = t.to_string();
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79 | let _ = t.to_string();
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| ^^^^^^^^^^^^^
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:75:40
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--> $DIR/needless_pass_by_value.rs:77:40
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|
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75 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: Vec<i32>) {
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77 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: Vec<i32>) {
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| ^^^^^^^^ help: consider taking a reference instead: `&Vec<i32>`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:75:53
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--> $DIR/needless_pass_by_value.rs:77:53
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|
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75 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: Vec<i32>) {
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77 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: Vec<i32>) {
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| ^^^^^^^^
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help: consider changing the type to
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|
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75 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: &[i32]) {
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77 | fn issue_2114(s: String, t: String, u: Vec<i32>, v: &[i32]) {
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| ^^^^^^
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help: change `v.clone()` to
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|
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79 | let _ = v.to_owned();
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81 | let _ = v.to_owned();
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| ^^^^^^^^^^^^
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:87:12
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--> $DIR/needless_pass_by_value.rs:89:12
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|
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87 | s: String,
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89 | s: String,
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| ^^^^^^ help: consider changing the type to: `&str`
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error: this argument is passed by value, but not consumed in the function body
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--> $DIR/needless_pass_by_value.rs:88:12
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--> $DIR/needless_pass_by_value.rs:90:12
|
||||
|
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88 | t: String,
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90 | t: String,
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| ^^^^^^ help: consider taking a reference instead: `&String`
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||||
error: this argument is passed by value, but not consumed in the function body
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||||
--> $DIR/needless_pass_by_value.rs:100:13
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--> $DIR/needless_pass_by_value.rs:102:13
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||||
|
|
||||
100 | _u: U,
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102 | _u: U,
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||||
| ^ help: consider taking a reference instead: `&U`
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||||
|
||||
error: this argument is passed by value, but not consumed in the function body
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||||
--> $DIR/needless_pass_by_value.rs:101:13
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||||
--> $DIR/needless_pass_by_value.rs:103:13
|
||||
|
|
||||
101 | _s: Self,
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||||
103 | _s: Self,
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||||
| ^^^^ help: consider taking a reference instead: `&Self`
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||||
|
||||
error: aborting due to 16 previous errors
|
||||
error: this argument is passed by value, but not consumed in the function body
|
||||
--> $DIR/needless_pass_by_value.rs:125:24
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||||
|
|
||||
125 | fn bar_copy(x: u32, y: CopyWrapper) {
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||||
| ^^^^^^^^^^^ help: consider taking a reference instead: `&CopyWrapper`
|
||||
|
|
||||
help: consider marking this type as Copy
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||||
--> $DIR/needless_pass_by_value.rs:123:1
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||||
|
|
||||
123 | struct CopyWrapper(u32);
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||||
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: this argument is passed by value, but not consumed in the function body
|
||||
--> $DIR/needless_pass_by_value.rs:131:29
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||||
|
|
||||
131 | fn test_destructure_copy(x: CopyWrapper, y: CopyWrapper, z: CopyWrapper) {
|
||||
| ^^^^^^^^^^^ help: consider taking a reference instead: `&CopyWrapper`
|
||||
|
|
||||
help: consider marking this type as Copy
|
||||
--> $DIR/needless_pass_by_value.rs:123:1
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||||
|
|
||||
123 | struct CopyWrapper(u32);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: this argument is passed by value, but not consumed in the function body
|
||||
--> $DIR/needless_pass_by_value.rs:131:45
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||||
|
|
||||
131 | fn test_destructure_copy(x: CopyWrapper, y: CopyWrapper, z: CopyWrapper) {
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||||
| ^^^^^^^^^^^
|
||||
|
|
||||
help: consider marking this type as Copy
|
||||
--> $DIR/needless_pass_by_value.rs:123:1
|
||||
|
|
||||
123 | struct CopyWrapper(u32);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
help: consider taking a reference instead
|
||||
|
|
||||
131 | fn test_destructure_copy(x: CopyWrapper, y: &CopyWrapper, z: CopyWrapper) {
|
||||
132 | let CopyWrapper(s) = z; // moved
|
||||
133 | let CopyWrapper(ref t) = *y; // not moved
|
||||
134 | let CopyWrapper(_) = *y; // still not moved
|
||||
|
|
||||
|
||||
error: this argument is passed by value, but not consumed in the function body
|
||||
--> $DIR/needless_pass_by_value.rs:131:61
|
||||
|
|
||||
131 | fn test_destructure_copy(x: CopyWrapper, y: CopyWrapper, z: CopyWrapper) {
|
||||
| ^^^^^^^^^^^
|
||||
|
|
||||
help: consider marking this type as Copy
|
||||
--> $DIR/needless_pass_by_value.rs:123:1
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||||
|
|
||||
123 | struct CopyWrapper(u32);
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
help: consider taking a reference instead
|
||||
|
|
||||
131 | fn test_destructure_copy(x: CopyWrapper, y: CopyWrapper, z: &CopyWrapper) {
|
||||
132 | let CopyWrapper(s) = *z; // moved
|
||||
|
|
||||
|
||||
error: aborting due to 20 previous errors
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue