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Don't lint path statements in no_effect

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Alex Macleod 2024-05-14 17:22:56 +00:00
parent a86378086b
commit 9d790d6407
3 changed files with 33 additions and 56 deletions
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8
clippy_lints/src/no_effect.rs
View file

@ -94,7 +94,6 @@ impl<'tcx> LateLintPass<'tcx> for NoEffect {
fn check_block_post(&mut self, cx: &LateContext<'tcx>, _: &'tcx rustc_hir::Block<'tcx>) { fn check_block_post(&mut self, cx: &LateContext<'tcx>, _: &'tcx rustc_hir::Block<'tcx>) {
for hir_id in self.local_bindings.pop().unwrap() { for hir_id in self.local_bindings.pop().unwrap() {
// FIXME(rust/#120456) - is `swap_remove` correct?
if let Some(span) = self.underscore_bindings.swap_remove(&hir_id) { if let Some(span) = self.underscore_bindings.swap_remove(&hir_id) {
span_lint_hir( span_lint_hir(
cx, cx,
@ -109,7 +108,6 @@ impl<'tcx> LateLintPass<'tcx> for NoEffect {
fn check_expr(&mut self, _: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) { fn check_expr(&mut self, _: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) {
if let Some(def_id) = path_to_local(expr) { if let Some(def_id) = path_to_local(expr) {
// FIXME(rust/#120456) - is `swap_remove` correct?
self.underscore_bindings.swap_remove(&def_id); self.underscore_bindings.swap_remove(&def_id);
} }
} }
@ -118,7 +116,11 @@ impl<'tcx> LateLintPass<'tcx> for NoEffect {
impl NoEffect { impl NoEffect {
fn check_no_effect(&mut self, cx: &LateContext<'_>, stmt: &Stmt<'_>) -> bool { fn check_no_effect(&mut self, cx: &LateContext<'_>, stmt: &Stmt<'_>) -> bool {
if let StmtKind::Semi(expr) = stmt.kind { if let StmtKind::Semi(expr) = stmt.kind {
// move `expr.span.from_expansion()` ahead // Covered by rustc `path_statements` lint
if matches!(expr.kind, ExprKind::Path(_)) {
return true;
}
if expr.span.from_expansion() { if expr.span.from_expansion() {
return false; return false;
} }

13
tests/ui/no_effect.rs
View file

@ -1,6 +1,5 @@
#![feature(fn_traits, unboxed_closures)] #![feature(fn_traits, unboxed_closures)]
#![warn(clippy::no_effect_underscore_binding)] #![warn(clippy::no_effect_underscore_binding)]
#![allow(dead_code, path_statements)]
#![allow( #![allow(
clippy::deref_addrof, clippy::deref_addrof,
clippy::redundant_field_names, clippy::redundant_field_names,
@ -33,7 +32,6 @@ impl Neg for Cout {
} }
} }
struct Unit;
struct Tuple(i32); struct Tuple(i32);
struct Struct { struct Struct {
field: i32, field: i32,
@ -42,10 +40,6 @@ enum Enum {
Tuple(i32), Tuple(i32),
Struct { field: i32 }, Struct { field: i32 },
} }
struct DropUnit;
impl Drop for DropUnit {
fn drop(&mut self) {}
}
struct DropStruct { struct DropStruct {
field: i32, field: i32,
} }
@ -117,15 +111,9 @@ impl FnOnce<(&str,)> for GreetStruct3 {
fn main() { fn main() {
let s = get_struct(); let s = get_struct();
let s2 = get_struct();
0; 0;
//~^ ERROR: statement with no effect //~^ ERROR: statement with no effect
//~| NOTE: `-D clippy::no-effect` implied by `-D warnings`
s2;
//~^ ERROR: statement with no effect
Unit;
//~^ ERROR: statement with no effect
Tuple(0); Tuple(0);
//~^ ERROR: statement with no effect //~^ ERROR: statement with no effect
Struct { field: 0 }; Struct { field: 0 };
@ -192,7 +180,6 @@ fn main() {
unsafe { unsafe_fn() }; unsafe { unsafe_fn() };
let _used = get_struct(); let _used = get_struct();
let _x = vec![1]; let _x = vec![1];
DropUnit;
DropStruct { field: 0 }; DropStruct { field: 0 };
DropTuple(0); DropTuple(0);
DropEnum::Tuple(0); DropEnum::Tuple(0);

68
tests/ui/no_effect.stderr
View file

@ -1,5 +1,5 @@
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:122:5 --> tests/ui/no_effect.rs:115:5
| |
LL | 0; LL | 0;
| ^^ | ^^
@ -8,151 +8,139 @@ LL | 0;
= help: to override `-D warnings` add `#[allow(clippy::no_effect)]` = help: to override `-D warnings` add `#[allow(clippy::no_effect)]`
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:125:5 --> tests/ui/no_effect.rs:117:5
|
LL | s2;
| ^^^
error: statement with no effect
--> tests/ui/no_effect.rs:127:5
|
LL | Unit;
| ^^^^^
error: statement with no effect
--> tests/ui/no_effect.rs:129:5
| |
LL | Tuple(0); LL | Tuple(0);
| ^^^^^^^^^ | ^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:131:5 --> tests/ui/no_effect.rs:119:5
| |
LL | Struct { field: 0 }; LL | Struct { field: 0 };
| ^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:133:5 --> tests/ui/no_effect.rs:121:5
| |
LL | Struct { ..s }; LL | Struct { ..s };
| ^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:135:5 --> tests/ui/no_effect.rs:123:5
| |
LL | Union { a: 0 }; LL | Union { a: 0 };
| ^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:137:5 --> tests/ui/no_effect.rs:125:5
| |
LL | Enum::Tuple(0); LL | Enum::Tuple(0);
| ^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:139:5 --> tests/ui/no_effect.rs:127:5
| |
LL | Enum::Struct { field: 0 }; LL | Enum::Struct { field: 0 };
| ^^^^^^^^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:141:5 --> tests/ui/no_effect.rs:129:5
| |
LL | 5 + 6; LL | 5 + 6;
| ^^^^^^ | ^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:143:5 --> tests/ui/no_effect.rs:131:5
| |
LL | *&42; LL | *&42;
| ^^^^^ | ^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:145:5 --> tests/ui/no_effect.rs:133:5
| |
LL | &6; LL | &6;
| ^^^ | ^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:147:5 --> tests/ui/no_effect.rs:135:5
| |
LL | (5, 6, 7); LL | (5, 6, 7);
| ^^^^^^^^^^ | ^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:149:5 --> tests/ui/no_effect.rs:137:5
| |
LL | ..; LL | ..;
| ^^^ | ^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:151:5 --> tests/ui/no_effect.rs:139:5
| |
LL | 5..; LL | 5..;
| ^^^^ | ^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:153:5 --> tests/ui/no_effect.rs:141:5
| |
LL | ..5; LL | ..5;
| ^^^^ | ^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:155:5 --> tests/ui/no_effect.rs:143:5
| |
LL | 5..6; LL | 5..6;
| ^^^^^ | ^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:157:5 --> tests/ui/no_effect.rs:145:5
| |
LL | 5..=6; LL | 5..=6;
| ^^^^^^ | ^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:159:5 --> tests/ui/no_effect.rs:147:5
| |
LL | [42, 55]; LL | [42, 55];
| ^^^^^^^^^ | ^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:161:5 --> tests/ui/no_effect.rs:149:5
| |
LL | [42, 55][1]; LL | [42, 55][1];
| ^^^^^^^^^^^^ | ^^^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:163:5 --> tests/ui/no_effect.rs:151:5
| |
LL | (42, 55).1; LL | (42, 55).1;
| ^^^^^^^^^^^ | ^^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:165:5 --> tests/ui/no_effect.rs:153:5
| |
LL | [42; 55]; LL | [42; 55];
| ^^^^^^^^^ | ^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:167:5 --> tests/ui/no_effect.rs:155:5
| |
LL | [42; 55][13]; LL | [42; 55][13];
| ^^^^^^^^^^^^^ | ^^^^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:170:5 --> tests/ui/no_effect.rs:158:5
| |
LL | || x += 5; LL | || x += 5;
| ^^^^^^^^^^ | ^^^^^^^^^^
error: statement with no effect error: statement with no effect
--> tests/ui/no_effect.rs:173:5 --> tests/ui/no_effect.rs:161:5
| |
LL | FooString { s: s }; LL | FooString { s: s };
| ^^^^^^^^^^^^^^^^^^^ | ^^^^^^^^^^^^^^^^^^^
error: binding to `_` prefixed variable with no side-effect error: binding to `_` prefixed variable with no side-effect
--> tests/ui/no_effect.rs:175:9 --> tests/ui/no_effect.rs:163:9
| |
LL | let _unused = 1; LL | let _unused = 1;
| ^^^^^^^ | ^^^^^^^
@ -161,22 +149,22 @@ LL | let _unused = 1;
= help: to override `-D warnings` add `#[allow(clippy::no_effect_underscore_binding)]` = help: to override `-D warnings` add `#[allow(clippy::no_effect_underscore_binding)]`
error: binding to `_` prefixed variable with no side-effect error: binding to `_` prefixed variable with no side-effect
--> tests/ui/no_effect.rs:178:9 --> tests/ui/no_effect.rs:166:9
| |
LL | let _penguin = || println!("Some helpful closure"); LL | let _penguin = || println!("Some helpful closure");
| ^^^^^^^^ | ^^^^^^^^
error: binding to `_` prefixed variable with no side-effect error: binding to `_` prefixed variable with no side-effect
--> tests/ui/no_effect.rs:180:9 --> tests/ui/no_effect.rs:168:9
| |
LL | let _duck = Struct { field: 0 }; LL | let _duck = Struct { field: 0 };
| ^^^^^ | ^^^^^
error: binding to `_` prefixed variable with no side-effect error: binding to `_` prefixed variable with no side-effect
--> tests/ui/no_effect.rs:182:9 --> tests/ui/no_effect.rs:170:9
| |
LL | let _cat = [2, 4, 6, 8][2]; LL | let _cat = [2, 4, 6, 8][2];
| ^^^^ | ^^^^
error: aborting due to 29 previous errors error: aborting due to 27 previous errors