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Ignore impl Trait(s)

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This commit is contained in:
blyxyas 2023-04-23 12:05:52 +02:00
parent 928349795f
commit bdd05456b1
No known key found for this signature in database
GPG Key ID: 4D38170B5A2FC334
3 changed files with 24 additions and 16 deletions
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15
clippy_lints/src/let_underscore.rs
View File

@ -1,7 +1,7 @@
use clippy_utils::diagnostics::span_lint_and_help;
use clippy_utils::ty::{implements_trait, is_must_use_ty, match_type};
use clippy_utils::{is_must_use_func_call, paths};
use rustc_hir::{Local, PatKind};
use rustc_hir::{ExprKind, Local, PatKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_middle::lint::in_external_macro;
use rustc_middle::ty::subst::GenericArgKind;
@ -189,7 +189,18 @@ impl<'tcx> LateLintPass<'tcx> for LetUnderscore {
if local.pat.default_binding_modes && local.ty.is_none() {
// When `default_binding_modes` is true, the `let` keyword is present.
span_lint_and_help(
// Ignore function calls that return impl traits...
if let Some(init) = local.init &&
matches!(init.kind, ExprKind::Call(_, _) | ExprKind::MethodCall(_, _, _, _)) {
let expr_ty = cx.typeck_results().expr_ty(init);
if expr_ty.is_impl_trait() {
return;
}
}
span_lint_and_help(
cx,
LET_UNDERSCORE_UNTYPED,
local.span,

5
tests/ui/let_underscore_untyped.rs
View File

@ -28,6 +28,10 @@ fn f() -> Box<dyn Display> {
Box::new(1)
}
fn g() -> impl Fn() {
|| {}
}
fn main() {
let _ = a();
let _ = b(1);
@ -35,6 +39,7 @@ fn main() {
let _ = d(&1);
let _ = e();
let _ = f();
let _ = g();
_ = a();
_ = b(1);

20
tests/ui/let_underscore_untyped.stderr
View File

@ -1,5 +1,5 @@
error: non-binding `let` without a type annotation
--> $DIR/let_underscore_untyped.rs:32:5
--> $DIR/let_underscore_untyped.rs:36:5
|
LL | let _ = a();
| ^^^^^^^^^^^^
@ -8,7 +8,7 @@ LL | let _ = a();
= note: `-D clippy::let-underscore-untyped` implied by `-D warnings`
error: non-binding `let` without a type annotation
--> $DIR/let_underscore_untyped.rs:33:5
--> $DIR/let_underscore_untyped.rs:37:5
|
LL | let _ = b(1);
| ^^^^^^^^^^^^^
@ -16,15 +16,7 @@ LL | let _ = b(1);
= help: consider adding a type annotation or removing the `let` keyword
error: non-binding `let` without a type annotation
--> $DIR/let_underscore_untyped.rs:34:5
|
LL | let _ = c();
| ^^^^^^^^^^^^
|
= help: consider adding a type annotation or removing the `let` keyword
error: non-binding `let` without a type annotation
--> $DIR/let_underscore_untyped.rs:35:5
--> $DIR/let_underscore_untyped.rs:39:5
|
LL | let _ = d(&1);
| ^^^^^^^^^^^^^^
@ -32,7 +24,7 @@ LL | let _ = d(&1);
= help: consider adding a type annotation or removing the `let` keyword
error: non-binding `let` without a type annotation
--> $DIR/let_underscore_untyped.rs:36:5
--> $DIR/let_underscore_untyped.rs:40:5
|
LL | let _ = e();
| ^^^^^^^^^^^^
@ -40,12 +32,12 @@ LL | let _ = e();
= help: consider adding a type annotation or removing the `let` keyword
error: non-binding `let` without a type annotation
--> $DIR/let_underscore_untyped.rs:37:5
--> $DIR/let_underscore_untyped.rs:41:5
|
LL | let _ = f();
| ^^^^^^^^^^^^
|
= help: consider adding a type annotation or removing the `let` keyword
error: aborting due to 6 previous errors
error: aborting due to 5 previous errors