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Add a missing test case for impl generic mismatch #100945

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Aug 24, 2022
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Add a missing test case for impl generic mismatch #100945

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9 changes: 9 additions & 0 deletions src/test/ui/impl-trait/impl-generic-mismatch.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,15 @@ impl Bar for () {
//~^ Error method `bar` has incompatible signature for trait
}

trait Baz {
fn baz<U: Debug, T: Debug>(&self, _: &U, _: &T);
}

impl Baz for () {
fn baz<T: Debug>(&self, _: &impl Debug, _: &T) { }
//~^ Error method `baz` has incompatible signature for trait
}

// With non-local trait (#49841):

use std::hash::{Hash, Hasher};
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18 changes: 16 additions & 2 deletions src/test/ui/impl-trait/impl-generic-mismatch.stderr
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Expand Up @@ -27,8 +27,22 @@ help: try changing the `impl Trait` argument to a generic parameter
LL | fn bar<U: Debug>(&self, _: &U) { }
| ++++++++++ ~

error[E0643]: method `baz` has incompatible signature for trait
--> $DIR/impl-generic-mismatch.rs:26:33
|
LL | fn baz<U: Debug, T: Debug>(&self, _: &U, _: &T);
| - declaration in trait here
...
LL | fn baz<T: Debug>(&self, _: &impl Debug, _: &T) { }
| ^^^^^^^^^^ expected generic parameter, found `impl Trait`
|
help: try changing the `impl Trait` argument to a generic parameter
|
LL | fn baz<U: Debug, T: Debug>(&self, _: &T, _: &T) { }
| ~~~~~~~~~~~~~~~~~~~~ ~

error[E0643]: method `hash` has incompatible signature for trait
--> $DIR/impl-generic-mismatch.rs:28:33
--> $DIR/impl-generic-mismatch.rs:37:33
|
LL | fn hash(&self, hasher: &mut impl Hasher) {}
| ^^^^^^^^^^^ expected generic parameter, found `impl Trait`
Expand All @@ -38,6 +52,6 @@ LL | fn hash(&self, hasher: &mut impl Hasher) {}
LL | fn hash<H: Hasher>(&self, state: &mut H);
| - declaration in trait here

error: aborting due to 3 previous errors
error: aborting due to 4 previous errors

For more information about this error, try `rustc --explain E0643`.