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Add a regression test

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for #140545
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moxian 2025-05-01 14:34:04 -07:00
parent 1b8ab72680
commit dcee18b3b8
2 changed files with 29 additions and 0 deletions
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12
tests/ui/impl-trait/non-defining-uses/double-wrap-with-defining-use.rs Normal file
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// Regression test for ICE from issue #140545
// The error message is confusing and wrong, but that's a different problem (#139350)
//@ edition:2018
trait Foo {}
fn a(x: impl Foo) -> impl Foo {
if true { x } else { a(a(x)) }
//~^ ERROR: expected generic type parameter, found `impl Foo` [E0792]
//~| ERROR: type parameter `impl Foo` is part of concrete type but not used in parameter list for the `impl Trait` type alias
}
fn main(){}

17
tests/ui/impl-trait/non-defining-uses/double-wrap-with-defining-use.stderr Normal file
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error[E0792]: expected generic type parameter, found `impl Foo`
--> $DIR/double-wrap-with-defining-use.rs:7:26
|
LL | fn a(x: impl Foo) -> impl Foo {
| -------- this generic parameter must be used with a generic type parameter
LL | if true { x } else { a(a(x)) }
| ^^^^^^^
error: type parameter `impl Foo` is part of concrete type but not used in parameter list for the `impl Trait` type alias
--> $DIR/double-wrap-with-defining-use.rs:7:26
|
LL | if true { x } else { a(a(x)) }
| ^^^^^^^
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0792`.