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Require any function with a tait in its signature to actually constrain a hidden type

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This commit is contained in:
Oli Scherer 2024-06-10 16:17:38 +00:00
parent 0eb782ba13
commit 4e0af7cc61
1 changed files with 13 additions and 10 deletions
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17
example/issue-72793.rs
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@ -2,20 +2,23 @@
#![feature(type_alias_impl_trait)] #![feature(type_alias_impl_trait)]
trait T { mod helper {
pub trait T {
type Item; type Item;
} }
type Alias<'a> = impl T<Item = &'a ()>; pub type Alias<'a> = impl T<Item = &'a ()>;
struct S; struct S;
impl<'a> T for &'a S { impl<'a> T for &'a S {
type Item = &'a (); type Item = &'a ();
} }
fn filter_positive<'a>() -> Alias<'a> { pub fn filter_positive<'a>() -> Alias<'a> {
&S &S
}
} }
use helper::*;
fn with_positive(fun: impl Fn(Alias<'_>)) { fn with_positive(fun: impl Fn(Alias<'_>)) {
fun(filter_positive()); fun(filter_positive());