mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-11 08:05:12 +00:00
48 lines
789 B
Rust
48 lines
789 B
Rust
//@ edition:2018
|
|
|
|
// See issue 60414
|
|
|
|
// Reduction to `impl Trait`
|
|
|
|
struct Foo<T>(T);
|
|
|
|
trait FooLike {
|
|
type Output;
|
|
}
|
|
|
|
impl<T> FooLike for Foo<T> {
|
|
type Output = T;
|
|
}
|
|
|
|
mod impl_trait {
|
|
use super::*;
|
|
|
|
trait Trait {
|
|
type Assoc;
|
|
}
|
|
|
|
/// `T::Assoc` can't be normalized any further here.
|
|
fn foo_fail<T: Trait>() -> impl FooLike<Output = T::Assoc> {
|
|
//~^ ERROR: type mismatch
|
|
Foo(())
|
|
}
|
|
}
|
|
|
|
// Same with lifetimes in the trait
|
|
|
|
mod lifetimes {
|
|
use super::*;
|
|
|
|
trait Trait<'a> {
|
|
type Assoc;
|
|
}
|
|
|
|
/// Missing bound constraining `Assoc`, `T::Assoc` can't be normalized further.
|
|
fn foo2_fail<'a, T: Trait<'a>>() -> impl FooLike<Output = T::Assoc> {
|
|
//~^ ERROR: type mismatch
|
|
Foo(())
|
|
}
|
|
}
|
|
|
|
fn main() {}
|