mirror of https://github.com/rust-lang/rust.git
36 lines
732 B
Rust
36 lines
732 B
Rust
//@ revisions: current next
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//@ ignore-compare-mode-next-solver (explicit revisions)
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//@[next] compile-flags: -Znext-solver
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// A regression test for #105787
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#![feature(type_alias_impl_trait)]
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pub type Alias<T> = impl Sized;
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#[define_opaque(Alias)]
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pub fn cast<T>(x: Container<Alias<T>, T>) -> Container<T, T> {
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//[next]~^ ERROR type annotations needed
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x
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}
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struct Container<T: Trait<U>, U> {
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x: <T as Trait<U>>::Assoc,
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}
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trait Trait<T> {
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type Assoc;
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}
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impl<T> Trait<T> for T {
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type Assoc = Box<u32>;
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}
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impl<T> Trait<T> for Alias<T> {
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//~^ ERROR conflicting implementations of trait
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type Assoc = usize;
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}
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fn main() {
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let x: Box<u32> = cast::<()>(Container { x: 0 }).x;
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println!("{}", *x);
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}
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