88 lines
1.6 KiB
Rust
88 lines
1.6 KiB
Rust
// check-pass
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// edition:2018
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// revisions: default sa
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//[sa] compile-flags: -Z save-analysis
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//-^ To make this the regression test for #75962.
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#![feature(type_alias_impl_trait)]
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// See issue 60414
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// Reduction to `impl Trait`
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struct Foo<T>(T);
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trait FooLike {
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type Output;
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}
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impl<T> FooLike for Foo<T> {
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type Output = T;
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}
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mod impl_trait {
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use super::*;
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trait Trait {
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type Assoc;
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}
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/// `T::Assoc` should be normalized to `()` here.
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fn foo_pass<T: Trait<Assoc = ()>>() -> impl FooLike<Output = T::Assoc> {
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Foo(())
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}
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}
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// Same with lifetimes in the trait
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mod lifetimes {
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use super::*;
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trait Trait<'a> {
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type Assoc;
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}
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/// Like above.
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///
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/// FIXME(#51525) -- the shorter notation `T::Assoc` winds up referencing `'static` here
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fn foo2_pass<'a, T: Trait<'a, Assoc = ()> + 'a>()
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-> impl FooLike<Output = <T as Trait<'a>>::Assoc> + 'a {
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Foo(())
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}
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/// Normalization to type containing bound region.
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///
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/// FIXME(#51525) -- the shorter notation `T::Assoc` winds up referencing `'static` here
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fn foo2_pass2<'a, T: Trait<'a, Assoc = &'a ()> + 'a>()
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-> impl FooLike<Output = <T as Trait<'a>>::Assoc> + 'a {
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Foo(&())
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}
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}
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// The same applied to `type Foo = impl Bar`s
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mod opaque_types {
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trait Implemented {
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type Assoc;
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}
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impl<T> Implemented for T {
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type Assoc = u8;
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}
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trait Trait {
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type Out;
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}
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impl Trait for () {
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type Out = u8;
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}
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type Ex = impl Trait<Out = <() as Implemented>::Assoc>;
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fn define() -> Ex {
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()
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}
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}
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fn main() {}
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