[rustc.git] / src / test / ui / type-alias-impl-trait / issue-63677-type-alias-coherence.rs

// check-pass
// Regression test for issue #63677 - ensure that
// coherence checking can properly handle 'impl trait'
// in type aliases
#![feature(type_alias_impl_trait)]

pub trait Trait {}
pub struct S1<T>(T);
pub struct S2<T>(T);

pub type T1 = impl Trait;
pub type T2 = S1<T1>;
pub type T3 = S2<T2>;

impl<T> Trait for S1<T> {}
impl<T: Trait> S2<T> {}
impl T3 {}

pub fn use_t1() -> T1 { S1(()) }

fn main() {}
Commit	Line	Data
e74abb32 XL	1	// check-pass
	2	// Regression test for issue #63677 - ensure that
	3	// coherence checking can properly handle 'impl trait'
	4	// in type aliases
94222f64	5	#![feature(type_alias_impl_trait)]
e74abb32 XL	6
	7	pub trait Trait {}
	8	pub struct S1<T>(T);
	9	pub struct S2<T>(T);
	10
	11	pub type T1 = impl Trait;
	12	pub type T2 = S1<T1>;
	13	pub type T3 = S2<T2>;
	14
	15	impl<T> Trait for S1<T> {}
	16	impl<T: Trait> S2<T> {}
	17	impl T3 {}
	18
	19	pub fn use_t1() -> T1 { S1(()) }
	20
	21	fn main() {}