[rustc.git] / src / test / ui / impl-trait / issues / issue-57979-deeply-nested-impl-trait-in-assoc-proj.rs

// rust-lang/rust#57979 : the initial support for `impl Trait` didn't
// properly check syntax hidden behind an associated type projection,
// but it did catch *some cases*. This is checking that we continue to
// properly emit errors for those.
//
// issue-57979-nested-impl-trait-in-assoc-proj.rs shows the main case
// that we were previously failing to catch.

struct Deeper<T>(T);

pub trait Foo<T> { }
pub trait Bar { }
pub trait Quux { type Assoc; }
pub fn demo(_: impl Quux<Assoc=Deeper<impl Foo<impl Bar>>>) { }
//~^ ERROR nested `impl Trait` is not allowed

fn main() { }
Commit	Line	Data
9fa01778 XL	1	// rust-lang/rust#57979 : the initial support for `impl Trait` didn't
	2	// properly check syntax hidden behind an associated type projection,
	3	// but it did catch some cases. This is checking that we continue to
60c5eb7d	4	// properly emit errors for those.
9fa01778 XL	5	//
	6	// issue-57979-nested-impl-trait-in-assoc-proj.rs shows the main case
	7	// that we were previously failing to catch.
	8
	9	struct Deeper<T>(T);
	10
60c5eb7d XL	11	pub trait Foo<T> { }
	12	pub trait Bar { }
	13	pub trait Quux { type Assoc; }
	14	pub fn demo(_: impl Quux<Assoc=Deeper<impl Foo<impl Bar>>>) { }
	15	//~^ ERROR nested `impl Trait` is not allowed
9fa01778 XL	16
9fa01778 XL	17	fn main() { }