diff options
Diffstat (limited to 'tests/ui/associated-type-bounds/trait-alias-impl-trait.rs')
-rw-r--r-- | tests/ui/associated-type-bounds/trait-alias-impl-trait.rs | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/tests/ui/associated-type-bounds/trait-alias-impl-trait.rs b/tests/ui/associated-type-bounds/trait-alias-impl-trait.rs new file mode 100644 index 000000000..e223a8957 --- /dev/null +++ b/tests/ui/associated-type-bounds/trait-alias-impl-trait.rs @@ -0,0 +1,96 @@ +// run-pass + +#![feature(associated_type_bounds)] +#![feature(type_alias_impl_trait)] + +use std::ops::Add; + +trait Tr1 { + type As1; + fn mk(self) -> Self::As1; +} +trait Tr2<'a> { + fn tr2(self) -> &'a Self; +} + +fn assert_copy<T: Copy>(x: T) { + let _x = x; + let _x = x; +} +fn assert_static<T: 'static>(_: T) {} +fn assert_forall_tr2<T: for<'a> Tr2<'a>>(_: T) {} + +struct S1; +#[derive(Copy, Clone)] +struct S2; +impl Tr1 for S1 { + type As1 = S2; + fn mk(self) -> Self::As1 { + S2 + } +} + +type Et1 = impl Tr1<As1: Copy>; +fn def_et1() -> Et1 { + S1 +} +pub fn use_et1() { + assert_copy(def_et1().mk()); +} + +type Et2 = impl Tr1<As1: 'static>; +fn def_et2() -> Et2 { + S1 +} +pub fn use_et2() { + assert_static(def_et2().mk()); +} + +type Et3 = impl Tr1<As1: Clone + Iterator<Item: Add<u8, Output: Into<u8>>>>; +fn def_et3() -> Et3 { + struct A; + impl Tr1 for A { + type As1 = core::ops::Range<u8>; + fn mk(self) -> Self::As1 { + 0..10 + } + } + A +} +pub fn use_et3() { + let _0 = def_et3().mk().clone(); + let mut s = 0u8; + for _1 in _0 { + let _2 = _1 + 1u8; + s += _2.into(); + } + assert_eq!(s, (0..10).map(|x| x + 1).sum()); +} + +type Et4 = impl Tr1<As1: for<'a> Tr2<'a>>; +fn def_et4() -> Et4 { + #[derive(Copy, Clone)] + struct A; + impl Tr1 for A { + type As1 = A; + fn mk(self) -> A { + A + } + } + impl<'a> Tr2<'a> for A { + fn tr2(self) -> &'a Self { + &A + } + } + A +} +pub fn use_et4() { + assert_forall_tr2(def_et4().mk()); +} + +fn main() { + let _ = use_et1(); + let _ = use_et2(); + let _ = use_et3(); + let _ = use_et4(); +} |