diff options
Diffstat (limited to 'tests/ui/specialization/defaultimpl/overlap-projection.rs')
-rw-r--r-- | tests/ui/specialization/defaultimpl/overlap-projection.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/tests/ui/specialization/defaultimpl/overlap-projection.rs b/tests/ui/specialization/defaultimpl/overlap-projection.rs new file mode 100644 index 000000000..0add4d551 --- /dev/null +++ b/tests/ui/specialization/defaultimpl/overlap-projection.rs @@ -0,0 +1,25 @@ +// run-pass + +// Test that impls on projected self types can resolve overlap, even when the +// projections involve specialization, so long as the associated type is +// provided by the most specialized impl. + +#![feature(specialization)] //~ WARN the feature `specialization` is incomplete + +trait Assoc { + type Output; +} + +default impl<T> Assoc for T { + type Output = bool; +} + +impl Assoc for u8 { type Output = u8; } +impl Assoc for u16 { type Output = u16; } + +trait Foo {} +impl Foo for u32 {} +impl Foo for <u8 as Assoc>::Output {} +impl Foo for <u16 as Assoc>::Output {} + +fn main() {} |