diff options
Diffstat (limited to 'tests/ui/specialization/specialization-translate-projections-with-params.rs')
-rw-r--r-- | tests/ui/specialization/specialization-translate-projections-with-params.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/specialization/specialization-translate-projections-with-params.rs b/tests/ui/specialization/specialization-translate-projections-with-params.rs new file mode 100644 index 000000000..62d63590a --- /dev/null +++ b/tests/ui/specialization/specialization-translate-projections-with-params.rs @@ -0,0 +1,32 @@ +// run-pass + +// Ensure that provided items are inherited properly even when impls vary in +// type parameters *and* rely on projections, and the type parameters are input +// types on the trait. + +#![feature(specialization)] //~ WARN the feature `specialization` is incomplete + +trait Trait<T> { + fn convert(&self) -> T; +} +trait WithAssoc { + type Item; + fn as_item(&self) -> &Self::Item; +} + +impl<T, U> Trait<U> for T where T: WithAssoc<Item=U>, U: Clone { + fn convert(&self) -> U { + self.as_item().clone() + } +} + +impl WithAssoc for u8 { + type Item = u8; + fn as_item(&self) -> &u8 { self } +} + +impl Trait<u8> for u8 {} + +fn main() { + assert!(3u8.convert() == 3u8); +} |