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Diffstat (limited to 'tests/ui/traits/reservation-impl/ok.rs')
-rw-r--r-- | tests/ui/traits/reservation-impl/ok.rs | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tests/ui/traits/reservation-impl/ok.rs b/tests/ui/traits/reservation-impl/ok.rs new file mode 100644 index 000000000..611c8d884 --- /dev/null +++ b/tests/ui/traits/reservation-impl/ok.rs @@ -0,0 +1,28 @@ +// run-pass + +// rpass test for reservation impls. Not 100% required because `From` uses them, +// but still. + +#![feature(rustc_attrs)] + +use std::mem; + +trait MyTrait<S> { + fn foo(&self, s: S) -> usize; +} + +#[rustc_reservation_impl = "foo"] +impl<T> MyTrait<u64> for T { + fn foo(&self, _x: u64) -> usize { 0 } +} + +// reservation impls don't create coherence conflicts, even with +// non-chain overlap. +impl<S> MyTrait<S> for u32 { + fn foo(&self, _x: S) -> usize { mem::size_of::<S>() } +} + +fn main() { + // ...and the non-reservation impl gets picked.XS + assert_eq!(0u32.foo(0u64), mem::size_of::<u64>()); +} |