diff options
Diffstat (limited to 'tests/ui/impl-trait/equality2.rs')
-rw-r--r-- | tests/ui/impl-trait/equality2.rs | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/tests/ui/impl-trait/equality2.rs b/tests/ui/impl-trait/equality2.rs new file mode 100644 index 000000000..2e325867d --- /dev/null +++ b/tests/ui/impl-trait/equality2.rs @@ -0,0 +1,44 @@ +#![feature(specialization)] //~ WARN the feature `specialization` is incomplete + +trait Foo: Copy + ToString {} + +impl<T: Copy + ToString> Foo for T {} + +fn hide<T: Foo>(x: T) -> impl Foo { + x +} + +trait Leak: Sized { + type T; + fn leak(self) -> Self::T; +} +impl<T> Leak for T { + default type T = (); + default fn leak(self) -> Self::T { panic!() } +} +impl Leak for i32 { + type T = i32; + fn leak(self) -> i32 { self } +} + +fn main() { + let _: u32 = hide(0_u32); + //~^ ERROR mismatched types + //~| expected type `u32` + //~| found opaque type `impl Foo` + //~| expected `u32`, found opaque type + + let _: i32 = Leak::leak(hide(0_i32)); + //~^ ERROR mismatched types + //~| expected type `i32` + //~| found associated type `<impl Foo as Leak>::T` + //~| expected `i32`, found associated type + + let mut x = (hide(0_u32), hide(0_i32)); + x = (x.1, + //~^ ERROR mismatched types + //~| expected `u32`, found `i32` + x.0); + //~^ ERROR mismatched types + //~| expected `i32`, found `u32` +} |