diff options
Diffstat (limited to 'tests/ui/traits/trait-upcasting/type-checking-test-1.rs')
-rw-r--r-- | tests/ui/traits/trait-upcasting/type-checking-test-1.rs | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/tests/ui/traits/trait-upcasting/type-checking-test-1.rs b/tests/ui/traits/trait-upcasting/type-checking-test-1.rs new file mode 100644 index 000000000..6bc9f4a75 --- /dev/null +++ b/tests/ui/traits/trait-upcasting/type-checking-test-1.rs @@ -0,0 +1,26 @@ +#![feature(trait_upcasting)] + +trait Foo: Bar<i32> + Bar<u32> {} +trait Bar<T> { + fn bar(&self) -> Option<T> { + None + } +} + +fn test_specific(x: &dyn Foo) { + let _ = x as &dyn Bar<i32>; // OK + let _ = x as &dyn Bar<u32>; // OK +} + +fn test_unknown_version(x: &dyn Foo) { + let _ = x as &dyn Bar<_>; // Ambiguous + //~^ ERROR non-primitive cast + //~^^ ERROR the trait bound `&dyn Foo: Bar<_>` is not satisfied +} + +fn test_infer_version(x: &dyn Foo) { + let a = x as &dyn Bar<_>; // OK + let _: Option<u32> = a.bar(); +} + +fn main() {} |