diff options
Diffstat (limited to 'src/test/ui/traits/trait-upcasting/correct-supertrait-substitution.rs')
-rw-r--r-- | src/test/ui/traits/trait-upcasting/correct-supertrait-substitution.rs | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/test/ui/traits/trait-upcasting/correct-supertrait-substitution.rs b/src/test/ui/traits/trait-upcasting/correct-supertrait-substitution.rs new file mode 100644 index 000000000..8d0a9ef0a --- /dev/null +++ b/src/test/ui/traits/trait-upcasting/correct-supertrait-substitution.rs @@ -0,0 +1,39 @@ +// run-pass +#![feature(trait_upcasting)] +#![allow(incomplete_features)] + +trait Foo<T: Default + ToString>: Bar<i32> + Bar<T> {} +trait Bar<T: Default + ToString> { + fn bar(&self) -> String { + T::default().to_string() + } +} + +struct S1; + +impl Bar<i32> for S1 {} +impl Foo<i32> for S1 {} + +struct S2; +impl Bar<i32> for S2 {} +impl Bar<bool> for S2 {} +impl Foo<bool> for S2 {} + +fn test1(x: &dyn Foo<i32>) { + let s = x as &dyn Bar<i32>; + assert_eq!("0", &s.bar().to_string()); +} + +fn test2(x: &dyn Foo<bool>) { + let p = x as &dyn Bar<i32>; + assert_eq!("0", &p.bar().to_string()); + let q = x as &dyn Bar<bool>; + assert_eq!("false", &q.bar().to_string()); +} + +fn main() { + let s1 = S1; + test1(&s1); + let s2 = S2; + test2(&s2); +} |