diff options
Diffstat (limited to 'src/test/ui/const-generics/backcompat')
-rw-r--r-- | src/test/ui/const-generics/backcompat/trait-resolution-breakage.rs | 18 | ||||
-rw-r--r-- | src/test/ui/const-generics/backcompat/unevaluated-consts.rs | 18 |
2 files changed, 36 insertions, 0 deletions
diff --git a/src/test/ui/const-generics/backcompat/trait-resolution-breakage.rs b/src/test/ui/const-generics/backcompat/trait-resolution-breakage.rs new file mode 100644 index 000000000..df1c99e86 --- /dev/null +++ b/src/test/ui/const-generics/backcompat/trait-resolution-breakage.rs @@ -0,0 +1,18 @@ +// check-pass + +trait Trait<T> { + const ASSOC_CONST: usize = 0; +} + +impl Trait<()> for u8 {} + +// `u8::ASSOC_CONST` is resolved today, but will be ambiguous +// under lazy normalization. +fn foo<T, U>() -> [(T, U); u8::ASSOC_CONST] +where + u8: Trait<T> + Trait<U>, +{ + todo!() +} + +fn main() {} diff --git a/src/test/ui/const-generics/backcompat/unevaluated-consts.rs b/src/test/ui/const-generics/backcompat/unevaluated-consts.rs new file mode 100644 index 000000000..3f90d22ae --- /dev/null +++ b/src/test/ui/const-generics/backcompat/unevaluated-consts.rs @@ -0,0 +1,18 @@ +// check-pass + +// If we allow the parent generics here without using lazy normalization +// this results in a cycle error. +struct Foo<T, U>(T, U); + +impl<T> From<[u8; 1 + 1]> for Foo<T, [u8; 1 + 1]> { + fn from(value: [u8; 1 + 1]) -> Foo<T, [u8; 1 + 1]> { + todo!(); + } +} + +fn break_me<T>() +where + [u8; 1 + 1]: From<[u8; 1 + 1]> +{} + +fn main() {} |