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add lazy normalization regression tests #74364
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18 changes: 18 additions & 0 deletions
18
src/test/ui/lazy_normalization_consts/trait-resolution-breakage.rs
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// check-pass | ||
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trait Trait<T> { | ||
const ASSOC_CONST: usize = 0; | ||
} | ||
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impl Trait<()> for u8 {} | ||
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// `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!() | ||
} | ||
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fn main() {} |
18 changes: 18 additions & 0 deletions
18
src/test/ui/lazy_normalization_consts/unevaluated-consts.rs
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// check-pass | ||
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// If we allow the parent generics here without using lazy normalization | ||
// this results in a cycle error. | ||
struct Foo<T, U>(T, U); | ||
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impl<T> From<[u8; 1 + 1]> for Foo<T, [u8; 1 + 1]> { | ||
fn from(value: [u8; 1 + 1]) -> Foo<T, [u8; 1 + 1]> { | ||
todo!(); | ||
} | ||
} | ||
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fn break_me<T>() | ||
where | ||
[u8; 1 + 1]: From<[u8; 1 + 1]> | ||
{} | ||
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fn main() {} |
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It ought to be ambiguous today, I'd say...
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Yeah, but it compiles on stable 😢 iirc you noted somewhere that this kind of local reasoning should get linted against/slowly phased out. Not completely sure where or when you mentioned that though