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Diffstat (limited to '')
-rw-r--r-- | tests/ui/traits/new-solver/alias_eq_cant_be_furthur_normalized.rs | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/tests/ui/traits/new-solver/alias_eq_cant_be_furthur_normalized.rs b/tests/ui/traits/new-solver/alias_eq_cant_be_furthur_normalized.rs new file mode 100644 index 000000000..dc726ba51 --- /dev/null +++ b/tests/ui/traits/new-solver/alias_eq_cant_be_furthur_normalized.rs @@ -0,0 +1,29 @@ +// check-pass +// compile-flags: -Ztrait-solver=next + +// check that a goal such as `alias-eq(<T as TraitB>::Assoc<bool>, <T as TraitB>::Assoc<?0>)` +// succeeds with a constraint that `?0 = bool` + +// FIXME(deferred_projection_equality): add a test that this is true during coherence + +trait TraitA {} + +trait TraitB { + type Assoc<T: ?Sized>; +} + +impl<T: TraitB> TraitA for (T, T::Assoc<bool>) {} + +impl TraitB for i32 { + type Assoc<T: ?Sized> = u32; +} + +fn needs_a<T: TraitA>() {} + +fn bar<T: TraitB>() { + needs_a::<(T, <T as TraitB>::Assoc<_>)>(); +} + +fn main() { + bar::<i32>(); +} |