mirror of https://github.com/rust-lang/rust
30 lines
1018 B
Rust
30 lines
1018 B
Rust
//@ compile-flags: -Znext-solver
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//@ check-pass
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// With #119106 generalization now results in `AliasRelate` if the generalized
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// alias contains an inference variable which is not nameable.
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//
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// We previously proved alias-relate after canonicalization, which does not keep track
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// of universe indices, so all inference vars were nameable inside of `AliasRelate`.
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//
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// If we now have a rigid projection containing an unnameable inference variable,
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// we should emit an alias-relate obligation, which constrains the type of `x` to
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// an alias. This caused us to emit yet another equivalent alias-relate obligation
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// when trying to instantiate the query result, resulting in overflow.
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trait Trait<'a> {
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type Assoc: Default;
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}
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fn takes_alias<'a, T: Trait<'a>>(_: <T as Trait<'a>>::Assoc) {}
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fn foo<T: for<'a> Trait<'a>>() {
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let x = Default::default();
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let _incr_universe: for<'a, 'b> fn(&'a (), &'b ()) =
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(|&(), &()| ()) as for<'a> fn(&'a (), &'a ());
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takes_alias::<T>(x);
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}
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fn main() {}
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