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Bail in effects in old solver if self ty is ty var #133323

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Nov 22, 2024
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Bail in effects in old solver if self ty is ty var #133323

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5 changes: 5 additions & 0 deletions compiler/rustc_trait_selection/src/traits/effects.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,11 @@ pub fn evaluate_host_effect_obligation<'tcx>(
);
}

// Force ambiguity for infer self ty.
if obligation.predicate.self_ty().is_ty_var() {
return Err(EvaluationFailure::Ambiguous);
}

match evaluate_host_effect_from_bounds(selcx, obligation) {
Ok(result) => return Ok(result),
Err(EvaluationFailure::Ambiguous) => return Err(EvaluationFailure::Ambiguous),
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16 changes: 16 additions & 0 deletions tests/ui/traits/const-traits/effects/dont-prefer-param-env-for-infer-self-ty.rs
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@@ -0,0 +1,16 @@
//@ check-pass

#![feature(const_trait_impl)]

#[const_trait]
trait Foo {}

impl<T> const Foo for (T,) where T: ~const Foo {}

const fn needs_const_foo(_: impl ~const Foo + Copy) {}

const fn test<T: ~const Foo + Copy>(t: T) {
needs_const_foo((t,));
}

fn main() {}
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