diff options
| -rw-r--r-- | compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs | 5 | ||||
| -rw-r--r-- | tests/ui/higher-ranked/leak-check-in-selection.rs | 24 |
2 files changed, 29 insertions, 0 deletions
diff --git a/compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs b/compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs index fdb209fbff8..91a093f30bd 100644 --- a/compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs +++ b/compiler/rustc_trait_selection/src/solve/eval_ctxt/canonical.rs @@ -137,6 +137,11 @@ impl<'tcx> EvalCtxt<'_, 'tcx> { #[instrument(level = "debug", skip(self), ret)] fn compute_external_query_constraints(&self) -> Result<ExternalConstraints<'tcx>, NoSolution> { + self.infcx.leak_check(ty::UniverseIndex::ROOT, None).map_err(|e| { + debug!(?e, "failed the leak check"); + NoSolution + })?; + // Cannot use `take_registered_region_obligations` as we may compute the response // inside of a `probe` whenever we have multiple choices inside of the solver. let region_obligations = self.infcx.inner.borrow().region_obligations().to_owned(); diff --git a/tests/ui/higher-ranked/leak-check-in-selection.rs b/tests/ui/higher-ranked/leak-check-in-selection.rs new file mode 100644 index 00000000000..e8d6cff856c --- /dev/null +++ b/tests/ui/higher-ranked/leak-check-in-selection.rs @@ -0,0 +1,24 @@ +// run-pass +// revisions: old next +//[next] compile-flags: -Ztrait-solver=next +#![allow(coherence_leak_check)] + +trait Trait: Sized { + fn is_higher_ranked(self) -> bool; +} + +impl Trait for for<'a> fn(&'a ()) { + fn is_higher_ranked(self) -> bool { + true + } +} +impl<'a> Trait for fn(&'a ()) { + fn is_higher_ranked(self) -> bool { + false + } +} + +fn main() { + let x: for<'a> fn(&'a ()) = |&()| (); + assert!(x.is_higher_ranked()); +} |