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Do not ICE when we have fn pointer Fn obligations with bound vars in the self type

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This commit is contained in:
Michael Goulet 2023-03-06 23:30:34 +00:00
parent f63ccaf25f
commit 4fe232b277
3 changed files with 44 additions and 3 deletions
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14
compiler/rustc_trait_selection/src/traits/select/confirmation.rs
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@ -601,10 +601,18 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
debug!(?obligation, "confirm_fn_pointer_candidate");
let tcx = self.tcx();
let self_ty = self
let Some(self_ty) = self
.infcx
.shallow_resolve(obligation.self_ty().no_bound_vars())
.expect("fn pointer should not capture bound vars from predicate");
.shallow_resolve(obligation.self_ty().no_bound_vars()) else
{
// FIXME: Ideally we'd support `for<'a> fn(&'a ()): Fn(&'a ())`,
// but we do not currently. Luckily, such a bound is not
// particularly useful, so we don't expect users to write
// them often.
return Err(SelectionError::Unimplemented);
};
let sig = self_ty.fn_sig(tcx);
let trait_ref = closure_trait_ref_and_return_type(
tcx,