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Don't ICE when computing PointerLike trait when region vars are in param-env

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This commit is contained in:
Michael Goulet
2023-05-23 17:23:25 +00:00
parent 1b67f8b013
commit 3a2710cdb6
5 changed files with 68 additions and 10 deletions
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12
compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs
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@@ -967,16 +967,18 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
) {
// The regions of a type don't affect the size of the type
let tcx = self.tcx();
let self_ty =
tcx.erase_regions(tcx.erase_late_bound_regions(obligation.predicate.self_ty()));
let self_ty = tcx.erase_late_bound_regions(obligation.predicate.self_ty());
// We should erase regions from both the param-env and type, since both
// may have infer regions. Specifically, after canonicalizing and instantiating,
// early bound regions turn into region vars in both the new and old solver.
let key = tcx.erase_regions(obligation.param_env.and(self_ty));
// But if there are inference variables, we have to wait until it's resolved.
if self_ty.has_non_region_infer() {
if key.has_non_region_infer() {
candidates.ambiguous = true;
return;
}
if let Ok(layout) = tcx.layout_of(obligation.param_env.and(self_ty))
if let Ok(layout) = tcx.layout_of(key)
&& layout.layout.is_pointer_like(&tcx.data_layout)
{
candidates.vec.push(BuiltinCandidate { has_nested: false });