Do not ICE on HIR based WF check when involving lifetimes

Fix #87549.
2021-08-06 02:36:54 -07:00
parent d4ad1cfc63
commit f93cbedade
3 changed files with 49 additions and 3 deletions
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
@@ -245,9 +245,10 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
                if let ObligationCauseCode::WellFormed(Some(wf_loc)) =
                    root_obligation.cause.code.peel_derives()
                {
-                    if let Some(cause) =
-                        self.tcx.diagnostic_hir_wf_check((obligation.predicate, wf_loc.clone()))
-                    {
+                    if let Some(cause) = self.tcx.diagnostic_hir_wf_check((
+                        tcx.erase_regions(obligation.predicate),
+                        wf_loc.clone(),
+                    )) {
                        obligation.cause = cause;
                        span = obligation.cause.span;
                    }