Auto merge of rust-lang#107652 - estebank:re_error, r=oli-obk

Introduce `ReError`

CC rust-lang#69314

r? `@nagisa`

Author: bors

compiler/rustc_borrowck/src/diagnostics/region_name.rs

@@ -343,11 +343,11 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                     let note = match closure_kind_ty.to_opt_closure_kind() {
                         Some(ty::ClosureKind::Fn) => {
                             "closure implements `Fn`, so references to captured variables \
-                                can't escape the closure"
+                             can't escape the closure"
                         }
                         Some(ty::ClosureKind::FnMut) => {
                             "closure implements `FnMut`, so references to captured variables \
-                                can't escape the closure"
+                             can't escape the closure"
                         }
                         Some(ty::ClosureKind::FnOnce) => {
                             bug!("BrEnv in a `FnOnce` closure");
@@ -364,7 +364,11 @@ impl<'tcx> MirBorrowckCtxt<'_, 'tcx> {
                 ty::BoundRegionKind::BrAnon(..) => None,
             },
 
-            ty::ReLateBound(..) | ty::ReVar(..) | ty::RePlaceholder(..) | ty::ReErased => None,
+            ty::ReLateBound(..)
+            | ty::ReVar(..)
+            | ty::RePlaceholder(..)
+            | ty::ReErased
+            | ty::ReError(_) => None,
         }
     }
 

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -91,11 +91,10 @@ impl<'tcx> RegionInferenceContext<'tcx> {
                     }
                     None => {
                         subst_regions.push(vid);
-                        infcx.tcx.sess.delay_span_bug(
+                        infcx.tcx.re_error_with_message(
                             concrete_type.span,
                             "opaque type with non-universal region substs",
-                        );
-                        infcx.tcx.lifetimes.re_static
+                        )
                     }
                 }
             };