Don't run generator transform when there's a TyErr

rust-lang · Jun 14, 2020 · 4004bf1 · 4004bf1
1 parent 06e4768
commit 4004bf1
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/src/librustc_mir/transform/generator.rs b/src/librustc_mir/transform/generator.rs
@@ -1222,7 +1222,11 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
                     movability == hir::Movability::Movable,
                 )
             }
-            _ => bug!(),
+            _ => {
+                tcx.sess
+                    .delay_span_bug(body.span, &format!("unexpected generator type {}", gen_ty));
+                return;
+            }
         };
 
         // Compute GeneratorState<yield_ty, return_ty>