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

jonas-schievink · jonas-schievink · commit 4004bf19035b · 2020-06-14T13:20:13.000+02:00
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>

Original file line number	Diff line number	Diff line change
`@@ -1222,7 +1222,11 @@ impl<'tcx> MirPass<'tcx> for StateTransform {`
`1222`	`1222`	`movability == hir::Movability::Movable,`
`1223`	`1223`	`)`
`1224`	`1224`	`}`
`1225`		`- _ => bug!(),`
	`1225`	`+ _ => {`
	`1226`	`+ tcx.sess`
	`1227`	`+ .delay_span_bug(body.span, &format!("unexpected generator type {}", gen_ty));`
	`1228`	`+ return;`
	`1229`	`+ }`
`1226`	`1230`	`};`
`1227`	`1231`
`1228`	`1232`	`// Compute GeneratorState<yield_ty, return_ty>`