dart2js: type analysis: yield escapes its argument

pkg/compiler/lib/src/inferrer/node_tracer.dart

Index: pkg/compiler/lib/src/inferrer/node_tracer.dart
diff --git a/pkg/compiler/lib/src/inferrer/node_tracer.dart b/pkg/compiler/lib/src/inferrer/node_tracer.dart
index f3fdc407c644b5c2e71587e0ccf267ed6d74fbc4..e296e9f5f04fa67bc41173940ba086931b30ac57 100644
--- a/pkg/compiler/lib/src/inferrer/node_tracer.dart
+++ b/pkg/compiler/lib/src/inferrer/node_tracer.dart
@@ -157,6 +157,14 @@ abstract class TracerVisitor implements TypeInformationVisitor {
     bailout("Passed through await");
   }
 
+  void visitYieldTypeInformation(YieldTypeInformation info) {
+    // TODO(29344): The enclosing sync*/async/async* method could have a
+    // tracable TypeInformation for the Iterable / Future / Stream with an
+    // element TypeInformation. Then YieldTypeInformation could connect the
+    // source type information to the tracable element.
+    bailout("Passed through yield");
+  }
+
   void visitNarrowTypeInformation(NarrowTypeInformation info) {
     addNewEscapeInformation(info);
   }