Test all methods in semantic_visitor_test.

pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart

Index: pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart
diff --git a/pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart b/pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart
index c3221ef720f8e7eac85073da8321ca40c1a2679c..a3587f8552f9e4d4925a7795663c9f70e793e99d 100644
--- a/pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart
+++ b/pkg/compiler/lib/src/resolution/semantic_visitor_mixins.dart
@@ -4078,6 +4078,7 @@ class TraversalSendMixin<R, A> implements SemanticSendVisitor<R, A> {
       Selector selector,
       Node rhs,
       A arg) {
+    apply(receiver, arg);
     apply(rhs, arg);
     return null;
   }