Support is tests

pkg/compiler/lib/src/js_backend/runtime_types.dart

Index: pkg/compiler/lib/src/js_backend/runtime_types.dart
diff --git a/pkg/compiler/lib/src/js_backend/runtime_types.dart b/pkg/compiler/lib/src/js_backend/runtime_types.dart
index f6850c42313378faabec8095bbf2474981cb1696..0111db8666a1ade974afff6cdbcc302b285cafdb 100644
--- a/pkg/compiler/lib/src/js_backend/runtime_types.dart
+++ b/pkg/compiler/lib/src/js_backend/runtime_types.dart
@@ -948,7 +948,7 @@ class RuntimeTypesEncoderImpl implements RuntimeTypesEncoder {
 }
 
 class TypeRepresentationGenerator
-    implements ResolutionDartTypeVisitor<dynamic, Emitter> {
+    implements ResolutionDartTypeVisitor<jsAst.Expression, Emitter> {
   final Namer namer;
   OnVariableCallback onVariable;
   ShouldEncodeTypedefCallback shouldEncodeTypedef;
@@ -983,9 +983,11 @@ class TypeRepresentationGenerator
   jsAst.Expression getDynamicValue() => js('null');
 
   @override
-  visit(DartType type, Emitter emitter) => type.accept(this, emitter);
+  jsAst.Expression visit(DartType type, Emitter emitter) =>
+      type.accept(this, emitter);
 
-  visitTypeVariableType(TypeVariableType type, Emitter emitter) {
+  jsAst.Expression visitTypeVariableType(
+      TypeVariableType type, Emitter emitter) {
     if (type.element.typeDeclaration is! ClassEntity) {
       /// A [TypeVariableType] from a generic method is replaced by a
       /// [DynamicType].
@@ -999,11 +1001,11 @@ class TypeRepresentationGenerator
     return onVariable(type);
   }
 
-  visitDynamicType(DynamicType type, Emitter emitter) {
+  jsAst.Expression visitDynamicType(DynamicType type, Emitter emitter) {
     return getDynamicValue();
   }
 
-  visitInterfaceType(InterfaceType type, Emitter emitter) {
+  jsAst.Expression visitInterfaceType(InterfaceType type, Emitter emitter) {
     jsAst.Expression name = getJavaScriptClassName(type.element, emitter);
     return type.treatAsRaw
         ? name
@@ -1042,7 +1044,7 @@ class TypeRepresentationGenerator
         .expressionTemplateFor('{ ${namer.functionTypeTag}: "dynafunc" }');
   }
 
-  visitFunctionType(FunctionType type, Emitter emitter) {
+  jsAst.Expression visitFunctionType(FunctionType type, Emitter emitter) {
     List<jsAst.Property> properties = <jsAst.Property>[];
 
     void addProperty(String name, jsAst.Expression value) {
@@ -1082,17 +1084,18 @@ class TypeRepresentationGenerator
     return new jsAst.ObjectInitializer(properties);
   }
 
-  visitMalformedType(MalformedType type, Emitter emitter) {
+  jsAst.Expression visitMalformedType(MalformedType type, Emitter emitter) {
     // Treat malformed types as dynamic at runtime.
     return js('null');
   }
 
-  visitVoidType(VoidType type, Emitter emitter) {
+  jsAst.Expression visitVoidType(VoidType type, Emitter emitter) {
     // TODO(ahe): Reify void type ("null" means "dynamic").
     return js('null');
   }
 
-  visitTypedefType(ResolutionTypedefType type, Emitter emitter) {
+  jsAst.Expression visitTypedefType(
+      ResolutionTypedefType type, Emitter emitter) {
     bool shouldEncode = shouldEncodeTypedef(type);
     DartType unaliasedType = type.unaliased;