Fix unparsing of variable definitions.

tests/compiler/dart2js/unparser_test.dart

Index: tests/compiler/dart2js/unparser_test.dart
diff --git a/tests/compiler/dart2js/unparser_test.dart b/tests/compiler/dart2js/unparser_test.dart
index 81afebae6902a4dfe21b653241592ff293dd1073..218656a8b59fc16b99969b4de696ea7aca8b3305 100644
--- a/tests/compiler/dart2js/unparser_test.dart
+++ b/tests/compiler/dart2js/unparser_test.dart
@@ -142,6 +142,12 @@ testClassWithMethod() {
   testDart2Dart('main(){var a=new A(); a.foo();}class A{void foo(){}}');
 }
 
+testVariableDefinitions() {
+  testDart2Dart('main(){final var x, y; final String s;}');
+  testDart2Dart('foo(f, g){}main(){foo(1, 2);}');
+  testDart2Dart('foo(f(arg)){}main(){foo(main);}');
+}
+
 main() {
   testGenericTypes();
   testForLoop();
@@ -156,5 +162,6 @@ main() {
   testSimpleTopLevelClass();
   testClassWithSynthesizedConstructor();
   testClassWithMethod();
+  testVariableDefinitions();
   testTopLevelField();
 }