Support symbol literals.

tests/compiler/dart2js/unparser_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
 import 'parser_helper.dart';
 import 'mock_compiler.dart';
 import '../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart';
 
 testUnparse(String statement) {
@@ skipping 323 matching lines @@
   testUnparseParameters(
       ["foo()", "void bar()", "int baz(a)", "int boz(int a,int b)=null"]);
   testUnparseParameters(
       ["this.foo()",
        //"void this.bar()", // Commented out due to Issue 7852
        //"int this.baz(a)", // Commented out due to Issue 7852
        //"int this.boz(int a,int b)=null" // Commented out due to Issue 7852
        ]);
 }
 
+testSymbolLiterals() {
+  testUnparse("#+;");  
+  testUnparse("#-;");
+  testUnparse("#*;");
+  testUnparse("#/;");
+  testUnparse("#~/;");
+  testUnparse("#%;");
+  testUnparse("#<;");
+  testUnparse("#<=;");
+  testUnparse("#>;");
+  testUnparse("#>=;");
+  testUnparse("#==;");
+  testUnparse("#&;");
+  testUnparse("#|;");
+  testUnparse("#^;");
+  
+  testUnparse("#a;");
+  testUnparse("#a.b;");
+  testUnparse("#a.b.c;");
+  testUnparse("#aa.bb.cc.dd;");
+}
+
 main() {
   testSignedConstants();
   testGenericTypes();
   testForLoop();
   testEmptyList();
   testClosure();
   testIndexedOperatorDecl();
   testNativeMethods();
   testPrefixIncrements();
   testConstModifier();
   testSimpleObjectInstantiation();
   testLibraryName();
   testImport();
   testExport();
   testPart();
   testPartOf();
   testCombinators();
   testRedirectingFactoryConstructors();
   testClassDeclarations();
   testMixinApplications();
   testParameters();
+  testSymbolLiterals();
 }