Support symbol literals.

tests/language/symbol_literal_test.dart

+// Copyright (c) 2013, 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.
+
+// Test symbol literals.
+
+library symbol_literal_test;
+
+import 'package:expect/expect.dart';
+
+foo(a, b) => Expect.isTrue(identical(a, b));
+
+var check = foo; // Indirection used to avoid inlining.
+
+main() {
+  check(const Symbol("a"), #a);
+  check(const Symbol("a"), #
+                            a);
+  check(const Symbol("ab"), #ab);
+  check(const Symbol("ab"), #
+                             ab);
+  check(const Symbol("a.b"), #a.b);
+  check(const Symbol("a.b"), #
+                              a
+                               .
+                                b);
+  check(const Symbol("=="), #==);
+  check(const Symbol("=="), # ==);
+  check(const Symbol("a.toString"), #a.toString);
+
+  // Tries to call the symbol literal #a.toString
+  Expect.throws(() => #a.toString(), (e) => e is NoSuchMethodError); /// 01: static type warning
+}