Support symbol literals.

sdk/lib/_internal/compiler/implementation/scanner/listener.dart

Index: sdk/lib/_internal/compiler/implementation/scanner/listener.dart
diff --git a/sdk/lib/_internal/compiler/implementation/scanner/listener.dart b/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
index 314e8d735a912df3750114e4b6e9d5c4ddcf5107..1e8f36a4a958ff37f0a079ba6898acff20779727 100644
--- a/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
+++ b/sdk/lib/_internal/compiler/implementation/scanner/listener.dart
@@ -311,6 +311,12 @@ class Listener {
   void endSwitchBlock(int caseCount, Token beginToken, Token endToken) {
   }
 
+  void beginLiteralSymbol(Token token) {
+  }
+
+  void endLiteralSymbol(Token hashToken, int identifierCount) {
+  }
+
   void beginThrowExpression(Token token) {
   }
 
@@ -486,6 +492,9 @@ class Listener {
   void handleNoTypeVariables(Token token) {
   }
 
+  void handleOperator(Token token) {
+  }
+
   void handleOperatorName(Token operatorKeyword, Token token) {
   }
 
@@ -1351,6 +1360,11 @@ class NodeListener extends ElementListener {
     pushNode(new LiteralNull(token));
   }
 
+  void endLiteralSymbol(Token hashToken, int identifierCount) {
+    NodeList identifiers = makeNodeList(identifierCount, null, null, '.');
+    pushNode(new LiteralSymbol(hashToken, identifiers));
+  }
+
   void handleBinaryExpression(Token token) {
     Node argument = popNode();
     Node receiver = popNode();
@@ -1642,6 +1656,10 @@ class NodeListener extends ElementListener {
     handleNewExpression(token);
   }
 
+  void handleOperator(Token token) {
+    pushNode(new Operator(token));
+  }
+
   void handleOperatorName(Token operatorKeyword, Token token) {
     Operator op = new Operator(token);
     pushNode(new Send(new Identifier(operatorKeyword), op, null));