Implement AstBuilder.handleOperatorName.

pkg/front_end/lib/src/fasta/parser/listener.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.
 
 library fasta.parser.listener;
 
 import '../scanner/token.dart' show BeginGroupToken, Token;
 
 import '../util/link.dart' show Link;
 
@@ skipping 836 matching lines @@
   }
 
   void handleNoTypeVariables(Token token) {
     logEvent("NoTypeVariables");
   }
 
   void handleOperator(Token token) {
     logEvent("Operator");
   }
 
+  /// Handle the end of a construct of the form "operator <token>".
   void handleOperatorName(Token operatorKeyword, Token token) {
     logEvent("OperatorName");
   }
 
   void handleParenthesizedExpression(BeginGroupToken token) {
     logEvent("ParenthesizedExpression");
   }
 
   /// Handle a construct of the form "identifier.identifier" occurring in a part
   /// of the grammar where expressions in general are not allowed.
@@ skipping 91 matching lines @@
 
   final Map arguments;
 
   ParserError(this.beginOffset, this.endOffset, this.kind, this.arguments);
 
   ParserError.fromTokens(Token begin, Token end, ErrorKind kind, Map arguments)
       : this(begin.charOffset, end.charOffset + end.charCount, kind, arguments);
 
   String toString() => "@${beginOffset}: $kind $arguments";
 }