Drop unnecessary toString() in interpolations.

pkg/analyzer/lib/src/generated/scanner.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.scanner;
 
 import 'dart:collection';
@@ skipping 1907 matching lines @@
    */
   const ScannerErrorCode.con2(String name, int ordinal, this.message, this.correction) : super(name, ordinal);
 
   @override
   ErrorSeverity get errorSeverity => ErrorSeverity.ERROR;
 
   @override
   ErrorType get type => ErrorType.SYNTACTIC_ERROR;
 
   @override
-  String get uniqueName => "${runtimeType.toString()}.${name}";
+  String get uniqueName => "$runtimeType.$name";
 }
 
 /**
  * Instances of the class `StringToken` represent a token whose value is independent of it's
  * type.
  */
 class StringToken extends Token {
   /**
    * The lexeme represented by this token.
    */
@@ skipping 758 matching lines @@
    * @param precedingComment the first comment in the list of comments that precede this token
    */
   TokenWithComment(TokenType type, int offset, this._precedingComment) : super(type, offset);
 
   @override
   Token copy() => new TokenWithComment(type, offset, _precedingComment);
 
   @override
   Token get precedingComments => _precedingComment;
 }