Allow closures in string literals in initializer expressions.

sdk/lib/_internal/compiler/implementation/scanner/parser.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.
 
 part of scanner;
 
 class FormalParameterType {
   final String type;
   const FormalParameterType(this.type);
   bool get isRequired => this == REQUIRED;
@@ skipping 1923 matching lines @@
     listener.handleLiteralInt(token);
     return token.next;
   }
 
   Token parseLiteralDouble(Token token) {
     listener.handleLiteralDouble(token);
     return token.next;
   }
 
   Token parseLiteralString(Token token) {
+    bool old = mayParseFunctionExpressions;
+    mayParseFunctionExpressions = true;
     token = parseSingleLiteralString(token);
     int count = 1;
     while (identical(token.kind, STRING_TOKEN)) {
       token = parseSingleLiteralString(token);
       count++;
     }
     if (count > 1) {
       listener.handleStringJuxtaposition(count);
     }
+    mayParseFunctionExpressions = old;
     return token;
   }
 
   Token parseLiteralSymbol(Token token) {
     Token hashToken = token;
     listener.beginLiteralSymbol(hashToken);
     token = token.next;
     if (isUserDefinableOperator(token.stringValue)) {
       listener.handleOperator(token);
       listener.endLiteralSymbol(hashToken, 1);
@@ skipping 475 matching lines @@
     }
     listener.handleContinueStatement(hasTarget, continueKeyword, token);
     return expectSemicolon(token);
   }
 
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);
   }
 }