Allow surrogates in string literals.

pkg/analyzer/test/generated/parser_test.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.
 
 library analyzer.test.generated.parser_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/error/error.dart';
@@ skipping 1353 matching lines @@
     parse4("parseForStatement", "for (int a = 0 in foo) {}",
         [ParserErrorCode.INITIALIZED_VARIABLE_IN_FOR_EACH]);
   }
 
   void test_invalidAwaitInFor() {
     parse4("parseForStatement", "await for (; ;) {}",
         [ParserErrorCode.INVALID_AWAIT_IN_FOR]);
   }
 
   void test_invalidCodePoint() {
-    parse4("parseStringLiteral", "'\\uD900'",
+    parse4("parseStringLiteral", "'\\u{110000}'",
         [ParserErrorCode.INVALID_CODE_POINT]);
   }
 
   void test_invalidHexEscape_invalidDigit() {
     parse4(
         "parseStringLiteral", "'\\x0 a'", [ParserErrorCode.INVALID_HEX_ESCAPE]);
   }
 
   void test_invalidHexEscape_tooFewDigits() {
     parse4(
@@ skipping 9621 matching lines @@
         new Scanner(null, new CharSequenceReader(source), listener);
     Token tokenStream = scanner.tokenize();
     //
     // Parse the source.
     //
     Parser parser = new Parser(null, listener);
     return invokeParserMethodImpl(
         parser, methodName, <Object>[tokenStream], tokenStream) as Token;
   }
 }