Reject high- and low-surrogates in escaped code points.

runtime/vm/scanner.h

 // Copyright (c) 2011, 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.
 //
 // Scanner class for the Dart language. The scanner reads source text
 // and produces a stream of tokens which is used by the parser.
 //
 
 #ifndef VM_SCANNER_H_
 #define VM_SCANNER_H_
@@ skipping 154 matching lines @@
   // Read the characters of a string literal.
   void ScanLiteralStringChars(bool is_raw);
 
   // Reads a fixed number of hexadecimal digits.
   bool ScanHexDigits(int digits, uint32_t* value);
 
   // Reads a variable number of hexadecimal digits.
   bool ScanHexDigits(int min_digits, int max_digits, uint32_t* value);
 
   // Reads an escaped code point from within a string literal.
-  bool ScanEscapedCodePoint(uint32_t* escaped_char);
+  void ScanEscapedCodePoint(uint32_t* escaped_char);
 
   // Reads identifier.
   RawString* ConsumeIdentChars(bool allow_dollar);
   void ScanIdentChars(bool allow_dollar);
   void ScanIdent() {
     ScanIdentChars(true);
   }
   void ScanIdentNoDollar() {
     ScanIdentChars(false);
   }
@@ skipping 25 matching lines @@
 
   SourcePosition c0_pos_;      // Source position of lookahead character c0_.
   KeywordTable keywords_[Token::numKeywords];
   Array& keyword_symbol_table_;  // Access to keyword symbols in object store.
 };
 
 
 }  // namespace dart
 
 #endif  // VM_SCANNER_H_