Source positions for constructors and lots of async machinery

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 27 matching lines @@
   // TokenDesc defines the kind of a token and its location in
   // the source text.
   struct TokenDescriptor {
     Token::Kind kind;
     int offset;               // Offset in source string.
     SourcePosition position;  // Text position in source.
     const String* literal;    // Identifier, number or string literal.
   };
 
   // Dummy token index reflecting an unknown source position.
-  static const intptr_t kNoSourcePos = -1;
+  static const intptr_t kNoSourcePos = Token::kNoSourcePos;
 
   static bool ValidSourcePosition(intptr_t token_pos) {
     return (token_pos >= 0) || (token_pos == kNoSourcePos);
   }
 
   typedef ZoneGrowableArray<TokenDescriptor> GrowableTokenStream;
 
   // Initializes scanner to scan string source.
   Scanner(const String& source, const String& private_key);
   ~Scanner();
@@ skipping 159 matching lines @@
   Zone* zone_;
 
   static KeywordTable keywords_[Token::kNumKeywords];
   static int keywords_char_offset_[kNumLowercaseChars];
 };
 
 
 }  // namespace dart
 
 #endif  // VM_SCANNER_H_