Fix newly introduced bug in detecing octal numbers.

src/scanner-base.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 546 matching lines @@
 
   LiteralScope literal(this);
   if (seen_period) {
     // we have already seen a decimal point of the float
     AddLiteralChar('.');
     ScanDecimalDigits();  // we know we have at least one digit
 
   } else {
     // if the first character is '0' we must check for octals and hex
     if (c0_ == '0') {
+      int start_pos = source_pos();  // For reporting octal positions.
       AddLiteralCharAdvance();
 
       // either 0, 0exxx, 0Exxx, 0.xxx, an octal number, or a hex number
       if (c0_ == 'x' || c0_ == 'X') {
         // hex number
         kind = HEX;
         AddLiteralCharAdvance();
         if (!IsHexDigit(c0_)) {
           // we must have at least one hex digit after 'x'/'X'
           return Token::ILLEGAL;
         }
         while (IsHexDigit(c0_)) {
           AddLiteralCharAdvance();
         }
       } else if ('0' <= c0_ && c0_ <= '7') {
         // (possible) octal number
         kind = OCTAL;
         while (true) {
           if (c0_ == '8' || c0_ == '9') {
             kind = DECIMAL;
             break;
           }
           if (c0_  < '0' || '7'  < c0_) {
             // Octal literal finished.
-            octal_pos_ = next_.location;
+            octal_pos_ = Location(start_pos, source_pos());
             break;
           }
           AddLiteralCharAdvance();
         }
       }
     }
 
     // Parse decimal digits and allow trailing fractional part.
     if (kind == DECIMAL) {
       ScanDecimalDigits();  // optional
@@ skipping 340 matching lines @@
       if (MatchKeywordStart(input, "with", 1, Token::WITH)) return;
       break;
     case UNMATCHABLE:
       break;
   }
   // On fallthrough, it's a failure.
   state_ = UNMATCHABLE;
 }
 
 } }  // namespace v8::internal