A decimal integer literal with a leading 0 is now an error in strict mode.

src/parsing/scanner.cc

Index: src/parsing/scanner.cc
diff --git a/src/parsing/scanner.cc b/src/parsing/scanner.cc
index cfc0410b83cc77cbb78984aba151113d94429633..fd8669a0f9e35ac2606de403c245a97acaa03325 100644
--- a/src/parsing/scanner.cc
+++ b/src/parsing/scanner.cc
@@ -78,10 +78,8 @@ bool Scanner::BookmarkScope::HasBeenApplied() {
 Scanner::Scanner(UnicodeCache* unicode_cache)
     : unicode_cache_(unicode_cache),
       octal_pos_(Location::invalid()),
-      decimal_with_leading_zero_pos_(Location::invalid()),
-      found_html_comment_(false) {
-}
-
+      octal_message_(MessageTemplate::kNone),
+      found_html_comment_(false) {}
 
 void Scanner::Initialize(Utf16CharacterStream* source) {
   source_ = source;
@@ -917,6 +915,7 @@ uc32 Scanner::ScanOctalEscape(uc32 c, int length) {
   // occur before the "use strict" directive.
   if (c != '0' || i > 0) {
     octal_pos_ = Location(source_pos() - i - 1, source_pos() - 1);
+    octal_message_ = MessageTemplate::kStrictOctalEscape;
   }
   return x;
 }
@@ -1130,6 +1129,7 @@ Token::Value Scanner::ScanNumber(bool seen_period) {
           if (c0_  < '0' || '7'  < c0_) {
             // Octal literal finished.
             octal_pos_ = Location(start_pos, source_pos());
+            octal_message_ = MessageTemplate::kStrictOctalLiteral;
             break;
           }
           AddLiteralCharAdvance();
@@ -1157,8 +1157,10 @@ Token::Value Scanner::ScanNumber(bool seen_period) {
           literal.Complete();
           HandleLeadSurrogate();
 
-          if (kind == DECIMAL_WITH_LEADING_ZERO)
-            decimal_with_leading_zero_pos_ = Location(start_pos, source_pos());
+          if (kind == DECIMAL_WITH_LEADING_ZERO) {
+            octal_pos_ = Location(start_pos, source_pos());
+            octal_message_ = MessageTemplate::kStrictOctalLiteral;
+          }
           return Token::SMI;
         }
         HandleLeadSurrogate();
@@ -1198,8 +1200,10 @@ Token::Value Scanner::ScanNumber(bool seen_period) {
 
   literal.Complete();
 
-  if (kind == DECIMAL_WITH_LEADING_ZERO)
-    decimal_with_leading_zero_pos_ = Location(start_pos, source_pos());
+  if (kind == DECIMAL_WITH_LEADING_ZERO) {
+    octal_pos_ = Location(start_pos, source_pos());
+    octal_message_ = MessageTemplate::kStrictOctalLiteral;
+  }
   return Token::NUMBER;
 }