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

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index e45e2f070c7023237cb1772531486774df3e6b34..4f472d0b8b7bf13ee6a175643a4af5f84fb2b99e 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -873,8 +873,6 @@ class PreParser : public ParserBase<PreParser> {
     } else if (is_strict(this->scope()->language_mode())) {
       CheckStrictOctalLiteral(start_position, scanner()->location().end_pos,
                               &ok);
-      CheckDecimalLiteralWithLeadingZero(start_position,
-                                         scanner()->location().end_pos);
     }
     if (materialized_literals) {
       *materialized_literals = function_state_->materialized_literal_count();