Issue #1240 - Part 9 - Fix incorrectly parsing decimal BigInt 0n.

The decimal parser strips leading 0s, so prevent tokenbuf being empty.

1 files changed, 5 insertions, 2 deletions

diff --git a/js/src/frontend/TokenStream.cpp b/js/src/frontend/TokenStream.cpp
index b2fe0afcf4..b11c7df584 100644
--- a/js/src/frontend/TokenStream.cpp
+++ b/js/src/frontend/TokenStream.cpp
@@ -1646,9 +1646,12 @@ TokenStream::getTokenInternal(TokenKind* ttp, Modifier modifier)
         if (isBigInt) {
             size_t length = userbuf.addressOfNextRawChar() - numStart - 1;
             tokenbuf.clear();
-            if(!tokenbuf.reserve(length))
+            if(!tokenbuf.reserve(length > 0 ? length : 1))
                 goto error;
-            tokenbuf.infallibleAppend(numStart, length);
+            if(length > 0)
+                tokenbuf.infallibleAppend(numStart, length);
+            else
+                tokenbuf.infallibleAppend("0", 1);
             tp->type = TOK_BIGINT;
             goto out;
         }