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-rw-r--r--src/llex.js1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/llex.js b/src/llex.js
index da15b2f..703db49 100644
--- a/src/llex.js
+++ b/src/llex.js
@@ -500,6 +500,7 @@ const llex = function(ls, seminfo) {
ls.buff.buffer = [];
for (;;) {
+ assert(typeof ls.current == "number");
switch (ls.current) {
case char['\n']: case char['\r']: { /* line breaks */
inclinenumber(ls);