@@ -4961,6 +4961,9 @@ node_t *run_mexpr(node_t *node) {
switch (node->tag) {
case N_LITERAL:
switch (node->t->tag) {
+ case T_NIL:
+ return NULL;
+
case T_NAME:
return table_get(list_index(MVARS, -1), node->t->text);
