fix assertion failure

parser.c

@@ -238,13 +238,13 @@ static AstNodeIndex parseBuiltinCall(Parser* p) {
             break;
         case TOKEN_R_PAREN:
             p->tok_i++;
-            goto next;
+            goto end_loop;
         default:
             fprintf(stderr, "expected comma after arg\n");
             exit(1);
         }
-    next:;
     }
+end_loop:;
 
     const bool comma = (p->token_tags[p->tok_i - 2] == TOKEN_COMMA);
     const uint32_t params_len = p->scratch.len - scratch_top.old_len;