From c984876e3ad5300893d0d96498a1286cc267309c Mon Sep 17 00:00:00 2001
From: Max Brunsfeld <maxbrunsfeld@gmail.com>
Date: Sat, 6 Aug 2016 21:22:44 -0700
Subject: [PATCH] Remove stack versions that are worse than the finished tree

---
 src/runtime/parser.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/runtime/parser.c b/src/runtime/parser.c
index d11082c2..930abf61 100644
--- a/src/runtime/parser.c
+++ b/src/runtime/parser.c
@@ -367,6 +367,9 @@ static bool ts_parser__better_version_exists(TSParser *self,
                                              StackVersion version,
                                              unsigned my_error_depth,
                                              unsigned my_error_cost) {
+  if (self->finished_tree && self->finished_tree->error_size <= my_error_cost)
+    return true;
+
   for (StackVersion i = 0, n = ts_stack_version_count(self->stack); i < n; i++) {
     if (i == version || ts_stack_is_halted(self->stack, i))
       continue;