Fix case where loop was created in the parse stack

Fixes #133
2018-03-01 22:41:53 -08:00 · 2018-03-01 22:41:53 -08:00 · 82c7e170b3
commit 82c7e170b3
parent 32ef3e001a
2 changed files with 40 additions and 5 deletions
--- a/src/runtime/stack.c
+++ b/src/runtime/stack.c
@ -167,6 +167,8 @@ static bool stack__tree_is_equivalent(const Tree *left, const Tree *right) {
 }

 static void stack_node_add_link(StackNode *self, StackLink link) {
+  if (link.node == self) return;
+
  for (int i = 0; i < self->link_count; i++) {
    StackLink existing_link = self->links[i];
    if (stack__tree_is_equivalent(existing_link.tree, link.tree)) {