From a2066ced1fb3bf782514a439ad0981fcb1f0df51 Mon Sep 17 00:00:00 2001
From: Melody Horn <melody@boringcactus.com>
Date: Thu, 1 Apr 2021 12:36:14 -0600
Subject: don't put duplicates on the queue

---
 bird-machine-macros/src/dfa.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bird-machine-macros/src/dfa.rs b/bird-machine-macros/src/dfa.rs
index 0aec059..6f5e6f7 100644
--- a/bird-machine-macros/src/dfa.rs
+++ b/bird-machine-macros/src/dfa.rs
@@ -49,7 +49,7 @@ impl From<NFA> for LabeledDFA<BTreeSet<usize>> {
             }
 
             for states in next_table.values() {
-                if !transition_table.contains_key(states) {
+                if !transition_table.contains_key(states) && !queue.contains(states) {
                     queue.push_back(states.clone());
                 }
             }
-- 
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