From 17f1454a4f8a3f27050c97b03408d8e8bdf34321 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sun, 27 Jul 2025 14:50:18 -0400
Subject: [PATCH] Speedup: avoid checking the same rule set more than once for
 lookahead tokens

---
 lib/propane/parser.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/propane/parser.rb b/lib/propane/parser.rb
index 4cf7435..795c5b0 100644
--- a/lib/propane/parser.rb
+++ b/lib/propane/parser.rb
@@ -231,6 +231,7 @@ class Propane
                   rule_set = item.rule.rule_set
                   unless checked_rule_sets.include?(rule_set)
                     rule_sets_to_check_after << rule_set
+                    checked_rule_sets << rule_set
                   end
                   break
                 when Token