From 96d6b8ebd32166f5d72420e94060de4792da999b Mon Sep 17 00:00:00 2001
From: Jed Barber <jjbarber@y7mail.com>
Date: Tue, 11 Feb 2014 22:32:45 +1100
Subject: Fixed bug where no possible rules to apply

---
 Thue/Interpreter.hs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Thue/Interpreter.hs b/Thue/Interpreter.hs
index 896ec8a..c53bff9 100644
--- a/Thue/Interpreter.hs
+++ b/Thue/Interpreter.hs
@@ -26,7 +26,8 @@ thue program =
 interpret :: ThueState -> [ThueRule] -> StdGen -> IO ThueState
 interpret state rules gen = do
     let possibleRules = rules `applicableTo` state
-        ruleToApply = possibleRules !! num
+        ruleToApply = if (possibleRules == []) then (ThueRule "" "") else possibleRules !! num
+        -- ^ dummy rule if no possible rules apply
 
         (num, gen') = nextInRange 0 (length possibleRules - 1) gen
 
-- 
cgit