From 27c83d26737ee597e03cd3787319b76b804d52eb Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Mon, 7 May 2018 16:05:24 +0200
Subject: Better DFSTs

---
 edit-lens/src/Data/String/DFST.hs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'edit-lens/src')

diff --git a/edit-lens/src/Data/String/DFST.hs b/edit-lens/src/Data/String/DFST.hs
index 2eeb368..54a1336 100644
--- a/edit-lens/src/Data/String/DFST.hs
+++ b/edit-lens/src/Data/String/DFST.hs
@@ -19,7 +19,7 @@ import Control.Monad
 
 data DFST state = DFST
   { stInitial :: state
-  , stTransition :: Map (state, Char) (state, Maybe Char)
+  , stTransition :: Map (state, Char) (state, String)
     -- ^ All @(s, c)@-combinations not mapped are assumed to map to @(s, Nothing)@
   , stAccept :: Set state
   }
@@ -37,6 +37,6 @@ runDFST' :: forall state. Ord state
 runDFST' _ st [] acc = (st, acc)
 runDFST' dfst@DFST{..} st (c:cs) acc
   | Just (st', mc') <- stTransition !? (st, c)
-  = runDFST' dfst st' cs $ acc . maybe id (:) mc'
+  = runDFST' dfst st' cs $ acc . (mc' ++)
   | otherwise
   = runDFST' dfst st cs acc
-- 
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