diff -ur a/Hidden/RegexPRCore.hs b/Hidden/RegexPRCore.hs
--- a/Hidden/RegexPRCore.hs	2011-07-06 08:45:23.000000000 +0200
+++ b/Hidden/RegexPRCore.hs	2025-03-10 19:05:09.882872109 +0100
@@ -31,10 +31,10 @@
                               beginningOfInput, endOfInput,
                               MonadPlus(..), (>++>) )
 import Hidden.ParseRegexStr ( RegexAction(..), parseRegexStr )
-import Control.Monad.State  ( StateT, runStateT, gets, modify, lift, liftM )
+import Control.Monad.State  ( StateT, runStateT, gets, modify, lift )
 import Control.Monad.Reader ( ask )
 import Hidden.Tools         ( guardEqual )
-import Control.Monad        ( unless )
+import Control.Monad        ( unless, liftM )
 
 matchRegexPRVerbose ::
   String -> (String, String)
Only in b: dist-newstyle