Add missing case in removePrefix

1 files changed, 1 insertions, 0 deletions

diff --git a/Setup.hs b/Setup.hs
index cf84de0..c35fcf9 100644
--- a/Setup.hs
+++ b/Setup.hs
@@ -38,6 +38,7 @@ extractPrefixArgs prefix args
 
 removePrefix :: String -> String -> Maybe String
 removePrefix "" ys = Just ys
+removePrefix _  "" = Nothing
 removePrefix (x:xs) (y:ys)
  | x == y = removePrefix xs ys
  | otherwise = Nothing