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-rw-r--r--compiler/utils/Util.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/utils/Util.hs b/compiler/utils/Util.hs
index aa4afa5451..dba5a4495f 100644
--- a/compiler/utils/Util.hs
+++ b/compiler/utils/Util.hs
@@ -576,7 +576,7 @@ only _ = panic "Util: only"
isIn, isn'tIn :: Eq a => String -> a -> [a] -> Bool
-# ifndef DEBUG
+# if !defined(DEBUG)
isIn _msg x ys = x `elem` ys
isn'tIn _msg x ys = x `notElem` ys