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-rw-r--r--compiler/utils/FastString.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/utils/FastString.hs b/compiler/utils/FastString.hs
index 40c3882b87..407c185ee8 100644
--- a/compiler/utils/FastString.hs
+++ b/compiler/utils/FastString.hs
@@ -513,7 +513,7 @@ appendFS fs1 fs2 = mkFastStringByteString
(fastStringToByteString fs2)
concatFS :: [FastString] -> FastString
-concatFS ls = mkFastString (Prelude.concat (map unpackFS ls)) -- ToDo: do better
+concatFS = mkFastStringByteString . BS.concat . map fs_bs
headFS :: FastString -> Char
headFS (FastString _ 0 _ _) = panic "headFS: Empty FastString"