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| -rw-r--r-- | src/Text/Pandoc/Class.hs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/Text/Pandoc/Class.hs b/src/Text/Pandoc/Class.hs index aa0379942..f7544433c 100644 --- a/src/Text/Pandoc/Class.hs +++ b/src/Text/Pandoc/Class.hs @@ -923,7 +923,11 @@ data FileInfo = FileInfo { infoFileMTime :: UTCTime } newtype FileTree = FileTree {unFileTree :: M.Map FilePath FileInfo} +#if MIN_VERSION_base(4,9,0) + deriving (Semigroup, Monoid) +#else deriving (Monoid) +#endif getFileInfo :: FilePath -> FileTree -> Maybe FileInfo getFileInfo fp tree = |