diff options
Diffstat (limited to 'compiler/utils/FastString.hs')
| -rw-r--r-- | compiler/utils/FastString.hs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/compiler/utils/FastString.hs b/compiler/utils/FastString.hs index ea95d84763..27bb510299 100644 --- a/compiler/utils/FastString.hs +++ b/compiler/utils/FastString.hs @@ -192,6 +192,10 @@ instance Ord FastString where | otherwise = y compare a b = cmpFS a b +instance Monoid FastString where + mempty = nilFS + mappend = appendFS + instance Show FastString where show fs = show (unpackFS fs) |