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-rw-r--r--compiler/utils/FastString.hs3
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/utils/FastString.hs b/compiler/utils/FastString.hs
index 41889cfdc4..490eb138bf 100644
--- a/compiler/utils/FastString.hs
+++ b/compiler/utils/FastString.hs
@@ -192,6 +192,9 @@ instance Ord FastString where
| otherwise = y
compare a b = cmpFS a b
+instance IsString FastString where
+ fromString = fsLit
+
instance Monoid FastString where
mempty = nilFS
mappend = appendFS