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diff --git a/compiler/utils/FastStringEnv.lhs b/compiler/utils/FastStringEnv.lhs
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@@ -0,0 +1,75 @@
+%
+% (c) The University of Glasgow 2006
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
+%
+\section[FastStringEnv]{@FastStringEnv@: FastString environments}
+
+\begin{code}
+module FastStringEnv (
+        -- * FastString environments (maps)
+        FastStringEnv,
+
+        -- ** Manipulating these environments
+        mkFsEnv,
+        emptyFsEnv, unitFsEnv, fsEnvElts, fsEnvUniqueElts,
+        extendFsEnv_C, extendFsEnv_Acc, extendFsEnv,
+        extendFsEnvList, extendFsEnvList_C,
+        foldFsEnv, filterFsEnv,
+        plusFsEnv, plusFsEnv_C, alterFsEnv,
+        lookupFsEnv, lookupFsEnv_NF, delFromFsEnv, delListFromFsEnv,
+        elemFsEnv, mapFsEnv,
+    ) where
+
+import Unique
+import UniqFM
+import Maybes
+import FastString
+
+
+type FastStringEnv a = UniqFM a  -- Domain is FastString
+
+emptyFsEnv         :: FastStringEnv a
+mkFsEnv            :: [(FastString,a)] -> FastStringEnv a
+fsEnvElts          :: FastStringEnv a -> [a]
+fsEnvUniqueElts    :: FastStringEnv a -> [(Unique, a)]
+alterFsEnv         :: (Maybe a-> Maybe a) -> FastStringEnv a -> FastString -> FastStringEnv a
+extendFsEnv_C      :: (a->a->a) -> FastStringEnv a -> FastString -> a -> FastStringEnv a
+extendFsEnv_Acc    :: (a->b->b) -> (a->b) -> FastStringEnv b -> FastString -> a -> FastStringEnv b
+extendFsEnv        :: FastStringEnv a -> FastString -> a -> FastStringEnv a
+plusFsEnv          :: FastStringEnv a -> FastStringEnv a -> FastStringEnv a
+plusFsEnv_C        :: (a->a->a) -> FastStringEnv a -> FastStringEnv a -> FastStringEnv a
+extendFsEnvList    :: FastStringEnv a -> [(FastString,a)] -> FastStringEnv a
+extendFsEnvList_C  :: (a->a->a) -> FastStringEnv a -> [(FastString,a)] -> FastStringEnv a
+delFromFsEnv       :: FastStringEnv a -> FastString -> FastStringEnv a
+delListFromFsEnv   :: FastStringEnv a -> [FastString] -> FastStringEnv a
+elemFsEnv          :: FastString -> FastStringEnv a -> Bool
+unitFsEnv          :: FastString -> a -> FastStringEnv a
+lookupFsEnv        :: FastStringEnv a -> FastString -> Maybe a
+lookupFsEnv_NF     :: FastStringEnv a -> FastString -> a
+foldFsEnv          :: (a -> b -> b) -> b -> FastStringEnv a -> b
+filterFsEnv        :: (elt -> Bool) -> FastStringEnv elt -> FastStringEnv elt
+mapFsEnv           :: (elt1 -> elt2) -> FastStringEnv elt1 -> FastStringEnv elt2
+
+fsEnvElts x               = eltsUFM x
+emptyFsEnv                = emptyUFM
+unitFsEnv x y             = unitUFM x y
+extendFsEnv x y z         = addToUFM x y z
+extendFsEnvList x l       = addListToUFM x l
+lookupFsEnv x y           = lookupUFM x y
+alterFsEnv                = alterUFM
+mkFsEnv     l             = listToUFM l
+elemFsEnv x y             = elemUFM x y
+foldFsEnv a b c           = foldUFM a b c
+plusFsEnv x y             = plusUFM x y
+plusFsEnv_C f x y         = plusUFM_C f x y
+extendFsEnv_C f x y z     = addToUFM_C f x y z
+mapFsEnv f x              = mapUFM f x
+fsEnvUniqueElts x         = ufmToList x
+extendFsEnv_Acc x y z a b = addToUFM_Acc x y z a b
+extendFsEnvList_C x y z   = addListToUFM_C x y z
+delFromFsEnv x y          = delFromUFM x y
+delListFromFsEnv x y      = delListFromUFM x y
+filterFsEnv x y           = filterUFM x y
+
+lookupFsEnv_NF env n = expectJust "lookupFsEnv_NF" (lookupFsEnv env n)
+\end{code}