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diff --git a/ghc/compiler/envs/IdEnv.lhs b/ghc/compiler/envs/IdEnv.lhs
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+++ b/ghc/compiler/envs/IdEnv.lhs
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+%
+% (c) The AQUA Project, Glasgow University, 1995
+%
+\section[IdEnv]{Lookup tables that have @Id@ keys}
+
+An interface to the @FiniteMap@ machinery, which exports
+a ``personality'' the same as that of the old @IdEnv@ module.
+
+\begin{code}
+#include "HsVersions.h"
+
+module IdEnv (
+	IdEnv(..),  -- abstract: NOT
+
+	lookupIdEnv, lookupNoFailIdEnv,
+	nullIdEnv, unitIdEnv, mkIdEnv, growIdEnv, growIdEnvList,
+	isNullIdEnv,
+	addOneToIdEnv,
+	delOneFromIdEnv, delManyFromIdEnv, --UNUSED: minusIdEnv,
+	modifyIdEnv, combineIdEnvs,
+	rngIdEnv,
+	mapIdEnv,
+-- UNUSED:	filterIdEnv,
+
+	-- and to make the interface self-sufficient...
+	UniqFM,
+	Id, Unique, Maybe(..)
+	
+	-- and for pragma-friendliness...
+#ifdef USE_ATTACK_PRAGMAS
+	, addToUFM, plusUFM_C, delListFromUFM, delFromUFM, plusUFM,
+	lookupUFM, mapUFM, filterUFM, minusUFM, listToUFM, emptyUFM,
+	eltsUFM, singletonUFM,
+	u2i
+#endif
+    ) where
+
+import UniqFM
+import Id
+import IdInfo
+import Maybes		( Maybe(..), MaybeErr(..) )
+import Outputable
+import Unique		( Unique, u2i )
+import Util
+\end{code}
+
+\begin{code}
+type IdEnv elt = UniqFM elt
+\end{code}
+
+Signatures:
+\begin{code}
+addOneToIdEnv :: IdEnv a -> Id -> a -> IdEnv a
+combineIdEnvs :: (a -> a -> a) -> IdEnv a -> IdEnv a -> IdEnv a
+delManyFromIdEnv :: IdEnv a -> [Id] -> IdEnv a
+delOneFromIdEnv :: IdEnv a -> Id -> IdEnv a
+growIdEnv :: IdEnv a -> IdEnv a -> IdEnv a
+growIdEnvList :: IdEnv a -> [(Id, a)] -> IdEnv a
+isNullIdEnv :: IdEnv a -> Bool
+lookupIdEnv :: IdEnv a -> Id -> Maybe a
+lookupNoFailIdEnv :: IdEnv a -> Id -> a
+mapIdEnv :: (a -> b) -> IdEnv a -> IdEnv b
+--filterIdEnv :: (a -> Bool) -> IdEnv a -> IdEnv a
+--minusIdEnv :: IdEnv a -> IdEnv a -> IdEnv a
+mkIdEnv :: [(Id, a)] -> IdEnv a
+modifyIdEnv :: IdEnv a -> (a -> a) -> Id -> IdEnv a
+nullIdEnv :: IdEnv a
+rngIdEnv :: IdEnv a -> [a]
+unitIdEnv :: Id -> a -> IdEnv a
+\end{code}
+
+\begin{code}
+addOneToIdEnv env id elt = addToUFM env id elt
+
+combineIdEnvs combiner env1 env2 = plusUFM_C combiner env1 env2
+
+delManyFromIdEnv env ids = delListFromUFM env ids
+
+delOneFromIdEnv env id = delFromUFM env id
+
+growIdEnv old_env new_stuff = plusUFM old_env new_stuff
+
+growIdEnvList old_env pairs = plusUFM old_env (listToUFM pairs)
+
+isNullIdEnv env = sizeUFM env == 0
+
+lookupIdEnv env id = lookupUFM env id
+
+lookupNoFailIdEnv env id = case (lookupIdEnv env id) of { Just xx -> xx }
+
+mapIdEnv f env = mapUFM f env
+
+{- UNUSED:
+filterIdEnv p env = filterUFM p env
+minusIdEnv env1 env2 = minusUFM env1 env2
+-}
+
+mkIdEnv stuff = listToUFM stuff
+
+-- modifyIdEnv: Look up a thing in the IdEnv, then mash it with the
+-- modify function, and put it back.
+
+modifyIdEnv env mangle_fn key
+  = case (lookupIdEnv env key) of
+      Nothing -> env
+      Just xx -> addOneToIdEnv env key (mangle_fn xx)
+
+nullIdEnv = emptyUFM
+
+rngIdEnv env = eltsUFM env
+
+unitIdEnv id elt = singletonUFM id elt
+\end{code}