-isOneShotLambda :: Id -> Bool
-isOneShotLambda id = analysis || hack
- where analysis = case idLBVarInfo id of
- LBVarInfo u | u `eqUsage` usOnce -> True
- other -> False
- hack = case splitTyConApp_maybe (idType id) of
- Just (tycon,_) | tycon == statePrimTyCon -> True
- other -> False
-
- -- The last clause is a gross hack. It claims that
+isOneShotBndr :: Id -> Bool
+-- This one is the "business end", called externally.
+-- Its main purpose is to encapsulate the Horrible State Hack
+isOneShotBndr id = isOneShotLambda id || (isStateHackType (idType id))
+
+isStateHackType :: Type -> Bool
+isStateHackType ty
+ | opt_NoStateHack
+ = False
+ | otherwise
+ = case splitTyConApp_maybe ty of
+ Just (tycon,_) -> tycon == statePrimTyCon
+ other -> False
+ -- This is a gross hack. It claims that