From 39ce3c68d081c7219c5a6ccc8d0a394903f5c336 Mon Sep 17 00:00:00 2001
From: sof <unknown>
Date: Sun, 8 Nov 1998 17:08:34 +0000
Subject: [PATCH] [project @ 1998-11-08 17:08:34 by sof] primOpInfo
 WriteOffAddrOp fixed

---
 ghc/compiler/prelude/PrimOp.lhs |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/ghc/compiler/prelude/PrimOp.lhs b/ghc/compiler/prelude/PrimOp.lhs
index 71ad733..836e8c4 100644
--- a/ghc/compiler/prelude/PrimOp.lhs
+++ b/ghc/compiler/prelude/PrimOp.lhs
@@ -1213,13 +1213,17 @@ primOpInfo (IndexOffForeignObjOp kind)
 
 primOpInfo (WriteOffAddrOp kind)
   = let
-	s = alphaTy; s_tv = alphaTyVar
+	s = betaTy; s_tv = betaTyVar
 
 	(str, prim_ty, _) = getPrimRepInfo kind
 	op_str = _PK_ ("write" ++ str ++ "OffAddr#")
+
+        tvs
+	  | kind == StablePtrRep = [s_tv,alphaTyVar]
+	  | otherwise	         = [s_tv]
     in
     -- NB: *Prim*Result --
-    PrimResult op_str [s_tv]
+    PrimResult op_str tvs
 	[addrPrimTy, intPrimTy, prim_ty, mkStatePrimTy s]
 	statePrimTyCon VoidRep [s]
 
-- 
1.7.10.4