X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2FstgSyn%2FCoreToStg.lhs;h=2f59489e0aa5a0ce1795c2d64f8fd4bc0105c637;hb=0a095555ecc6400aba433bb7562140ac407730e1;hp=02258a963158b39b81d2cbb27f61bfa762d58b88;hpb=f714e6b642fd614a9971717045ae47c3d871275e;p=ghc-hetmet.git

diff --git a/ghc/compiler/stgSyn/CoreToStg.lhs b/ghc/compiler/stgSyn/CoreToStg.lhs
index 02258a9..2f59489 100644
--- a/ghc/compiler/stgSyn/CoreToStg.lhs
+++ b/ghc/compiler/stgSyn/CoreToStg.lhs
@@ -19,7 +19,7 @@ import Type
 import TyCon		( isAlgTyCon )
 import Id
 import Var		( Var, globalIdDetails, idType )
-import TyCon		( isUnboxedTupleTyCon, isPrimTyCon, isFunTyCon )
+import TyCon		( isUnboxedTupleTyCon, isPrimTyCon, isFunTyCon, isHiBootTyCon )
 #ifdef ILX
 import MkId		( unsafeCoerceId )
 #endif
@@ -411,7 +411,8 @@ mkStgAltType scrut_ty
   = case splitTyConApp_maybe (repType scrut_ty) of
 	Just (tc,_) | isUnboxedTupleTyCon tc -> UbxTupAlt tc
 		    | isPrimTyCon tc	     -> PrimAlt tc
-		    | isAlgTyCon tc	     -> AlgAlt tc
+		    | isHiBootTyCon tc	     -> PolyAlt	-- Algebraic, but no constructors visible
+		    | isAlgTyCon tc 	     -> AlgAlt tc
 		    | isFunTyCon tc	     -> PolyAlt
 		    | otherwise		     -> pprPanic "mkStgAlts" (ppr tc)
 	Nothing				     -> PolyAlt