X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2FbasicTypes%2FVar.lhs;h=017e355e4518cf05d30034b864d7cf7a76012149;hb=a97f155c04a7ff981da3e589158ecf70db72d1cd;hp=e4aa8c23d65ae5c46a08433c3c9340ee246108c9;hpb=6fcf90065dc4e75b7dc6bbf238a9891a71ae5a86;p=ghc-hetmet.git

diff --git a/compiler/basicTypes/Var.lhs b/compiler/basicTypes/Var.lhs
index e4aa8c2..017e355 100644
--- a/compiler/basicTypes/Var.lhs
+++ b/compiler/basicTypes/Var.lhs
@@ -10,7 +10,7 @@ module Var (
 	setVarName, setVarUnique, 
 
 	-- TyVars
-	TyVar, mkTyVar, mkTcTyVar, mkWildTyVar,
+	TyVar, mkTyVar, mkTcTyVar, mkWildCoVar,
 	tyVarName, tyVarKind,
 	setTyVarName, setTyVarUnique, setTyVarKind,
 	tcTyVarDetails,
@@ -22,7 +22,7 @@ module Var (
 	Id, DictId,
 	idName, idType, idUnique, idInfo, modifyIdInfo, maybeModifyIdInfo,
 	setIdName, setIdUnique, setIdType, setIdInfo, lazySetIdInfo, 
-	setIdExported, setIdNotExported, 
+	setIdExported, setIdNotExported,
 
 	globalIdDetails, globaliseId, 
 
@@ -40,12 +40,14 @@ import {-# SOURCE #-}	TcType( TcTyVarDetails, pprTcTyVarDetails )
 import {-# SOURCE #-}	IdInfo( GlobalIdDetails, notGlobalId, IdInfo, seqIdInfo )
 
 import Name		( Name, NamedThing(..),
-			  setNameUnique, nameUnique, mkSysTvName
+			  setNameUnique, nameUnique, mkSysTvName, 
+                          mkSystemVarName
 			)
 import Unique		( Unique, Uniquable(..), mkUniqueGrimily, getKey#,
                           mkBuiltinUnique )
 import FastTypes
-import Outputable
+import FastString
+import Outputable       
 \end{code}
 
 
@@ -68,7 +70,9 @@ data Var
 	realUnique :: FastInt,		-- Key for fast comparison
 					-- Identical to the Unique in the name,
 					-- cached here for speed
-	tyVarKind :: Kind }
+	tyVarKind :: Kind,
+        isCoercionVar :: Bool
+ }
 
   | TcTyVar { 				-- Used only during type inference
 					-- Used for kind variables during 
@@ -189,6 +193,7 @@ mkTyVar :: Name -> Kind -> TyVar
 mkTyVar name kind = TyVar { varName    = name
 			  , realUnique = getKey# (nameUnique name)
 			  , tyVarKind  = kind
+                          , isCoercionVar    = False
 			}
 
 mkTcTyVar :: Name -> Kind -> TcTyVarDetails -> TyVar
@@ -199,13 +204,16 @@ mkTcTyVar name kind details
 		tcTyVarDetails = details
 	}
 
-mkWildTyVar :: Kind -> TyVar
-mkWildTyVar kind 
+mkWildCoVar :: Kind -> TyVar
+-- A type variable that is never referred to,
+-- so its unique doesn't matter
+mkWildCoVar kind 
   = TyVar { varName = mkSysTvName wild_uniq FSLIT("co_wild"),
             realUnique = _ILIT(1),
-            tyVarKind = kind }
+            tyVarKind = kind,
+            isCoercionVar = True }
   where
-    wild_uniq = (mkBuiltinUnique 1)
+    wild_uniq = mkBuiltinUnique 1
 \end{code}
 
 %************************************************************************
@@ -223,10 +231,12 @@ setCoVarUnique = setVarUnique
 setCoVarName   = setVarName
 
 mkCoVar :: Name -> Kind -> CoVar
-mkCoVar name kind = mkTyVar name kind
+mkCoVar name kind = TyVar { varName    = name
+			  , realUnique = getKey# (nameUnique name)
+			  , tyVarKind  = kind
+                          , isCoercionVar    = True
+			}
 
-isCoVar :: TyVar -> Bool
-isCoVar ty = isCoSuperKind (tyVarKind ty)
 \end{code}
 
 %************************************************************************
@@ -342,6 +352,9 @@ isId other	   = False
 isLocalId (LocalId {}) = True
 isLocalId other	       = False
 
+isCoVar (v@(TyVar {})) = isCoercionVar v
+isCoVar other          = False
+
 -- isLocalVar returns True for type variables as well as local Ids
 -- These are the variables that we need to pay attention to when finding free
 -- variables, or doing dependency analysis.