X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Fprelude%2FTysPrim.lhs;h=3490a827ea56512dd2a4af2949c90c19ef61151e;hb=1caf694c7d5ea3699cfb988b25f0c850cedcd3e4;hp=4e1576f9f0f2d2cbbbdf2e6476f99a68d3560bcc;hpb=388e3356f71daffa62f1d4157e1e07e4c68f218a;p=ghc-hetmet.git

diff --git a/compiler/prelude/TysPrim.lhs b/compiler/prelude/TysPrim.lhs
index 4e1576f..3490a82 100644
--- a/compiler/prelude/TysPrim.lhs
+++ b/compiler/prelude/TysPrim.lhs
@@ -46,7 +46,7 @@ module TysPrim(
 	word64PrimTyCon,	word64PrimTy,
 
 	-- * Any
-	anyTyCon, anyType, anyTyConOfKind, anyTypeOfKind
+	anyTyCon, anyTyConOfKind, anyTypeOfKind
   ) where
 
 #include "HsVersions.h"
@@ -57,6 +57,7 @@ import OccName		( mkTcOcc )
 import OccName		( mkTyVarOccFS, mkTcOccFS )
 import TyCon		( TyCon, mkPrimTyCon, mkLiftedPrimTyCon, mkAnyTyCon )
 import Type
+import Coercion
 import SrcLoc
 import Unique		( mkAlphaTyVarUnique )
 import PrelNames
@@ -232,8 +233,13 @@ Note [Uniques of Any]
 Although Any(*->*), say, doesn't have a binding site, it still needs
 to have a Unique.  Unlike tuples (which are also an infinite family)
 there is no convenient way to index them, so we use the Unique from
-their OccName instead.  That should be unique!  (But in principle we
-must take care: it does not include the module/package.)
+their OccName instead.  That should be unique, 
+  - both wrt each other, because their strings differ
+
+  - and wrt any other Name, because Names get uniques with 
+    various 'char' tags, but the OccName of Any will 
+    get a Unique built with mkTcOccUnique, which has a particular 'char' 
+    tag; see Unique.mkTcOccUnique!
 
 Note [Strangely-kinded void TyCons]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -262,22 +268,14 @@ anyTyConName = mkPrimTc (fsLit "Any") anyTyConKey anyTyCon
 anyTyCon :: TyCon
 anyTyCon = mkLiftedPrimTyCon anyTyConName liftedTypeKind 0 PtrRep
 
-anyType :: Type
-anyType = mkTyConApp anyTyCon []
-
 anyTypeOfKind :: Kind -> Type
-anyTypeOfKind kind
-  | isLiftedTypeKind kind = anyType
-  | otherwise             = mkTyConApp (mk_any_tycon kind) []
+anyTypeOfKind kind = mkTyConApp (anyTyConOfKind kind) []
 
 anyTyConOfKind :: Kind -> TyCon
+-- Map all superkinds of liftedTypeKind to liftedTypeKind
 anyTyConOfKind kind 
-  | isLiftedTypeKind kind = anyTyCon
-  | otherwise             = mk_any_tycon kind
-
-mk_any_tycon :: Kind -> TyCon
-mk_any_tycon kind    -- Kind other than *
-  = tycon
+  | liftedTypeKind `isSubKind` kind = anyTyCon
+  | otherwise                       = tycon
   where
 	  -- Derive the name from the kind, thus:
 	  --     Any(*->*), Any(*->*->*)