Move error-ids to MkCore (from PrelRules)

[ghc-hetmet.git] / compiler / iface / IfaceType.lhs

diff --git a/compiler/iface/IfaceType.lhs b/compiler/iface/IfaceType.lhs
index 2db1908..47772d7 100644 (file)
--- a/compiler/iface/IfaceType.lhs
+++ b/compiler/iface/IfaceType.lhs
@@ -73,7 +73,8 @@ data IfaceTyCon       -- Abbreviations for common tycons with known names
   | IfaceIntTc | IfaceBoolTc | IfaceCharTc
   | IfaceListTc | IfacePArrTc
   | IfaceTupTc Boxity Arity 
-  | IfaceAnyTc IfaceKind    -- Used for AnyTyCon (see Note [Any Types] in TysPrim)
+  | IfaceAnyTc IfaceKind     -- Used for AnyTyCon (see Note [Any Types] in TysPrim)
+                            -- other than 'Any :: *' itself
   | IfaceLiftedTypeKindTc | IfaceOpenTypeKindTc | IfaceUnliftedTypeKindTc
   | IfaceUbxTupleKindTc | IfaceArgTypeKindTc 
 
@@ -90,15 +91,16 @@ ifaceTyConName IfaceUnliftedTypeKindTc = unliftedTypeKindTyConName
 ifaceTyConName IfaceUbxTupleKindTc     = ubxTupleKindTyConName
 ifaceTyConName IfaceArgTypeKindTc      = argTypeKindTyConName
 ifaceTyConName (IfaceTc ext)           = ext
-ifaceTyConName (IfaceAnyTc kind)       = pprPanic "ifaceTyConName" (ppr (IfaceAnyTc kind))
+ifaceTyConName (IfaceAnyTc k)          = pprPanic "ifaceTyConName" (ppr k)
                                         -- Note [The Name of an IfaceAnyTc]
 \end{code}
 
 Note [The Name of an IfaceAnyTc]
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 It isn't easy to get the Name of an IfaceAnyTc in a pure way.  What you
 really need to do is to transform it to a TyCon, and get the Name of that.
-But doing so needs the monad.
+But doing so needs the monad because there's an IfaceKind inside, and we
+need a Kind.
 
 In fact, ifaceTyConName is only used for instances and rules, and we don't
 expect to instantiate those at these (internal-ish) Any types, so rather
@@ -253,14 +255,17 @@ instance Outputable IfacePredType where
                             <+> sep (map pprParendIfaceType ts)
 
 instance Outputable IfaceTyCon where
-  ppr (IfaceTc ext) = ppr ext
-  ppr other_tc      = ppr (ifaceTyConName other_tc)
+  ppr (IfaceAnyTc k) = ptext (sLit "Any") <> pprParendIfaceType k
+                            -- We can't easily get the Name of an IfaceAnyTc
+                            -- (see Note [The Name of an IfaceAnyTc])
+                            -- so we fake it.  It's only for debug printing!
+  ppr other_tc       = ppr (ifaceTyConName other_tc)
 
 -------------------
 pprIfaceContext :: IfaceContext -> SDoc
 -- Prints "(C a, D b) =>", including the arrow
 pprIfaceContext []     = empty
-pprIfaceContext theta = ppr_preds theta <+> ptext (sLit "=>")
+pprIfaceContext theta = ppr_preds theta <+> darrow
 
 ppr_preds :: [IfacePredType] -> SDoc
 ppr_preds [pred] = ppr pred    -- No parens