Fix the build with GHC 6.2.2

[ghc-hetmet.git] / compiler / types / TyCon.lhs

diff --git a/compiler/types/TyCon.lhs b/compiler/types/TyCon.lhs
index d91effe..eb0474b 100644 (file)
--- a/compiler/types/TyCon.lhs
+++ b/compiler/types/TyCon.lhs
@@ -1,7 +1,9 @@
 %
+% (c) The University of Glasgow 2006
 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
 %
-\section[TyCon]{The @TyCon@ datatype}
+
+The @TyCon@ datatype
 
 \begin{code}
 module TyCon(
@@ -66,13 +68,12 @@ module TyCon(
 import {-# SOURCE #-} TypeRep ( Kind, Type, PredType )
 import {-# SOURCE #-} DataCon ( DataCon, isVanillaDataCon )
 
-import Var             ( TyVar, Id )
-import Class           ( Class )
-import BasicTypes      ( Arity, RecFlag(..), Boxity(..), isBoxed )
-import Name            ( Name, nameUnique, NamedThing(getName) )
-import PrelNames       ( Unique, Uniquable(..) )
-import Maybe           ( isJust )
-import Maybes          ( orElse )
+import Var
+import Class
+import BasicTypes
+import Name
+import PrelNames
+import Maybes
 import Outputable
 import FastString
 \end{code}
@@ -171,7 +172,8 @@ data TyCon
        tyConUnique   :: Unique,
        tyConName     :: Name,
        tyConKind     :: Kind,
-       tyConArity    :: Arity,
+       tyConArity    :: Arity,         -- SLPJ Oct06: I'm not sure what the significance
+                                       --             of the arity of a primtycon is!
 
        primTyConRep  :: PrimRep,
                        -- Many primitive tycons are unboxed, but some are
@@ -543,8 +545,8 @@ isAlgTyCon (TupleTyCon {}) = True
 isAlgTyCon other          = False
 
 isDataTyCon :: TyCon -> Bool
--- isDataTyCon returns True for data types that are represented by
--- heap-allocated constructors.
+-- isDataTyCon returns True for data types that are definitely
+-- represented by heap-allocated constructors.
 -- These are srcutinised by Core-level @case@ expressions, and they
 -- get info tables allocated for them.
 --     True for all @data@ types
@@ -556,7 +558,7 @@ isDataTyCon tc@(AlgTyCon {algTcRhs = rhs})
        DataTyCon {}  -> True
        OpenNewTyCon  -> False
        NewTyCon {}   -> False
-       AbstractTyCon -> pprPanic "isDataTyCon" (ppr tc)
+       AbstractTyCon -> False  -- We don't know, so return False
 isDataTyCon (TupleTyCon {tyConBoxed = boxity}) = isBoxed boxity
 isDataTyCon other = False