X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Fprelude%2FTysWiredIn.lhs;h=36894793416b0b2cc316ca3379570f6528b1d93d;hp=80530b9398c5a3d18c61e839cd45c4123d104ba9;hb=fb6d198f498d4e325a540f28aaa6e1d1530839c3;hpb=7299e42cc5214458ba16034dbfbf58de55f7121b

diff --git a/compiler/prelude/TysWiredIn.lhs b/compiler/prelude/TysWiredIn.lhs
index 80530b9..3689479 100644
--- a/compiler/prelude/TysWiredIn.lhs
+++ b/compiler/prelude/TysWiredIn.lhs
@@ -3,12 +3,9 @@
 %
 \section[TysWiredIn]{Wired-in knowledge about {\em non-primitive} types}
 
-This module tracks the ``state interface'' document, ``GHC prelude:
-types and operations.''
-
 \begin{code}
 -- | This module is about types that can be defined in Haskell, but which
--- must be wired into the compiler nonetheless.
+--   must be wired into the compiler nonetheless.  C.f module TysPrim
 module TysWiredIn (
         -- * All wired in things
 	wiredInTyCons, 
@@ -41,7 +38,7 @@ module TysWiredIn (
 	mkListTy,
 
 	-- * Tuples
-	mkTupleTy,
+	mkTupleTy, mkBoxedTupleTy,
 	tupleTyCon, tupleCon, 
 	unitTyCon, unitDataCon, unitDataConId, pairTyCon, 
 	unboxedSingletonTyCon, unboxedSingletonDataCon,
@@ -69,8 +66,6 @@ import Constants	( mAX_TUPLE_SIZE )
 import Module		( Module )
 import RdrName
 import Name
-import OccName		( mkTcOccFS, mkDataOccFS, mkTupleOcc, mkDataConWorkerOcc,
-			  tcName, dataName )
 import DataCon		( DataCon, mkDataCon, dataConWorkId, dataConSourceArity )
 import Var
 import TyCon		( TyCon, AlgTyConRhs(DataTyCon), tyConDataCons,
@@ -88,7 +83,7 @@ import Coercion         ( unsafeCoercionTyCon, symCoercionTyCon,
 import TypeRep          ( mkArrowKinds, liftedTypeKind, ubxTupleKind )
 import Unique		( incrUnique, mkTupleTyConUnique,
 			  mkTupleDataConUnique, mkPArrDataConUnique )
-import Array
+import Data.Array
 import FastString
 import Outputable
 
@@ -223,7 +218,6 @@ pcTyCon is_enum is_rec name tyvars cons
                 tyvars
                 []		-- No stupid theta
 		(DataTyCon cons is_enum)
-		[] 		-- No record selectors
 		NoParentTyCon
                 is_rec
 		True		-- All the wired-in tycons have generics
@@ -332,6 +326,7 @@ unboxedPairDataCon :: DataCon
 unboxedPairDataCon = tupleCon   Unboxed 2
 \end{code}
 
+
 %************************************************************************
 %*									*
 \subsection[TysWiredIn-boxed-prim]{The ``boxed primitive'' types (@Char@, @Int@, etc)}
@@ -539,11 +534,17 @@ done by enumeration\srcloc{lib/prelude/InTup?.hs}.
 \end{itemize}
 
 \begin{code}
-mkTupleTy :: Boxity -> Int -> [Type] -> Type
-mkTupleTy boxity arity tys = mkTyConApp (tupleTyCon boxity arity) tys
+mkTupleTy :: Boxity -> [Type] -> Type
+-- Special case for *boxed* 1-tuples, which are represented by the type itself
+mkTupleTy boxity [ty] | Boxed <- boxity = ty
+mkTupleTy boxity tys = mkTyConApp (tupleTyCon boxity (length tys)) tys
+
+-- | Build the type of a small tuple that holds the specified type of thing
+mkBoxedTupleTy :: [Type] -> Type
+mkBoxedTupleTy tys = mkTupleTy Boxed tys
 
 unitTy :: Type
-unitTy = mkTupleTy Boxed 0 []
+unitTy = mkTupleTy Boxed []
 \end{code}
 
 %************************************************************************