%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[HsTypes]{Abstract syntax: user-defined types}
-If compiled without \tr{#define COMPILING_GHC}, you get
-(part of) a Haskell-abstract-syntax library. With it,
-you get part of GHC.
-
\begin{code}
-#include "HsVersions.h"
-
module HsTypes (
- PolyType(..), MonoType(..),
- Context(..), ClassAssertion(..)
-
-#ifdef COMPILING_GHC
- , pprParendMonoType, pprContext
- , extractMonoTyNames, extractCtxtTyNames
- , cmpPolyType, cmpMonoType, cmpContext
-#endif
+ HsType(..), LHsType,
+ HsTyVarBndr(..), LHsTyVarBndr,
+ HsExplicitForAll(..),
+ HsContext, LHsContext,
+ HsPred(..), LHsPred,
+
+ LBangType, BangType, HsBang(..),
+ getBangType, getBangStrictness,
+
+ mkExplicitHsForAllTy, mkImplicitHsForAllTy,
+ hsTyVarName, hsTyVarNames, replaceTyVarName,
+ hsLTyVarName, hsLTyVarNames, hsLTyVarLocName, hsLTyVarLocNames,
+ splitHsInstDeclTy, splitHsFunType,
+
+ -- Type place holder
+ PostTcType, placeHolderType,
+
+ -- Printing
+ pprParendHsType, pprHsForAll, pprHsContext, ppr_hs_context, pprHsTyVarBndr
) where
-#ifdef COMPILING_GHC
-import Ubiq
+#include "HsVersions.h"
+
+import {-# SOURCE #-} HsExpr ( HsSplice, pprSplice )
+
+import Type ( Type )
+import Kind ( {- instance Outputable Kind -}, Kind,
+ pprParendKind, pprKind, isLiftedTypeKind )
+import BasicTypes ( IPName, Boxity, tupleParens )
+import SrcLoc ( Located(..), unLoc, noSrcSpan )
+import StaticFlags ( opt_PprStyle_Debug )
+import Outputable
+\end{code}
+
+
+%************************************************************************
+%* *
+\subsection{Annotating the syntax}
+%* *
+%************************************************************************
-import Outputable ( interppSP, ifnotPprForUser )
-import Pretty
-import Type ( Kind )
-import Util ( thenCmp, cmpList, isIn, panic# )
+\begin{code}
+type PostTcType = Type -- Used for slots in the abstract syntax
+ -- where we want to keep slot for a type
+ -- to be added by the type checker...but
+ -- before typechecking it's just bogus
-#endif {- COMPILING_GHC -}
+placeHolderType :: PostTcType -- Used before typechecking
+placeHolderType = panic "Evaluated the place holder for a PostTcType"
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{Bang annotations}
+%* *
+%************************************************************************
+
+\begin{code}
+type LBangType name = Located (BangType name)
+type BangType name = HsType name -- Bangs are in the HsType data type
+
+data HsBang = HsNoBang -- Only used as a return value for getBangStrictness,
+ -- never appears on a HsBangTy
+ | HsStrict -- !
+ | HsUnbox -- {-# UNPACK #-} ! (GHC extension, meaning "unbox")
+
+instance Outputable HsBang where
+ ppr (HsNoBang) = empty
+ ppr (HsStrict) = char '!'
+ ppr (HsUnbox) = ptext SLIT("!!")
+
+getBangType :: LHsType a -> LHsType a
+getBangType (L _ (HsBangTy _ ty)) = ty
+getBangType ty = ty
+
+getBangStrictness :: LHsType a -> HsBang
+getBangStrictness (L _ (HsBangTy s _)) = s
+getBangStrictness _ = HsNoBang
\end{code}
+
+%************************************************************************
+%* *
+\subsection{Data types}
+%* *
+%************************************************************************
+
This is the syntax for types as seen in type signatures.
\begin{code}
-data PolyType name
- = HsPreForAllTy (Context name)
- (MonoType name)
+type LHsContext name = Located (HsContext name)
- -- The renamer turns HsPreForAllTys into HsForAllTys when they
- -- occur in signatures, to make the binding of variables
- -- explicit. This distinction is made visible for
- -- non-COMPILING_GHC code, because you probably want to do the
- -- same thing.
+type HsContext name = [LHsPred name]
- | HsForAllTy [name]
- (Context name)
- (MonoType name)
+type LHsPred name = Located (HsPred name)
-type Context name = [ClassAssertion name]
+data HsPred name = HsClassP name [LHsType name]
+ | HsIParam (IPName name) (LHsType name)
-type ClassAssertion name = (name, name)
+type LHsType name = Located (HsType name)
-data MonoType name
- = MonoTyVar name -- Type variable
+data HsType name
+ = HsForAllTy HsExplicitForAll -- Renamer leaves this flag unchanged, to record the way
+ -- the user wrote it originally, so that the printer can
+ -- print it as the user wrote it
+ [LHsTyVarBndr name] -- With ImplicitForAll, this is the empty list
+ -- until the renamer fills in the variables
+ (LHsContext name)
+ (LHsType name)
- | MonoTyApp name -- Type constructor or variable
- [MonoType name]
+ | HsTyVar name -- Type variable or type constructor
- -- We *could* have a "MonoTyCon name" equiv to "MonoTyApp name []"
- -- (for efficiency, what?) WDP 96/02/18
+ | HsBangTy HsBang (LHsType name) -- Bang-style type annotations
- | MonoFunTy (MonoType name) -- function type
- (MonoType name)
+ | HsAppTy (LHsType name)
+ (LHsType name)
- | MonoListTy (MonoType name) -- list type
- | MonoTupleTy [MonoType name] -- tuple type (length gives arity)
+ | HsFunTy (LHsType name) -- function type
+ (LHsType name)
-#ifdef COMPILING_GHC
- -- these next two are only used in unfoldings in interfaces
- | MonoDictTy name -- Class
- (MonoType name)
+ | HsListTy (LHsType name) -- Element type
- | MonoForAllTy [(name, Kind)]
- (MonoType name)
- -- *** NOTA BENE *** A "monotype" in a pragma can have
- -- for-alls in it, (mostly to do with dictionaries). These
- -- must be explicitly Kinded.
+ | HsPArrTy (LHsType name) -- Elem. type of parallel array: [:t:]
-#endif {- COMPILING_GHC -}
-\end{code}
+ | HsTupleTy Boxity
+ [LHsType name] -- Element types (length gives arity)
-This is used in various places:
-\begin{code}
-#ifdef COMPILING_GHC
-pprContext :: (Outputable name) => PprStyle -> (Context name) -> Pretty
-
-pprContext sty [] = ppNil
-pprContext sty [(clas, ty)] = ppCat [ppr sty clas, ppr sty ty, ppStr "=>"]
-pprContext sty context
- = ppBesides [ppLparen,
- ppInterleave ppComma (map pp_assert context),
- ppRparen, ppStr " =>"]
- where
- pp_assert (clas, ty)
- = ppCat [ppr sty clas, ppr sty ty]
-\end{code}
+ | HsOpTy (LHsType name) (Located name) (LHsType name)
-\begin{code}
-instance (Outputable name) => Outputable (PolyType name) where
- ppr sty (HsPreForAllTy ctxt ty)
- = print_it sty ppNil ctxt ty
- ppr sty (HsForAllTy tvs ctxt ty)
- = print_it sty
- (ppBesides [ppStr "_forall_ ", interppSP sty tvs, ppStr " => "])
- ctxt ty
+ | HsParTy (LHsType name)
+ -- Parenthesis preserved for the precedence re-arrangement in RnTypes
+ -- It's important that a * (b + c) doesn't get rearranged to (a*b) + c!
+ --
+ -- However, NB that toHsType doesn't add HsParTys (in an effort to keep
+ -- interface files smaller), so when printing a HsType we may need to
+ -- add parens.
-print_it sty pp_forall ctxt ty
- = ppCat [ifnotPprForUser sty pp_forall, -- print foralls unless PprForUser
- pprContext sty ctxt, ppr sty ty]
+ | HsNumTy Integer -- Generics only
-instance (Outputable name) => Outputable (MonoType name) where
- ppr = pprMonoType
+ | HsPredTy (HsPred name) -- Only used in the type of an instance
+ -- declaration, eg. Eq [a] -> Eq a
+ -- ^^^^
+ -- HsPredTy
+ -- Note no need for location info on the
+ -- enclosed HsPred; the one on the type will do
-pREC_TOP = (0 :: Int)
-pREC_FUN = (1 :: Int)
-pREC_CON = (2 :: Int)
+ | HsKindSig (LHsType name) -- (ty :: kind)
+ Kind -- A type with a kind signature
--- printing works more-or-less as for Types
+ | HsSpliceTy (HsSplice name)
-pprMonoType, pprParendMonoType :: (Outputable name) => PprStyle -> MonoType name -> Pretty
+data HsExplicitForAll = Explicit | Implicit
-pprMonoType sty ty = ppr_mono_ty sty pREC_TOP ty
-pprParendMonoType sty ty = ppr_mono_ty sty pREC_CON ty
+-----------------------
+-- Combine adjacent for-alls.
+-- The following awkward situation can happen otherwise:
+-- f :: forall a. ((Num a) => Int)
+-- might generate HsForAll (Just [a]) [] (HsForAll Nothing [Num a] t)
+-- Then a isn't discovered as ambiguous, and we abstract the AbsBinds wrt []
+-- but the export list abstracts f wrt [a]. Disaster.
+--
+-- A valid type must have one for-all at the top of the type, or of the fn arg types
-ppr_mono_ty sty ctxt_prec (MonoTyVar name) = ppr sty name
+mkImplicitHsForAllTy ctxt ty = mkHsForAllTy Implicit [] ctxt ty
+mkExplicitHsForAllTy tvs ctxt ty = mkHsForAllTy Explicit tvs ctxt ty
-ppr_mono_ty sty ctxt_prec (MonoFunTy ty1 ty2)
- = let p1 = ppr_mono_ty sty pREC_FUN ty1
- p2 = ppr_mono_ty sty pREC_TOP ty2
- in
- if ctxt_prec < pREC_FUN then -- no parens needed
- ppSep [p1, ppBeside (ppStr "-> ") p2]
- else
- ppSep [ppBeside ppLparen p1, ppBesides [ppStr "-> ", p2, ppRparen]]
-
-ppr_mono_ty sty ctxt_prec (MonoTupleTy tys)
- = ppBesides [ppLparen, ppInterleave ppComma (map (ppr sty) tys), ppRparen]
-
-ppr_mono_ty sty ctxt_prec (MonoListTy ty)
- = ppBesides [ppLbrack, ppr_mono_ty sty pREC_TOP ty, ppRbrack]
-
-ppr_mono_ty sty ctxt_prec (MonoTyApp tycon tys)
- = let pp_tycon = ppr sty tycon in
- if null tys then
- pp_tycon
- else if ctxt_prec < pREC_CON then -- no parens needed
- ppCat [pp_tycon, ppInterleave ppNil (map (ppr_mono_ty sty pREC_CON) tys)]
- else
- ppBesides [ ppLparen, pp_tycon, ppSP,
- ppInterleave ppNil (map (ppr_mono_ty sty pREC_CON) tys), ppRparen ]
-
--- unfoldings only
-ppr_mono_ty sty ctxt_prec (MonoDictTy clas ty)
- = ppBesides [ppStr "{{", ppr sty clas, ppSP, ppr_mono_ty sty ctxt_prec ty, ppStr "}}"]
-
-#endif {- COMPILING_GHC -}
-\end{code}
+mkHsForAllTy :: HsExplicitForAll -> [LHsTyVarBndr name] -> LHsContext name -> LHsType name -> HsType name
+-- Smart constructor for HsForAllTy
+mkHsForAllTy exp tvs (L _ []) ty = mk_forall_ty exp tvs ty
+mkHsForAllTy exp tvs ctxt ty = HsForAllTy exp tvs ctxt ty
-\begin{code}
-#ifdef COMPILING_GHC
+-- mk_forall_ty makes a pure for-all type (no context)
+mk_forall_ty exp tvs (L _ (HsParTy ty)) = mk_forall_ty exp tvs ty
+mk_forall_ty exp1 tvs1 (L _ (HsForAllTy exp2 tvs2 ctxt ty)) = mkHsForAllTy (exp1 `plus` exp2) (tvs1 ++ tvs2) ctxt ty
+mk_forall_ty exp tvs ty = HsForAllTy exp tvs (L noSrcSpan []) ty
+ -- Even if tvs is empty, we still make a HsForAll!
+ -- In the Implicit case, this signals the place to do implicit quantification
+ -- In the Explicit case, it prevents implicit quantification
+ -- (see the sigtype production in Parser.y.pp)
+ -- so that (forall. ty) isn't implicitly quantified
-extractCtxtTyNames :: Eq name => Context name -> [name]
-extractMonoTyNames :: Eq name => MonoType name -> [name]
+Implicit `plus` Implicit = Implicit
+exp1 `plus` exp2 = Explicit
-extractCtxtTyNames ctxt
- = foldr get [] ctxt
- where
- get (clas, tv) acc
- | tv `is_elem` acc = acc
- | otherwise = tv : acc
+type LHsTyVarBndr name = Located (HsTyVarBndr name)
- is_elem = isIn "extractCtxtTyNames"
+data HsTyVarBndr name
+ = UserTyVar name
+ | KindedTyVar name Kind
+ -- *** NOTA BENE *** A "monotype" in a pragma can have
+ -- for-alls in it, (mostly to do with dictionaries). These
+ -- must be explicitly Kinded.
+
+hsTyVarName :: HsTyVarBndr name -> name
+hsTyVarName (UserTyVar n) = n
+hsTyVarName (KindedTyVar n _) = n
+
+hsLTyVarName :: LHsTyVarBndr name -> name
+hsLTyVarName = hsTyVarName . unLoc
+
+hsTyVarNames :: [HsTyVarBndr name] -> [name]
+hsTyVarNames tvs = map hsTyVarName tvs
+
+hsLTyVarNames :: [LHsTyVarBndr name] -> [name]
+hsLTyVarNames = map hsLTyVarName
+
+hsLTyVarLocName :: LHsTyVarBndr name -> Located name
+hsLTyVarLocName = fmap hsTyVarName
-extractMonoTyNames ty
- = get ty []
+hsLTyVarLocNames :: [LHsTyVarBndr name] -> [Located name]
+hsLTyVarLocNames = map hsLTyVarLocName
+
+replaceTyVarName :: HsTyVarBndr name1 -> name2 -> HsTyVarBndr name2
+replaceTyVarName (UserTyVar n) n' = UserTyVar n'
+replaceTyVarName (KindedTyVar n k) n' = KindedTyVar n' k
+\end{code}
+
+
+\begin{code}
+splitHsInstDeclTy
+ :: OutputableBndr name
+ => HsType name
+ -> ([LHsTyVarBndr name], HsContext name, name, [LHsType name])
+ -- Split up an instance decl type, returning the pieces
+
+splitHsInstDeclTy inst_ty
+ = case inst_ty of
+ HsParTy (L _ ty) -> splitHsInstDeclTy ty
+ HsForAllTy _ tvs cxt (L _ ty) -> split_tau tvs (unLoc cxt) ty
+ other -> split_tau [] [] other
+ -- The type vars should have been computed by now, even if they were implicit
+ where
+ split_tau tvs cxt (HsPredTy (HsClassP cls tys)) = (tvs, cxt, cls, tys)
+ split_tau tvs cxt (HsParTy (L _ ty)) = split_tau tvs cxt ty
+
+-- Splits HsType into the (init, last) parts
+-- Breaks up any parens in the result type:
+-- splitHsFunType (a -> (b -> c)) = ([a,b], c)
+splitHsFunType :: LHsType name -> ([LHsType name], LHsType name)
+splitHsFunType (L l (HsFunTy x y)) = (x:args, res)
where
- get (MonoTyApp con tys) acc = foldr get acc tys
- get (MonoListTy ty) acc = get ty acc
- get (MonoFunTy ty1 ty2) acc = get ty1 (get ty2 acc)
- get (MonoDictTy _ ty) acc = get ty acc
- get (MonoTupleTy tys) acc = foldr get acc tys
- get (MonoTyVar tv) acc
- | tv `is_elem` acc = acc
- | otherwise = tv : acc
-
- is_elem = isIn "extractMonoTyNames"
-
-#endif {- COMPILING_GHC -}
+ (args, res) = splitHsFunType y
+splitHsFunType (L _ (HsParTy ty)) = splitHsFunType ty
+splitHsFunType other = ([], other)
\end{code}
-We do define a specialised equality for these \tr{*Type} types; used
-in checking interfaces. Most any other use is likely to be {\em
-wrong}, so be careful!
+
+%************************************************************************
+%* *
+\subsection{Pretty printing}
+%* *
+%************************************************************************
+
+NB: these types get printed into interface files, so
+ don't change the printing format lightly
+
\begin{code}
-#ifdef COMPILING_GHC
+instance (OutputableBndr name) => Outputable (HsType name) where
+ ppr ty = pprHsType ty
-cmpPolyType :: (a -> a -> TAG_) -> PolyType a -> PolyType a -> TAG_
-cmpMonoType :: (a -> a -> TAG_) -> MonoType a -> MonoType a -> TAG_
-cmpContext :: (a -> a -> TAG_) -> Context a -> Context a -> TAG_
+instance (Outputable name) => Outputable (HsTyVarBndr name) where
+ ppr (UserTyVar name) = ppr name
+ ppr (KindedTyVar name kind) = pprHsTyVarBndr name kind
--- We assume that HsPreForAllTys have been smashed by now.
-# ifdef DEBUG
-cmpPolyType _ (HsPreForAllTy _ _) _ = panic# "cmpPolyType:HsPreForAllTy:1st arg"
-cmpPolyType _ _ (HsPreForAllTy _ _) = panic# "cmpPolyType:HsPreForAllTy:2nd arg"
-# endif
+instance OutputableBndr name => Outputable (HsPred name) where
+ ppr (HsClassP clas tys) = ppr clas <+> hsep (map (pprParendHsType.unLoc) tys)
+ ppr (HsIParam n ty) = hsep [ppr n, dcolon, ppr ty]
-cmpPolyType cmp (HsForAllTy tvs1 c1 t1) (HsForAllTy tvs2 c2 t2)
- = thenCmp (cmp_tvs tvs1 tvs2)
- (thenCmp (cmpContext cmp c1 c2) (cmpMonoType cmp t1 t2))
+pprHsTyVarBndr :: Outputable name => name -> Kind -> SDoc
+pprHsTyVarBndr name kind | isLiftedTypeKind kind = ppr name
+ | otherwise = hsep [ppr name, dcolon, pprParendKind kind]
+
+pprHsForAll exp tvs cxt
+ | show_forall = forall_part <+> pprHsContext (unLoc cxt)
+ | otherwise = pprHsContext (unLoc cxt)
where
- cmp_tvs [] [] = EQ_
- cmp_tvs [] _ = LT_
- cmp_tvs _ [] = GT_
- cmp_tvs (a:as) (b:bs)
- = thenCmp (cmp a b) (cmp_tvs as bs)
- cmp_tvs _ _ = panic# "cmp_tvs"
-
------------
-cmpMonoType cmp (MonoTyVar n1) (MonoTyVar n2)
- = cmp n1 n2
-
-cmpMonoType cmp (MonoTupleTy tys1) (MonoTupleTy tys2)
- = cmpList (cmpMonoType cmp) tys1 tys2
-cmpMonoType cmp (MonoListTy ty1) (MonoListTy ty2)
- = cmpMonoType cmp ty1 ty2
-
-cmpMonoType cmp (MonoTyApp tc1 tys1) (MonoTyApp tc2 tys2)
- = thenCmp (cmp tc1 tc2) (cmpList (cmpMonoType cmp) tys1 tys2)
-
-cmpMonoType cmp (MonoFunTy a1 b1) (MonoFunTy a2 b2)
- = thenCmp (cmpMonoType cmp a1 a2) (cmpMonoType cmp b1 b2)
-
-cmpMonoType cmp (MonoDictTy c1 ty1) (MonoDictTy c2 ty2)
- = thenCmp (cmp c1 c2) (cmpMonoType cmp ty1 ty2)
-
-cmpMonoType cmp ty1 ty2 -- tags must be different
- = let tag1 = tag ty1
- tag2 = tag ty2
+ show_forall = opt_PprStyle_Debug
+ || (not (null tvs) && is_explicit)
+ is_explicit = case exp of {Explicit -> True; Implicit -> False}
+ forall_part = ptext SLIT("forall") <+> interppSP tvs <> dot
+
+pprHsContext :: (OutputableBndr name) => HsContext name -> SDoc
+pprHsContext [] = empty
+pprHsContext cxt = ppr_hs_context cxt <+> ptext SLIT("=>")
+
+ppr_hs_context [] = empty
+ppr_hs_context cxt = parens (interpp'SP cxt)
+\end{code}
+
+\begin{code}
+pREC_TOP = (0 :: Int) -- type in ParseIface.y
+pREC_FUN = (1 :: Int) -- btype in ParseIface.y
+ -- Used for LH arg of (->)
+pREC_OP = (2 :: Int) -- Used for arg of any infix operator
+ -- (we don't keep their fixities around)
+pREC_CON = (3 :: Int) -- Used for arg of type applicn:
+ -- always parenthesise unless atomic
+
+maybeParen :: Int -- Precedence of context
+ -> Int -- Precedence of top-level operator
+ -> SDoc -> SDoc -- Wrap in parens if (ctxt >= op)
+maybeParen ctxt_prec op_prec p | ctxt_prec >= op_prec = parens p
+ | otherwise = p
+
+-- printing works more-or-less as for Types
+
+pprHsType, pprParendHsType :: (OutputableBndr name) => HsType name -> SDoc
+
+pprHsType ty = getPprStyle $ \sty -> ppr_mono_ty pREC_TOP (prepare sty ty)
+pprParendHsType ty = ppr_mono_ty pREC_CON ty
+
+-- Before printing a type
+-- (a) Remove outermost HsParTy parens
+-- (b) Drop top-level for-all type variables in user style
+-- since they are implicit in Haskell
+prepare sty (HsParTy ty) = prepare sty (unLoc ty)
+prepare sty ty = ty
+
+ppr_mono_lty ctxt_prec ty = ppr_mono_ty ctxt_prec (unLoc ty)
+
+ppr_mono_ty ctxt_prec (HsForAllTy exp tvs ctxt ty)
+ = maybeParen ctxt_prec pREC_FUN $
+ sep [pprHsForAll exp tvs ctxt, ppr_mono_lty pREC_TOP ty]
+
+-- gaw 2004
+ppr_mono_ty ctxt_prec (HsBangTy b ty) = ppr b <> ppr ty
+ppr_mono_ty ctxt_prec (HsTyVar name) = ppr name
+ppr_mono_ty ctxt_prec (HsFunTy ty1 ty2) = ppr_fun_ty ctxt_prec ty1 ty2
+ppr_mono_ty ctxt_prec (HsTupleTy con tys) = tupleParens con (interpp'SP tys)
+ppr_mono_ty ctxt_prec (HsKindSig ty kind) = parens (ppr_mono_lty pREC_TOP ty <+> dcolon <+> pprKind kind)
+ppr_mono_ty ctxt_prec (HsListTy ty) = brackets (ppr_mono_lty pREC_TOP ty)
+ppr_mono_ty ctxt_prec (HsPArrTy ty) = pabrackets (ppr_mono_lty pREC_TOP ty)
+ppr_mono_ty ctxt_prec (HsPredTy pred) = braces (ppr pred)
+ppr_mono_ty ctxt_prec (HsNumTy n) = integer n -- generics only
+ppr_mono_ty ctxt_prec (HsSpliceTy s) = pprSplice s
+
+ppr_mono_ty ctxt_prec (HsAppTy fun_ty arg_ty)
+ = maybeParen ctxt_prec pREC_CON $
+ hsep [ppr_mono_lty pREC_FUN fun_ty, ppr_mono_lty pREC_CON arg_ty]
+
+ppr_mono_ty ctxt_prec (HsOpTy ty1 op ty2)
+ = maybeParen ctxt_prec pREC_OP $
+ ppr_mono_lty pREC_OP ty1 <+> ppr op <+> ppr_mono_lty pREC_OP ty2
+
+ppr_mono_ty ctxt_prec (HsParTy ty)
+ = parens (ppr_mono_lty pREC_TOP ty)
+ -- Put the parens in where the user did
+ -- But we still use the precedence stuff to add parens because
+ -- toHsType doesn't put in any HsParTys, so we may still need them
+
+--------------------------
+ppr_fun_ty ctxt_prec ty1 ty2
+ = let p1 = ppr_mono_lty pREC_FUN ty1
+ p2 = ppr_mono_lty pREC_TOP ty2
in
- if tag1 _LT_ tag2 then LT_ else GT_
- where
- tag (MonoTyVar n1) = (ILIT(1) :: FAST_INT)
- tag (MonoTupleTy tys1) = ILIT(2)
- tag (MonoListTy ty1) = ILIT(3)
- tag (MonoTyApp tc1 tys1) = ILIT(4)
- tag (MonoFunTy a1 b1) = ILIT(5)
- tag (MonoDictTy c1 ty1) = ILIT(7)
-
--------------------
-cmpContext cmp a b
- = cmpList cmp_ctxt a b
- where
- cmp_ctxt (c1, tv1) (c2, tv2)
- = thenCmp (cmp c1 c2) (cmp tv1 tv2)
+ maybeParen ctxt_prec pREC_FUN $
+ sep [p1, ptext SLIT("->") <+> p2]
-#endif {- COMPILING_GHC -}
+--------------------------
+pabrackets p = ptext SLIT("[:") <> p <> ptext SLIT(":]")
\end{code}
+
+