%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[HsDecls]{Abstract syntax: global declarations}
-Definitions for: @FixityDecl@, @TyDecl@ and @ConDecl@, @ClassDecl@,
-@InstDecl@, @DefaultDecl@.
+Definitions for: @TyDecl@ and @ConDecl@, @ClassDecl@,
+@InstDecl@, @DefaultDecl@ and @ForeignDecl@.
\begin{code}
-#include "HsVersions.h"
-
-module HsDecls where
+module HsDecls (
+ HsDecl(..), TyClDecl(..), InstDecl(..), RuleDecl(..), RuleBndr(..),
+ DefaultDecl(..), ForeignDecl(..), ForKind(..),
+ ExtName(..), isDynamic,
+ ConDecl(..), ConDetails(..), BangType(..),
+ IfaceSig(..), SpecDataSig(..),
+ hsDeclName, tyClDeclName, isClassDecl, isSynDecl, isDataDecl, countTyClDecls
+ ) where
-IMP_Ubiq()
+#include "HsVersions.h"
-- friends:
-import HsBinds ( HsBinds, MonoBinds, Sig, nullMonoBinds )
-import HsPragmas ( DataPragmas, ClassPragmas,
- InstancePragmas, ClassOpPragmas
- )
+import HsBinds ( HsBinds, MonoBinds, Sig, FixitySig(..), nullMonoBinds )
+import HsExpr ( HsExpr )
+import HsPragmas ( DataPragmas, ClassPragmas )
import HsTypes
-import IdInfo
-import SpecEnv ( SpecEnv )
-import HsCore ( UfExpr )
+import HsCore ( UfExpr, UfBinder, IfaceSig(..), UfRuleBody )
+import BasicTypes ( Fixity, NewOrData(..) )
+import CallConv ( CallConv, pprCallConv )
+import Var ( TyVar )
-- others:
-import Name ( pprSym, pprNonSym, getOccName, OccName )
-import Outputable ( interppSP, interpp'SP,
- Outputable(..){-instance * []-}
- )
-import Pretty
+import PprType
+import Outputable
import SrcLoc ( SrcLoc )
-import PprStyle ( PprStyle(..) )
+import Util
\end{code}
%************************************************************************
\begin{code}
-data HsDecl tyvar uvar name pat
- = TyD (TyDecl name)
- | ClD (ClassDecl tyvar uvar name pat)
- | InstD (InstDecl tyvar uvar name pat)
+data HsDecl name pat
+ = TyClD (TyClDecl name pat)
+ | InstD (InstDecl name pat)
| DefD (DefaultDecl name)
- | ValD (HsBinds tyvar uvar name pat)
+ | ValD (HsBinds name pat)
+ | ForD (ForeignDecl name)
| SigD (IfaceSig name)
+ | FixD (FixitySig name)
+ | RuleD (RuleDecl name pat)
+
+-- NB: all top-level fixity decls are contained EITHER
+-- EITHER FixDs
+-- OR in the ClassDecls in TyClDs
+--
+-- The former covers
+-- a) data constructors
+-- b) class methods (but they can be also done in the
+-- signatures of class decls)
+-- c) imported functions (that have an IfacSig)
+-- d) top level decls
+--
+-- The latter is for class methods only
\end{code}
\begin{code}
-hsDeclName (TyD (TyData _ name _ _ _ _ _)) = name
-hsDeclName (TyD (TyNew _ name _ _ _ _ _)) = name
-hsDeclName (TyD (TySynonym name _ _ _)) = name
-hsDeclName (ClD (ClassDecl _ name _ _ _ _ _)) = name
-hsDeclName (SigD (IfaceSig name _ _ _)) = name
+#ifdef DEBUG
+hsDeclName :: (Outputable name, Outputable pat)
+ => HsDecl name pat -> name
+#endif
+hsDeclName (TyClD decl) = tyClDeclName decl
+hsDeclName (SigD (IfaceSig name _ _ _)) = name
+hsDeclName (InstD (InstDecl _ _ _ name _)) = name
+hsDeclName (ForD (ForeignDecl name _ _ _ _ _)) = name
+hsDeclName (FixD (FixitySig name _ _)) = name
-- Others don't make sense
+#ifdef DEBUG
+hsDeclName x = pprPanic "HsDecls.hsDeclName" (ppr x)
+#endif
+
+tyClDeclName :: TyClDecl name pat -> name
+tyClDeclName (TyData _ _ name _ _ _ _ _) = name
+tyClDeclName (TySynonym name _ _ _) = name
+tyClDeclName (ClassDecl _ name _ _ _ _ _ _ _ _) = name
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => Outputable (HsDecl tyvar uvar name pat) where
-
- ppr sty (TyD td) = ppr sty td
- ppr sty (ClD cd) = ppr sty cd
- ppr sty (SigD sig) = ppr sty sig
- ppr sty (ValD binds) = ppr sty binds
- ppr sty (DefD def) = ppr sty def
- ppr sty (InstD inst) = ppr sty inst
-\end{code}
-
-
-%************************************************************************
-%* *
-\subsection[FixityDecl]{A fixity declaration}
-%* *
-%************************************************************************
-
-\begin{code}
-data FixityDecl name = FixityDecl name Fixity SrcLoc
-
-instance Outputable name => Outputable (FixityDecl name) where
- ppr sty (FixityDecl name fixity loc) = ppSep [ppr sty fixity, ppr sty name]
-\end{code}
-
-It's convenient to keep the source location in the @Fixity@; it makes error reporting
-in the renamer easier.
-
-\begin{code}
-data Fixity = Fixity Int FixityDirection
-data FixityDirection = InfixL | InfixR | InfixN
- deriving(Eq)
-
-instance Outputable Fixity where
- ppr sty (Fixity prec dir) = ppBesides [ppr sty dir, ppSP, ppInt prec]
-
-instance Outputable FixityDirection where
- ppr sty InfixL = ppStr "infixl"
- ppr sty InfixR = ppStr "infixr"
- ppr sty InfixN = ppStr "infix"
-
-instance Eq Fixity where -- Used to determine if two fixities conflict
- (Fixity p1 dir1) == (Fixity p2 dir2) = p1==p2 && dir1 == dir2
+instance (Outputable name, Outputable pat)
+ => Outputable (HsDecl name pat) where
+
+ ppr (TyClD dcl) = ppr dcl
+ ppr (SigD sig) = ppr sig
+ ppr (ValD binds) = ppr binds
+ ppr (DefD def) = ppr def
+ ppr (InstD inst) = ppr inst
+ ppr (ForD fd) = ppr fd
+ ppr (FixD fd) = ppr fd
+ ppr (RuleD rd) = ppr rd
\end{code}
%************************************************************************
\begin{code}
-data TyDecl name
- = TyData (Context name) -- context
+data TyClDecl name pat
+ = TyData NewOrData
+ (Context name) -- context
name -- type constructor
[HsTyVar name] -- type variables
[ConDecl name] -- data constructors (empty if abstract)
(DataPragmas name)
SrcLoc
- | TyNew (Context name) -- context
- name -- type constructor
- [HsTyVar name] -- type variables
- (ConDecl name) -- data constructor
- (Maybe [name]) -- derivings; as above
- (DataPragmas name)
- SrcLoc
-
| TySynonym name -- type constructor
[HsTyVar name] -- type variables
(HsType name) -- synonym expansion
SrcLoc
+ | ClassDecl (Context name) -- context...
+ name -- name of the class
+ [HsTyVar name] -- the class type variables
+ [Sig name] -- methods' signatures
+ (MonoBinds name pat) -- default methods
+ (ClassPragmas name)
+ name name [name] -- The names of the tycon, datacon, and superclass selectors
+ -- for this class. These are filled in as the ClassDecl is made.
+ SrcLoc
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name)
- => Outputable (TyDecl name) where
+countTyClDecls :: [TyClDecl name pat] -> (Int, Int, Int, Int)
+ -- class, data, newtype, synonym decls
+countTyClDecls decls
+ = (length [() | ClassDecl _ _ _ _ _ _ _ _ _ _ <- decls],
+ length [() | TyData DataType _ _ _ _ _ _ _ <- decls],
+ length [() | TyData NewType _ _ _ _ _ _ _ <- decls],
+ length [() | TySynonym _ _ _ _ <- decls])
- ppr sty (TySynonym tycon tyvars mono_ty src_loc)
- = ppHang (pp_decl_head sty SLIT("type") ppNil tycon tyvars)
- 4 (ppr sty mono_ty)
+isDataDecl, isSynDecl, isClassDecl :: TyClDecl name pat -> Bool
- ppr sty (TyData context tycon tyvars condecls derivings pragmas src_loc)
- = pp_tydecl sty
- (pp_decl_head sty SLIT("data") (pp_context_and_arrow sty context) tycon tyvars)
- (pp_condecls sty condecls)
- derivings
+isSynDecl (TySynonym _ _ _ _) = True
+isSynDecl other = False
+
+isDataDecl (TyData _ _ _ _ _ _ _ _) = True
+isDataDecl other = False
+
+isClassDecl (ClassDecl _ _ _ _ _ _ _ _ _ _) = True
+isClassDecl other = False
+\end{code}
+
+\begin{code}
+instance (Outputable name, Outputable pat)
+ => Outputable (TyClDecl name pat) where
- ppr sty (TyNew context tycon tyvars condecl derivings pragmas src_loc)
- = pp_tydecl sty
- (pp_decl_head sty SLIT("newtype") (pp_context_and_arrow sty context) tycon tyvars)
- (ppr sty condecl)
+ ppr (TySynonym tycon tyvars mono_ty src_loc)
+ = hang (pp_decl_head SLIT("type") empty tycon tyvars)
+ 4 (ppr mono_ty)
+
+ ppr (TyData new_or_data context tycon tyvars condecls derivings pragmas src_loc)
+ = pp_tydecl
+ (pp_decl_head keyword (pprContext context) tycon tyvars)
+ (pp_condecls condecls)
derivings
+ where
+ keyword = case new_or_data of
+ NewType -> SLIT("newtype")
+ DataType -> SLIT("data")
-pp_decl_head sty str pp_context tycon tyvars
- = ppCat [ppPStr str, pp_context, ppr sty (getOccName tycon),
- interppSP sty tyvars, ppPStr SLIT("=")]
+ ppr (ClassDecl context clas tyvars sigs methods pragmas _ _ _ src_loc)
+ | null sigs -- No "where" part
+ = top_matter
-pp_condecls sty [] = ppNil -- Curious!
-pp_condecls sty (c:cs)
- = ppSep (ppr sty c : map (\ c -> ppBeside (ppStr "| ") (ppr sty c)) cs)
+ | otherwise -- Laid out
+ = sep [hsep [top_matter, ptext SLIT("where {")],
+ nest 4 (vcat [sep (map ppr_sig sigs),
+ ppr methods,
+ char '}'])]
+ where
+ top_matter = hsep [ptext SLIT("class"), pprContext context,
+ ppr clas, hsep (map (ppr) tyvars)]
+ ppr_sig sig = ppr sig <> semi
-pp_tydecl sty pp_head pp_decl_rhs derivings
- = ppHang pp_head 4 (ppSep [
+
+pp_decl_head str pp_context tycon tyvars
+ = hsep [ptext str, pp_context, ppr tycon,
+ interppSP tyvars, ptext SLIT("=")]
+
+pp_condecls [] = empty -- Curious!
+pp_condecls (c:cs) = sep (ppr c : map (\ c -> ptext SLIT("|") <+> ppr c) cs)
+
+pp_tydecl pp_head pp_decl_rhs derivings
+ = hang pp_head 4 (sep [
pp_decl_rhs,
- case (derivings, sty) of
- (Nothing,_) -> ppNil
- (_,PprInterface) -> ppNil -- No derivings in interfaces
- (Just ds,_) -> ppCat [ppPStr SLIT("deriving"), ppParens (interpp'SP sty ds)]
+ case derivings of
+ Nothing -> empty
+ Just ds -> hsep [ptext SLIT("deriving"), parens (interpp'SP ds)]
])
-
-pp_context_and_arrow :: Outputable name => PprStyle -> Context name -> Pretty
-pp_context_and_arrow sty [] = ppNil
-pp_context_and_arrow sty theta = ppCat [pprContext sty theta, ppPStr SLIT("=>")]
\end{code}
A type for recording what types a datatype should be specialised to.
(HsType name)
SrcLoc
-instance (NamedThing name, Outputable name)
+instance (Outputable name)
=> Outputable (SpecDataSig name) where
- ppr sty (SpecDataSig tycon ty _)
- = ppCat [ppStr "{-# SPECIALIZE data", ppr sty ty, ppStr "#-}"]
+ ppr (SpecDataSig tycon ty _)
+ = hsep [text "{-# SPECIALIZE data", ppr ty, text "#-}"]
\end{code}
%************************************************************************
\begin{code}
data ConDecl name
- = ConDecl name -- prefix-style con decl
- [BangType name]
+ = ConDecl name -- Constructor name
+
+ [HsTyVar name] -- Existentially quantified type variables
+ (Context name) -- ...and context
+ -- If both are empty then there are no existentials
+
+ (ConDetails name)
SrcLoc
- | ConOpDecl (BangType name) -- infix-style con decl
- name
+data ConDetails name
+ = VanillaCon -- prefix-style con decl
+ [BangType name]
+
+ | InfixCon -- infix-style con decl
+ (BangType name)
(BangType name)
- SrcLoc
- | RecConDecl name
+ | RecCon -- record-style con decl
[([name], BangType name)] -- list of "fields"
- SrcLoc
- | NewConDecl name -- newtype con decl
+ | NewCon -- newtype con decl, possibly with a labelled field.
(HsType name)
- SrcLoc
+ (Maybe name) -- Just x => labelled field 'x'
data BangType name
= Banged (HsType name) -- HsType: to allow Haskell extensions
| Unbanged (HsType name) -- (MonoType only needed for straight Haskell)
+ | Unpacked (HsType name) -- Field is strict and to be unpacked if poss.
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name) => Outputable (ConDecl name) where
-
- ppr sty (ConDecl con tys _)
- = ppCat [ppr sty (getOccName con), ppInterleave ppNil (map (ppr_bang sty) tys)]
-
- -- We print ConOpDecls in prefix form in interface files
- ppr PprInterface (ConOpDecl ty1 op ty2 _)
- = ppCat [ppr PprInterface (getOccName op), ppr_bang PprInterface ty1, ppr_bang PprInterface ty2]
- ppr sty (ConOpDecl ty1 op ty2 _)
- = ppCat [ppr_bang sty ty1, ppr sty (getOccName op), ppr_bang sty ty2]
-
- ppr sty (NewConDecl con ty _)
- = ppCat [ppr sty (getOccName con), pprParendHsType sty ty]
- ppr sty (RecConDecl con fields _)
- = ppCat [ppr sty (getOccName con),
- ppCurlies (ppInterleave pp'SP (map pp_field fields))
- ]
- where
- pp_field (n, ty) = ppCat [ppr sty n, ppPStr SLIT("::"), ppr_bang sty ty]
-
-ppr_bang sty (Banged ty) = ppBeside (ppChar '!') (pprParendHsType sty ty)
-ppr_bang sty (Unbanged ty) = pprParendHsType sty ty
-\end{code}
-
-%************************************************************************
-%* *
-\subsection[ClassDecl]{A class declaration}
-%* *
-%************************************************************************
-
-\begin{code}
-data ClassDecl tyvar uvar name pat
- = ClassDecl (Context name) -- context...
- name -- name of the class
- (HsTyVar name) -- the class type variable
- [Sig name] -- methods' signatures
- (MonoBinds tyvar uvar name pat) -- default methods
- (ClassPragmas name)
- SrcLoc
+instance (Outputable name) => Outputable (ConDecl name) where
+ ppr (ConDecl con tvs cxt con_details loc)
+ = sep [pprForAll tvs, pprContext cxt, ppr_con_details con con_details]
+
+ppr_con_details con (InfixCon ty1 ty2)
+ = hsep [ppr_bang ty1, ppr con, ppr_bang ty2]
+
+ppr_con_details con (VanillaCon tys)
+ = ppr con <+> hsep (map (ppr_bang) tys)
+
+ppr_con_details con (NewCon ty Nothing)
+ = ppr con <+> pprParendHsType ty
+
+ppr_con_details con (NewCon ty (Just x))
+ = ppr con <+> braces pp_field
+ where
+ pp_field = ppr x <+> dcolon <+> pprParendHsType ty
+
+ppr_con_details con (RecCon fields)
+ = ppr con <+> braces (hsep (punctuate comma (map ppr_field fields)))
+ where
+ ppr_field (ns, ty) = hsep (map (ppr) ns) <+>
+ dcolon <+>
+ ppr_bang ty
+
+ppr_bang (Banged ty) = ptext SLIT("!") <> pprParendHsType ty
+ppr_bang (Unbanged ty) = pprParendHsType ty
+ppr_bang (Unpacked ty) = ptext SLIT("! !") <> pprParendHsType ty
\end{code}
-\begin{code}
-instance (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => Outputable (ClassDecl tyvar uvar name pat) where
-
- ppr sty (ClassDecl context clas tyvar sigs methods pragmas src_loc)
- | null sigs -- No "where" part
- = top_matter
-
- | iface_style -- All on one line (for now at least)
- = ppCat [top_matter, ppStr "where",
- ppCurlies (ppInterleave (ppPStr SLIT("; ")) pp_sigs)]
-
- | otherwise -- Laid out
- = ppSep [ppCat [top_matter, ppStr "where {"],
- ppNest 4 ((ppIntersperse ppSemi pp_sigs `ppAbove` pp_methods)
- `ppBeside` ppStr "}")]
- where
- top_matter = ppCat [ppStr "class", pp_context_and_arrow sty context,
- ppr sty (getOccName clas), ppr sty tyvar]
- pp_sigs = map (ppr sty) sigs
- pp_methods = ppr sty methods
- iface_style = case sty of {PprInterface -> True; other -> False}
-\end{code}
%************************************************************************
%* *
-\subsection[InstDecl]{An instance declaration (also, @SpecInstSig@)}
+\subsection[InstDecl]{An instance declaration
%* *
%************************************************************************
\begin{code}
-data InstDecl tyvar uvar name pat
+data InstDecl name pat
= InstDecl (HsType name) -- Context => Class Instance-type
-- Using a polytype means that the renamer conveniently
-- figures out the quantified type variables for us.
- (MonoBinds tyvar uvar name pat)
+ (MonoBinds name pat)
[Sig name] -- User-supplied pragmatic info
- (Maybe name) -- Name for the dictionary function
+ name -- Name for the dictionary function
SrcLoc
\end{code}
\begin{code}
-instance (NamedThing name, Outputable name, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar)
- => Outputable (InstDecl tyvar uvar name pat) where
-
- ppr sty (InstDecl inst_ty binds uprags dfun_name src_loc)
- | case sty of { PprInterface -> True; other -> False} ||
- nullMonoBinds binds && null uprags
- = ppCat [ppStr "instance", ppr sty inst_ty]
-
- | otherwise
- = ppAboves [ppCat [ppStr "instance", ppr sty inst_ty, ppStr "where"],
- ppNest 4 (ppr sty uprags),
- ppNest 4 (ppr sty binds) ]
+instance (Outputable name, Outputable pat)
+ => Outputable (InstDecl name pat) where
+
+ ppr (InstDecl inst_ty binds uprags dfun_name src_loc)
+ = getPprStyle $ \ sty ->
+ if ifaceStyle sty || (nullMonoBinds binds && null uprags) then
+ hsep [ptext SLIT("instance"), ppr inst_ty]
+ else
+ vcat [hsep [ptext SLIT("instance"), ppr inst_ty, ptext SLIT("where")],
+ nest 4 (ppr uprags),
+ nest 4 (ppr binds) ]
\end{code}
-A type for recording what instances the user wants to specialise;
-called a ``Sig'' because it's sort of like a ``type signature'' for an
-instance.
-\begin{code}
-data SpecInstSig name
- = SpecInstSig name -- class
- (HsType name) -- type to specialise to
- SrcLoc
-
-instance (NamedThing name, Outputable name)
- => Outputable (SpecInstSig name) where
-
- ppr sty (SpecInstSig clas ty _)
- = ppCat [ppStr "{-# SPECIALIZE instance", ppr sty clas, ppr sty ty, ppStr "#-}"]
-\end{code}
%************************************************************************
%* *
= DefaultDecl [HsType name]
SrcLoc
-instance (NamedThing name, Outputable name)
+instance (Outputable name)
=> Outputable (DefaultDecl name) where
- ppr sty (DefaultDecl tys src_loc)
- = ppBeside (ppPStr SLIT("default ")) (ppParens (interpp'SP sty tys))
+ ppr (DefaultDecl tys src_loc)
+ = ptext SLIT("default") <+> parens (interpp'SP tys)
\end{code}
%************************************************************************
%* *
-\subsection{Signatures in interface files}
+\subsection{Foreign function interface declaration}
%* *
%************************************************************************
\begin{code}
-data IfaceSig name
- = IfaceSig name
- (HsType name)
- [HsIdInfo name]
- SrcLoc
+data ForeignDecl name =
+ ForeignDecl
+ name
+ ForKind
+ (HsType name)
+ ExtName
+ CallConv
+ SrcLoc
+
+instance (Outputable name)
+ => Outputable (ForeignDecl name) where
+
+ ppr (ForeignDecl nm imp_exp ty ext_name cconv src_loc)
+ = ptext SLIT("foreign") <+> ppr_imp_exp <+> pprCallConv cconv <+>
+ ppr ext_name <+> ppr_unsafe <+> ppr nm <+> dcolon <+> ppr ty
+ where
+ (ppr_imp_exp, ppr_unsafe) =
+ case imp_exp of
+ FoLabel -> (ptext SLIT("label"), empty)
+ FoExport -> (ptext SLIT("export"), empty)
+ FoImport us
+ | us -> (ptext SLIT("import"), ptext SLIT("unsafe"))
+ | otherwise -> (ptext SLIT("import"), empty)
+
+data ForKind
+ = FoLabel
+ | FoExport
+ | FoImport Bool -- True => unsafe call.
+
+data ExtName
+ = Dynamic
+ | ExtName FAST_STRING (Maybe FAST_STRING)
+
+isDynamic :: ExtName -> Bool
+isDynamic Dynamic = True
+isDynamic _ = False
+
+
+instance Outputable ExtName where
+ ppr Dynamic = ptext SLIT("dynamic")
+ ppr (ExtName nm mb_mod) =
+ case mb_mod of { Nothing -> empty; Just m -> doubleQuotes (ptext m) } <+>
+ doubleQuotes (ptext nm)
+
+\end{code}
+
+%************************************************************************
+%* *
+\subsection{Transformation rules}
+%* *
+%************************************************************************
-instance (NamedThing name, Outputable name) => Outputable (IfaceSig name) where
- ppr sty (IfaceSig var ty _ _)
- = ppHang (ppCat [ppr sty (getOccName var), ppPStr SLIT("::")])
- 4 (ppr sty ty)
-
-data HsIdInfo name
- = HsArity ArityInfo
- | HsStrictness (StrictnessInfo name)
- | HsUnfold (UfExpr name)
- | HsUpdate UpdateInfo
- | HsDeforest DeforestInfo
- | HsArgUsage ArgUsageInfo
- | HsFBType FBTypeInfo
- -- ToDo: specialisations
+\begin{code}
+data RuleDecl name pat
+ = RuleDecl
+ FAST_STRING -- Rule name
+ [name] -- Forall'd tyvars, filled in by the renamer with
+ -- tyvars mentioned in sigs; then filled out by typechecker
+ [RuleBndr name] -- Forall'd term vars
+ (HsExpr name pat) -- LHS
+ (HsExpr name pat) -- RHS
+ SrcLoc
+
+ | IfaceRuleDecl -- One that's come in from an interface file
+ name
+ (UfRuleBody name)
+ SrcLoc
+
+data RuleBndr name
+ = RuleBndr name
+ | RuleBndrSig name (HsType name)
+
+instance (Outputable name, Outputable pat)
+ => Outputable (RuleDecl name pat) where
+ ppr (RuleDecl name tvs ns lhs rhs loc)
+ = text "RULE" <+> doubleQuotes (ptext name) <> colon <+>
+ sep [pp_forall, ppr lhs, equals <+> ppr rhs]
+ where
+ pp_forall | null tvs && null ns = empty
+ | otherwise = text "forall" <+>
+ fsep (map ppr tvs ++ map ppr ns)
+ <> dot
+ ppr (IfaceRuleDecl var body loc) = text "An imported rule..."
+
+instance Outputable name => Outputable (RuleBndr name) where
+ ppr (RuleBndr name) = ppr name
+ ppr (RuleBndrSig name ty) = ppr name <> dcolon <> ppr ty
\end{code}
projects / ghc-hetmet.git / blobdiff