%
-% (c) The GRASP/AQUA Project, Glasgow University, 1992-1996
+% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[HsBinds]{Abstract syntax: top-level bindings and signatures}
Datatype for: @HsBinds@, @Bind@, @Sig@, @MonoBinds@.
\begin{code}
-#include "HsVersions.h"
-
module HsBinds where
-IMP_Ubiq()
+#include "HsVersions.h"
+
+import {-# SOURCE #-} HsExpr ( HsExpr, pprExpr,
+ Match, pprFunBind,
+ GRHSs, pprPatBind )
-- friends:
-IMPORT_DELOOPER(HsLoop)
-import HsMatches ( pprMatches, pprGRHSsAndBinds,
- Match, GRHSsAndBinds )
-import HsPat ( collectPatBinders, InPat )
-import HsPragmas ( GenPragmas, ClassOpPragmas )
+import HsImpExp ( pprHsVar )
+import HsPat ( Pat )
import HsTypes ( HsType )
-import CoreSyn ( SYN_IE(CoreExpr) )
+import CoreSyn ( CoreExpr )
+import PprCore ( {- instance Outputable (Expr a) -} )
--others:
-import Id ( SYN_IE(DictVar), SYN_IE(Id), GenId )
-import Name ( pprNonSym, getOccName, OccName )
-import Outputable ( interpp'SP, ifnotPprForUser,
- Outputable(..){-instance * (,)-}
- )
-import PprCore ( GenCoreExpr {- instance Outputable -} )
-import PprType ( GenTyVar {- instance Outputable -} )
-import Pretty
-import Bag
-import SrcLoc ( SrcLoc{-instances-} )
-import TyVar ( GenTyVar{-instances-} )
-import Unique ( Unique {- instance Eq -} )
+import Name ( Name )
+import PrelNames ( isUnboundName )
+import NameSet ( NameSet, elemNameSet, nameSetToList )
+import BasicTypes ( RecFlag(..), FixitySig(..), Activation(..) )
+import Outputable
+import SrcLoc ( SrcLoc )
+import Var ( TyVar )
+import Class ( DefMeth (..) )
\end{code}
%************************************************************************
Collections of bindings, created by dependency analysis and translation:
\begin{code}
-data HsBinds tyvar uvar id pat -- binders and bindees
+data HsBinds id -- binders and bindees
= EmptyBinds
- | ThenBinds (HsBinds tyvar uvar id pat)
- (HsBinds tyvar uvar id pat)
-
- | SingleBind (Bind tyvar uvar id pat)
-
- | BindWith -- Bind with a type signature.
- -- These appear only on typechecker input
- -- (HsType [in Sigs] can't appear on output)
- (Bind tyvar uvar id pat)
- [Sig id]
+ | ThenBinds (HsBinds id)
+ (HsBinds id)
- | AbsBinds -- Binds abstraction; TRANSLATION
- [tyvar]
- [id] -- Dicts
- [(id, id)] -- (old, new) pairs
- [(id, HsExpr tyvar uvar id pat)] -- local dictionaries
- (Bind tyvar uvar id pat) -- "the business end"
-
- -- Creates bindings for *new* (polymorphic, overloaded) locals
- -- in terms of *old* (monomorphic, non-overloaded) ones.
- --
- -- See section 9 of static semantics paper for more details.
- -- (You can get a PhD for explaining the True Meaning
- -- of this last construct.)
+ | MonoBind (MonoBinds id)
+ [Sig id] -- Empty on typechecker output, Type Signatures
+ RecFlag
\end{code}
\begin{code}
-nullBinds :: HsBinds tyvar uvar id pat -> Bool
+nullBinds :: HsBinds id -> Bool
nullBinds EmptyBinds = True
nullBinds (ThenBinds b1 b2) = nullBinds b1 && nullBinds b2
-nullBinds (SingleBind b) = nullBind b
-nullBinds (BindWith b _) = nullBind b
-nullBinds (AbsBinds _ _ _ ds b) = null ds && nullBind b
+nullBinds (MonoBind b _ _) = nullMonoBinds b
+
+mkMonoBind :: MonoBinds id -> [Sig id] -> RecFlag -> HsBinds id
+mkMonoBind EmptyMonoBinds _ _ = EmptyBinds
+mkMonoBind mbinds sigs is_rec = MonoBind mbinds sigs is_rec
\end{code}
\begin{code}
-instance (Outputable pat, NamedThing id, Outputable id,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
- Outputable (HsBinds tyvar uvar id pat) where
-
- ppr sty EmptyBinds = ppNil
- ppr sty (ThenBinds binds1 binds2)
- = ppAbove (ppr sty binds1) (ppr sty binds2)
- ppr sty (SingleBind bind) = ppr sty bind
- ppr sty (BindWith bind sigs)
- = ppAbove (if null sigs
- then ppNil
- else ppAboves (map (ppr sty) sigs))
- (ppr sty bind)
- ppr sty (AbsBinds tyvars dictvars local_pairs dict_binds val_binds)
- = ppAbove (ppSep [ppPStr SLIT("AbsBinds"),
- ppBesides[ppLbrack, interpp'SP sty tyvars, ppRbrack],
- ppBesides[ppLbrack, interpp'SP sty dictvars, ppRbrack],
- ppBesides[ppLbrack, interpp'SP sty local_pairs, ppRbrack]])
- (ppNest 4 (ppAbove (ppAboves (map (ppr sty) dict_binds)) (ppr sty val_binds)))
+instance (OutputableBndr id) => Outputable (HsBinds id) where
+ ppr binds = ppr_binds binds
+
+ppr_binds EmptyBinds = empty
+ppr_binds (ThenBinds binds1 binds2)
+ = ppr_binds binds1 $$ ppr_binds binds2
+ppr_binds (MonoBind bind sigs is_rec)
+ = vcat [ppr_isrec,
+ vcat (map ppr sigs),
+ ppr bind
+ ]
+ where
+ ppr_isrec = getPprStyle $ \ sty ->
+ if userStyle sty then empty else
+ case is_rec of
+ Recursive -> ptext SLIT("{- rec -}")
+ NonRecursive -> ptext SLIT("{- nonrec -}")
\end{code}
%************************************************************************
%* *
-\subsection{@Sig@: type signatures and value-modifying user pragmas}
+\subsection{Bindings: @MonoBinds@}
%* *
%************************************************************************
-It is convenient to lump ``value-modifying'' user-pragmas (e.g.,
-``specialise this function to these four types...'') in with type
-signatures. Then all the machinery to move them into place, etc.,
-serves for both.
+Global bindings (where clauses)
\begin{code}
-data Sig name
- = Sig name -- a bog-std type signature
- (HsType name)
- SrcLoc
+data MonoBinds id
+ = EmptyMonoBinds
- | ClassOpSig name -- class-op sigs have different pragmas
- (HsType name)
- (ClassOpPragmas name) -- only interface ones have pragmas
- SrcLoc
+ | AndMonoBinds (MonoBinds id)
+ (MonoBinds id)
+
+ | FunMonoBind id -- Used for both functions f x = e
+ -- and variables f = \x -> e
+ -- Reason: the Match stuff lets us have an optional
+ -- result type sig f :: a->a = ...mentions a...
+ --
+ -- This also means that instance decls can only have
+ -- FunMonoBinds, so if you change this, you'll need to
+ -- change e.g. rnMethodBinds
+ Bool -- True => infix declaration
+ [Match id]
+ SrcLoc
- | SpecSig name -- specialise a function or datatype ...
- (HsType name) -- ... to these types
- (Maybe name) -- ... maybe using this as the code for it
- SrcLoc
+ | PatMonoBind (Pat id) -- The pattern is never a simple variable;
+ -- That case is done by FunMonoBind
+ (GRHSs id)
+ SrcLoc
- | InlineSig name -- INLINE f
- SrcLoc
+ | VarMonoBind id -- TRANSLATION
+ (HsExpr id)
- | DeforestSig name -- Deforest using this function definition
- SrcLoc
+ | AbsBinds -- Binds abstraction; TRANSLATION
+ [TyVar] -- Type variables
+ [id] -- Dicts
+ [([TyVar], id, id)] -- (type variables, polymorphic, momonmorphic) triples
+ NameSet -- Set of *polymorphic* variables that have an INLINE pragma
+ (MonoBinds id) -- The "business end"
- | MagicUnfoldingSig
- name -- Associate the "name"d function with
- FAST_STRING -- the compiler-builtin unfolding (known
- SrcLoc -- by the String name)
+ -- Creates bindings for *new* (polymorphic, overloaded) locals
+ -- in terms of *old* (monomorphic, non-overloaded) ones.
+ --
+ -- See section 9 of static semantics paper for more details.
+ -- (You can get a PhD for explaining the True Meaning
+ -- of this last construct.)
\end{code}
-\begin{code}
-instance (NamedThing name, Outputable name) => Outputable (Sig name) where
- ppr sty (Sig var ty _)
- = ppHang (ppCat [ppr sty var, ppPStr SLIT("::")])
- 4 (ppr sty ty)
-
- ppr sty (ClassOpSig var ty pragmas _)
- = ppHang (ppCat [ppr sty (getOccName var), ppPStr SLIT("::")])
- 4 (ppHang (ppr sty ty)
- 4 (ifnotPprForUser sty (ppr sty pragmas)))
-
- ppr sty (DeforestSig var _)
- = ppHang (ppCat [ppStr "{-# DEFOREST", pprNonSym sty var])
- 4 (ppStr "#-}")
-
- ppr sty (SpecSig var ty using _)
- = ppHang (ppCat [ppPStr SLIT("{-# SPECIALIZE"), pprNonSym sty var, ppPStr SLIT("::")])
- 4 (ppCat [ppr sty ty, pp_using using, ppPStr SLIT("#-}")])
- where
- pp_using Nothing = ppNil
- pp_using (Just me) = ppCat [ppChar '=', ppr sty me]
+What AbsBinds means
+~~~~~~~~~~~~~~~~~~~
+ AbsBinds tvs
+ [d1,d2]
+ [(tvs1, f1p, f1m),
+ (tvs2, f2p, f2m)]
+ BIND
+means
- ppr sty (InlineSig var _)
- = ppCat [ppPStr SLIT("{-# INLINE"), pprNonSym sty var, ppPStr SLIT("#-}")]
+ f1p = /\ tvs -> \ [d1,d2] -> letrec DBINDS and BIND
+ in fm
- ppr sty (MagicUnfoldingSig var str _)
- = ppCat [ppPStr SLIT("{-# MAGIC_UNFOLDING"), pprNonSym sty var, ppPStr str, ppPStr SLIT("#-}")]
-\end{code}
+ gp = ...same again, with gm instead of fm
-%************************************************************************
-%* *
-\subsection{Binding: @Bind@}
-%* *
-%************************************************************************
+This is a pretty bad translation, because it duplicates all the bindings.
+So the desugarer tries to do a better job:
-\begin{code}
-data Bind tyvar uvar id pat -- binders and bindees
- = EmptyBind -- because it's convenient when parsing signatures
- | NonRecBind (MonoBinds tyvar uvar id pat)
- | RecBind (MonoBinds tyvar uvar id pat)
-\end{code}
+ fp = /\ [a,b] -> \ [d1,d2] -> case tp [a,b] [d1,d2] of
+ (fm,gm) -> fm
+ ..ditto for gp..
+
+ tp = /\ [a,b] -> \ [d1,d2] -> letrec DBINDS and BIND
+ in (fm,gm)
\begin{code}
-nullBind :: Bind tyvar uvar id pat -> Bool
+-- We keep the invariant that a MonoBinds is only empty
+-- if it is exactly EmptyMonoBinds
+
+nullMonoBinds :: MonoBinds id -> Bool
+nullMonoBinds EmptyMonoBinds = True
+nullMonoBinds other_monobind = False
-nullBind EmptyBind = True
-nullBind (NonRecBind bs) = nullMonoBinds bs
-nullBind (RecBind bs) = nullMonoBinds bs
+andMonoBinds :: MonoBinds id -> MonoBinds id -> MonoBinds id
+andMonoBinds EmptyMonoBinds mb = mb
+andMonoBinds mb EmptyMonoBinds = mb
+andMonoBinds mb1 mb2 = AndMonoBinds mb1 mb2
+
+andMonoBindList :: [MonoBinds id] -> MonoBinds id
+andMonoBindList binds
+ = loop1 binds
+ where
+ loop1 [] = EmptyMonoBinds
+ loop1 (EmptyMonoBinds : binds) = loop1 binds
+ loop1 (b:bs) = loop2 b bs
+
+ -- acc is non-empty
+ loop2 acc [] = acc
+ loop2 acc (EmptyMonoBinds : bs) = loop2 acc bs
+ loop2 acc (b:bs) = loop2 (acc `AndMonoBinds` b) bs
\end{code}
+
\begin{code}
-bindIsRecursive :: Bind tyvar uvar id pat -> Bool
+instance OutputableBndr id => Outputable (MonoBinds id) where
+ ppr mbind = ppr_monobind mbind
-bindIsRecursive EmptyBind = False
-bindIsRecursive (NonRecBind _) = False
-bindIsRecursive (RecBind _) = True
-\end{code}
-\begin{code}
-instance (NamedThing id, Outputable id, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
- Outputable (Bind tyvar uvar id pat) where
- ppr sty EmptyBind = ppNil
- ppr sty (NonRecBind binds)
- = ppAbove (ifnotPprForUser sty (ppStr "{- nonrec -}"))
- (ppr sty binds)
- ppr sty (RecBind binds)
- = ppAbove (ifnotPprForUser sty (ppStr "{- rec -}"))
- (ppr sty binds)
+ppr_monobind :: OutputableBndr id => MonoBinds id -> SDoc
+ppr_monobind EmptyMonoBinds = empty
+ppr_monobind (AndMonoBinds binds1 binds2)
+ = ppr_monobind binds1 $$ ppr_monobind binds2
+
+ppr_monobind (PatMonoBind pat grhss locn) = pprPatBind pat grhss
+ppr_monobind (FunMonoBind fun inf matches locn) = pprFunBind fun matches
+ -- ToDo: print infix if appropriate
+
+ppr_monobind (VarMonoBind name expr)
+ = sep [pprBndr LetBind name <+> equals, nest 4 (pprExpr expr)]
+
+ppr_monobind (AbsBinds tyvars dictvars exports inlines val_binds)
+ = sep [ptext SLIT("AbsBinds"),
+ brackets (interpp'SP tyvars),
+ brackets (interpp'SP dictvars),
+ brackets (sep (punctuate comma (map ppr exports))),
+ brackets (interpp'SP (nameSetToList inlines))]
+ $$
+ nest 4 ( vcat [pprBndr LetBind x | (_,x,_) <- exports]
+ -- Print type signatures
+ $$
+ ppr val_binds )
\end{code}
%************************************************************************
%* *
-\subsection{Bindings: @MonoBinds@}
+\subsection{@Sig@: type signatures and value-modifying user pragmas}
%* *
%************************************************************************
-Global bindings (where clauses)
+It is convenient to lump ``value-modifying'' user-pragmas (e.g.,
+``specialise this function to these four types...'') in with type
+signatures. Then all the machinery to move them into place, etc.,
+serves for both.
\begin{code}
-data MonoBinds tyvar uvar id pat
- = EmptyMonoBinds
- | AndMonoBinds (MonoBinds tyvar uvar id pat)
- (MonoBinds tyvar uvar id pat)
- | PatMonoBind pat
- (GRHSsAndBinds tyvar uvar id pat)
- SrcLoc
- | FunMonoBind id
- Bool -- True => infix declaration
- [Match tyvar uvar id pat] -- must have at least one Match
- SrcLoc
+data Sig name
+ = Sig name -- a bog-std type signature
+ (HsType name)
+ SrcLoc
- | VarMonoBind id -- TRANSLATION
- (HsExpr tyvar uvar id pat)
+ | ClassOpSig name -- Selector name
+ (DefMeth name) -- Default-method info
+ -- See "THE NAMING STORY" in HsDecls
+ (HsType name)
+ SrcLoc
+
+ | SpecSig name -- specialise a function or datatype ...
+ (HsType name) -- ... to these types
+ SrcLoc
+
+ | InlineSig Bool -- True <=> INLINE f, False <=> NOINLINE f
+ name -- Function name
+ Activation -- When inlining is *active*
+ SrcLoc
- | CoreMonoBind id -- TRANSLATION
- CoreExpr -- No zonking; this is a final CoreExpr with Ids and Types!
+ | SpecInstSig (HsType name) -- (Class tys); should be a specialisation of the
+ -- current instance decl
+ SrcLoc
+
+ | FixSig (FixitySig name) -- Fixity declaration
\end{code}
\begin{code}
-nullMonoBinds :: MonoBinds tyvar uvar id pat -> Bool
+okBindSig :: NameSet -> Sig Name -> Bool
+okBindSig ns (ClassOpSig _ _ _ _) = False
+okBindSig ns sig = sigForThisGroup ns sig
+
+okClsDclSig :: NameSet -> Sig Name -> Bool
+okClsDclSig ns (Sig _ _ _) = False
+okClsDclSig ns sig = sigForThisGroup ns sig
+
+okInstDclSig :: NameSet -> Sig Name -> Bool
+okInstDclSig ns (Sig _ _ _) = False
+okInstDclSig ns (FixSig _) = False
+okInstDclSig ns (SpecInstSig _ _) = True
+okInstDclSig ns sig = sigForThisGroup ns sig
+
+sigForThisGroup ns sig
+ = case sigName sig of
+ Nothing -> False
+ Just n | isUnboundName n -> True -- Don't complain about an unbound name again
+ | otherwise -> n `elemNameSet` ns
+
+sigName :: Sig name -> Maybe name
+sigName (Sig n _ _) = Just n
+sigName (ClassOpSig n _ _ _) = Just n
+sigName (SpecSig n _ _) = Just n
+sigName (InlineSig _ n _ _) = Just n
+sigName (FixSig (FixitySig n _ _)) = Just n
+sigName other = Nothing
+
+isFixitySig :: Sig name -> Bool
+isFixitySig (FixSig _) = True
+isFixitySig _ = False
+
+isClassOpSig :: Sig name -> Bool
+isClassOpSig (ClassOpSig _ _ _ _) = True
+isClassOpSig _ = False
+
+isPragSig :: Sig name -> Bool
+ -- Identifies pragmas
+isPragSig (SpecSig _ _ _) = True
+isPragSig (InlineSig _ _ _ _) = True
+isPragSig (SpecInstSig _ _) = True
+isPragSig other = False
+\end{code}
-nullMonoBinds EmptyMonoBinds = True
-nullMonoBinds (AndMonoBinds bs1 bs2) = nullMonoBinds bs1 && nullMonoBinds bs2
-nullMonoBinds other_monobind = False
+\begin{code}
+hsSigDoc (Sig _ _ loc) = (ptext SLIT("type signature"),loc)
+hsSigDoc (ClassOpSig _ _ _ loc) = (ptext SLIT("class-method type signature"), loc)
+hsSigDoc (SpecSig _ _ loc) = (ptext SLIT("SPECIALISE pragma"),loc)
+hsSigDoc (InlineSig True _ _ loc) = (ptext SLIT("INLINE pragma"),loc)
+hsSigDoc (InlineSig False _ _ loc) = (ptext SLIT("NOINLINE pragma"),loc)
+hsSigDoc (SpecInstSig _ loc) = (ptext SLIT("SPECIALISE instance pragma"),loc)
+hsSigDoc (FixSig (FixitySig _ _ loc)) = (ptext SLIT("fixity declaration"), loc)
\end{code}
\begin{code}
-instance (NamedThing id, Outputable id, Outputable pat,
- Eq tyvar, Outputable tyvar, Eq uvar, Outputable uvar) =>
- Outputable (MonoBinds tyvar uvar id pat) where
- ppr sty EmptyMonoBinds = ppNil
- ppr sty (AndMonoBinds binds1 binds2)
- = ppAbove (ppr sty binds1) (ppr sty binds2)
-
- ppr sty (PatMonoBind pat grhss_n_binds locn)
- = ppHang (ppr sty pat) 4 (pprGRHSsAndBinds sty False grhss_n_binds)
-
- ppr sty (FunMonoBind fun inf matches locn)
- = pprMatches sty (False, ppr sty fun) matches
- -- ToDo: print infix if appropriate
+instance (Outputable name) => Outputable (Sig name) where
+ ppr sig = ppr_sig sig
- ppr sty (VarMonoBind name expr)
- = ppHang (ppCat [ppr sty name, ppEquals]) 4 (ppr sty expr)
+ppr_sig :: Outputable name => Sig name -> SDoc
+ppr_sig (Sig var ty _)
+ = sep [ppr var <+> dcolon, nest 4 (ppr ty)]
- ppr sty (CoreMonoBind name expr)
- = ppHang (ppCat [ppr sty name, ppEquals]) 4 (ppr sty expr)
+ppr_sig (ClassOpSig var dm ty _)
+ = sep [ pprHsVar var <+> dcolon,
+ nest 4 (ppr ty),
+ nest 4 (pp_dm_comment) ]
+ where
+ pp_dm = case dm of
+ DefMeth _ -> equals -- Default method indicator
+ GenDefMeth -> semi -- Generic method indicator
+ NoDefMeth -> empty -- No Method at all
+ pp_dm_comment = case dm of
+ DefMeth _ -> text "{- has default method -}"
+ GenDefMeth -> text "{- has generic method -}"
+ NoDefMeth -> empty -- No Method at all
+
+ppr_sig (SpecSig var ty _)
+ = sep [ hsep [text "{-# SPECIALIZE", ppr var, dcolon],
+ nest 4 (ppr ty <+> text "#-}")
+ ]
+
+ppr_sig (InlineSig True var phase _)
+ = hsep [text "{-# INLINE", ppr phase, ppr var, text "#-}"]
+
+ppr_sig (InlineSig False var phase _)
+ = hsep [text "{-# NOINLINE", ppr phase, ppr var, text "#-}"]
+
+ppr_sig (SpecInstSig ty _)
+ = hsep [text "{-# SPECIALIZE instance", ppr ty, text "#-}"]
+
+ppr_sig (FixSig fix_sig) = ppr fix_sig
\end{code}
-%************************************************************************
-%* *
-\subsection{Collecting binders from @HsBinds@}
-%* *
-%************************************************************************
+Checking for distinct signatures; oh, so boring
-Get all the binders in some @MonoBinds@, IN THE ORDER OF
-APPEARANCE; e.g., in:
-\begin{verbatim}
-...
-where
- (x, y) = ...
- f i j = ...
- [a, b] = ...
-\end{verbatim}
-it should return @[x, y, f, a, b]@ (remember, order important).
\begin{code}
-collectTopBinders :: HsBinds tyvar uvar name (InPat name) -> Bag (name,SrcLoc)
-collectTopBinders EmptyBinds = emptyBag
-collectTopBinders (SingleBind b) = collectBinders b
-collectTopBinders (BindWith b _) = collectBinders b
-collectTopBinders (ThenBinds b1 b2)
- = collectTopBinders b1 `unionBags` collectTopBinders b2
-
-collectBinders :: Bind tyvar uvar name (InPat name) -> Bag (name,SrcLoc)
-collectBinders EmptyBind = emptyBag
-collectBinders (NonRecBind monobinds) = collectMonoBinders monobinds
-collectBinders (RecBind monobinds) = collectMonoBinders monobinds
-
-collectMonoBinders :: MonoBinds tyvar uvar name (InPat name) -> Bag (name,SrcLoc)
-collectMonoBinders EmptyMonoBinds = emptyBag
-collectMonoBinders (PatMonoBind pat grhss_w_binds loc) = listToBag (map (\v->(v,loc)) (collectPatBinders pat))
-collectMonoBinders (FunMonoBind f _ matches loc) = unitBag (f,loc)
-collectMonoBinders (VarMonoBind v expr) = error "collectMonoBinders"
-collectMonoBinders (CoreMonoBind v expr) = error "collectMonoBinders"
-collectMonoBinders (AndMonoBinds bs1 bs2)
- = collectMonoBinders bs1 `unionBags` collectMonoBinders bs2
+eqHsSig :: Sig Name -> Sig Name -> Bool
+eqHsSig (Sig n1 _ _) (Sig n2 _ _) = n1 == n2
+eqHsSig (InlineSig b1 n1 _ _)(InlineSig b2 n2 _ _) = b1 == b2 && n1 == n2
+
+eqHsSig (SpecInstSig ty1 _) (SpecInstSig ty2 _) = ty1 == ty2
+eqHsSig (SpecSig n1 ty1 _) (SpecSig n2 ty2 _) =
+ -- may have many specialisations for one value;
+ -- but not ones that are exactly the same...
+ (n1 == n2) && (ty1 == ty2)
+
+eqHsSig _other1 _other2 = False
\end{code}