type LHsBindsLR idL idR = Bag (LHsBindLR idL idR)
data HsBindLR idL idR
- = FunBind { -- FunBind is used for both functions f x = e
- -- and variables f = \x -> e
--- Reason 1: Special case for type inference: see TcBinds.tcMonoBinds
---
--- Reason 2: instance decls can only have FunBinds, which is convenient
--- If you change this, you'll need to change e.g. rnMethodBinds
-
--- But note that the form f :: a->a = ...
--- parses as a pattern binding, just like
--- (f :: a -> a) = ...
+ = -- | FunBind is used for both functions @f x = e@
+ -- and variables @f = \x -> e@
+ --
+ -- Reason 1: Special case for type inference: see 'TcBinds.tcMonoBinds'.
+ --
+ -- Reason 2: Instance decls can only have FunBinds, which is convenient.
+ -- If you change this, you'll need to change e.g. rnMethodBinds
+ --
+ -- But note that the form @f :: a->a = ...@
+ -- parses as a pattern binding, just like
+ -- @(f :: a -> a) = ... @
+ FunBind {
fun_id :: Located idL,
- fun_infix :: Bool, -- True => infix declaration
+ fun_infix :: Bool, -- ^ True => infix declaration
- fun_matches :: MatchGroup idR, -- The payload
+ fun_matches :: MatchGroup idR, -- ^ The payload
- fun_co_fn :: HsWrapper, -- Coercion from the type of the MatchGroup to the type of
+ fun_co_fn :: HsWrapper, -- ^ Coercion from the type of the MatchGroup to the type of
-- the Id. Example:
+ -- @
-- f :: Int -> forall a. a -> a
-- f x y = y
+ -- @
-- Then the MatchGroup will have type (Int -> a' -> a')
-- (with a free type variable a'). The coercion will take
-- a CoreExpr of this type and convert it to a CoreExpr of
-- type Int -> forall a'. a' -> a'
-- Notice that the coercion captures the free a'.
- bind_fvs :: NameSet, -- After the renamer, this contains a superset of the
+ bind_fvs :: NameSet, -- ^ After the renamer, this contains a superset of the
-- Names of the other binders in this binding group that
-- are free in the RHS of the defn
-- Before renaming, and after typechecking,
-- the field is unused; it's just an error thunk
- fun_tick :: Maybe (Int,[idR]) -- This is the (optional) module-local tick number.
+ fun_tick :: Maybe (Int,[idR]) -- ^ This is the (optional) module-local tick number.
}
| PatBind { -- The pattern is never a simple variable;
ppr_monobind (VarBind { var_id = var, var_rhs = rhs }) = pprBndr CaseBind var <+> equals <+> pprExpr (unLoc rhs)
ppr_monobind (FunBind { fun_id = fun, fun_infix = inf,
fun_matches = matches,
- fun_tick = tick }) =
- (case tick of
- Nothing -> empty
- Just t -> text "-- tick id = " <> ppr t
- ) $$ pprFunBind (unLoc fun) inf matches
+ fun_tick = tick })
+ = pprTicks empty (case tick of
+ Nothing -> empty
+ Just t -> text "-- tick id = " <> ppr t)
+ $$ pprFunBind (unLoc fun) inf matches
ppr_monobind (AbsBinds { abs_tvs = tyvars, abs_dicts = dictvars,
abs_exports = exports, abs_binds = val_binds })
- = sep [ptext (sLit "AbsBinds"),
- brackets (interpp'SP tyvars),
- brackets (interpp'SP dictvars),
- brackets (sep (punctuate comma (map ppr_exp exports)))]
- $$
- nest 2 ( vcat [pprBndr LetBind x | (_,x,_,_) <- exports]
- -- Print type signatures
- $$ pprLHsBinds val_binds )
+ = sep [ptext (sLit "AbsBinds"),
+ brackets (interpp'SP tyvars),
+ brackets (interpp'SP dictvars),
+ brackets (sep (punctuate comma (map ppr_exp exports)))]
+ $$
+ nest 2 ( vcat [pprBndr LetBind x | (_,x,_,_) <- exports]
+ -- Print type signatures
+ $$ pprLHsBinds val_binds )
where
ppr_exp (tvs, gbl, lcl, prags)
= vcat [ppr gbl <+> ptext (sLit "<=") <+> ppr tvs <+> ppr lcl,
nest 2 (vcat (map (pprPrag gbl) prags))]
\end{code}
+
+\begin{code}
+pprTicks :: SDoc -> SDoc -> SDoc
+-- Print stuff about ticks only when -dppr-debug is on, to avoid
+-- them appearing in error messages (from the desugarer); see Trac # 3263
+pprTicks pp_no_debug pp_when_debug
+ = getPprStyle (\ sty -> if debugStyle sty then pp_when_debug
+ else pp_no_debug)
+\end{code}
+
%************************************************************************
%* *
Implicit parameter bindings
data Sig name -- Signatures and pragmas
= -- An ordinary type signature
-- f :: Num a => a -> a
- TypeSig (Located name) -- A bog-std type signature
- (LHsType name)
+ TypeSig (Located name) (LHsType name)
+
+ -- A type signature in generated code, notably the code
+ -- generated for record selectors. We simply record
+ -- the desired Id itself, replete with its name, type
+ -- and IdDetails. Otherwise it's just like a type
+ -- signature: there should be an accompanying binding
+ | IdSig Id
-- An ordinary fixity declaration
-- infixl *** 8
- | FixSig (FixitySig name) -- Fixity declaration
+ | FixSig (FixitySig name)
-- An inline pragma
-- {#- INLINE f #-}
isFixityLSig (L _ (FixSig {})) = True
isFixityLSig _ = False
-isVanillaLSig :: LSig name -> Bool
+isVanillaLSig :: LSig name -> Bool -- User type signatures
+-- A badly-named function, but it's part of the GHCi (used
+-- by Haddock) so I don't want to change it gratuitously.
isVanillaLSig (L _(TypeSig {})) = True
isVanillaLSig _ = False
+isTypeLSig :: LSig name -> Bool -- Type signatures
+isTypeLSig (L _(TypeSig {})) = True
+isTypeLSig (L _(IdSig {})) = True
+isTypeLSig _ = False
+
isSpecLSig :: LSig name -> Bool
isSpecLSig (L _(SpecSig {})) = True
isSpecLSig _ = False
hsSigDoc :: Sig name -> SDoc
hsSigDoc (TypeSig {}) = ptext (sLit "type signature")
+hsSigDoc (IdSig {}) = ptext (sLit "id signature")
hsSigDoc (SpecSig {}) = ptext (sLit "SPECIALISE pragma")
hsSigDoc (InlineSig {}) = ptext (sLit "INLINE pragma")
hsSigDoc (SpecInstSig {}) = ptext (sLit "SPECIALISE instance pragma")
\begin{code}
eqHsSig :: Eq a => LSig a -> LSig a -> Bool
eqHsSig (L _ (FixSig (FixitySig n1 _))) (L _ (FixSig (FixitySig n2 _))) = unLoc n1 == unLoc n2
+eqHsSig (L _ (IdSig n1)) (L _ (IdSig n2)) = n1 == n2
eqHsSig (L _ (TypeSig n1 _)) (L _ (TypeSig n2 _)) = unLoc n1 == unLoc n2
eqHsSig (L _ (InlineSig n1 _)) (L _ (InlineSig n2 _)) = unLoc n1 == unLoc n2
-- For specialisations, we don't have equality over
ppr_sig :: OutputableBndr name => Sig name -> SDoc
ppr_sig (TypeSig var ty) = pprVarSig (unLoc var) ty
+ppr_sig (IdSig id) = pprVarSig id (varType id)
ppr_sig (FixSig fix_sig) = ppr fix_sig
ppr_sig (SpecSig var ty inl) = pragBrackets (pprSpec var ty inl)
ppr_sig (InlineSig var inl) = pragBrackets (ppr inl <+> ppr var)
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