\section[TcBinds]{TcBinds}
\begin{code}
-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
module TcBinds ( tcLocalBinds, tcTopBinds,
tcHsBootSigs, tcMonoBinds,
TcPragFun, tcSpecPrag, tcPrags, mkPragFun,
import DynFlags
import HsSyn
-import TcHsSyn
import TcRnMonad
import Inst
import TysPrim
import Id
import IdInfo
-import Var ( TyVar, varType )
+import Var hiding (mkLocalId)
import Name
import NameSet
import NameEnv
= do { sigma_ty <- tcHsSigType (FunSigCtxt name) ty
; return (mkVanillaGlobal name sigma_ty vanillaIdInfo) }
-- Notice that we make GlobalIds, not LocalIds
+ tc_boot_sig s = pprPanic "tcHsBootSigs/tc_boot_sig" (ppr s)
tcHsBootSigs groups = pprPanic "tcHsBootSigs" (ppr groups)
badBootDeclErr :: Message
-> HsValBinds Name -> TcM thing
-> TcM (HsValBinds TcId, thing)
-tcValBinds top_lvl (ValBindsIn binds sigs) thing_inside
+tcValBinds _ (ValBindsIn binds _) _
= pprPanic "tcValBinds" (ppr binds)
tcValBinds top_lvl (ValBindsOut binds sigs) thing_inside
-- Typecheck a whole lot of value bindings,
-- one strongly-connected component at a time
-tc_val_binds poly_rec top_lvl sig_fn prag_fn [] thing_inside
+tc_val_binds _ _ _ _ [] thing_inside
= do { thing <- thing_inside
; return ([], thing) }
-- We get a list of groups back, because there may
-- be specialisations etc as well
-tc_group poly_rec top_lvl sig_fn prag_fn (NonRecursive, binds) thing_inside
+tc_group _ top_lvl sig_fn prag_fn (NonRecursive, binds) thing_inside
-- A single non-recursive binding
-- We want to keep non-recursive things non-recursive
-- so that we desugar unlifted bindings correctly
tc_sub_group = tcPolyBinds top_lvl sig_fn prag_fn Recursive
+tc_haskell98 :: TopLevelFlag -> TcSigFun -> TcPragFun -> RecFlag
+ -> LHsBinds Name -> TcM a -> TcM ([LHsBinds TcId], a)
tc_haskell98 top_lvl sig_fn prag_fn rec_flag binds thing_inside
= bindLocalInsts top_lvl $ do
{ (binds1, ids) <- tcPolyBinds top_lvl sig_fn prag_fn rec_flag rec_flag binds
------------------------
bindLocalInsts :: TopLevelFlag -> TcM ([LHsBinds TcId], [TcId], a) -> TcM ([LHsBinds TcId], a)
bindLocalInsts top_lvl thing_inside
- | isTopLevel top_lvl = do { (binds, ids, thing) <- thing_inside; return (binds, thing) }
+ | isTopLevel top_lvl = do { (binds, _, thing) <- thing_inside; return (binds, thing) }
-- For the top level don't bother with all this bindInstsOfLocalFuns stuff.
-- All the top level things are rec'd together anyway, so it's fine to
-- leave them to the tcSimplifyTop, and quite a bit faster too
bindersOfHsBind :: HsBind Name -> [Name]
bindersOfHsBind (PatBind { pat_lhs = pat }) = collectPatBinders pat
bindersOfHsBind (FunBind { fun_id = L _ f }) = [f]
+bindersOfHsBind (AbsBinds {}) = panic "bindersOfHsBind AbsBinds"
+bindersOfHsBind (VarBind {}) = panic "bindersOfHsBind VarBind"
------------------------
tcPolyBinds :: TopLevelFlag -> TcSigFun -> TcPragFun
do { extendLIEs lie_req
; let exports = zipWith mk_export mono_bind_infos zonked_mono_tys
mk_export (name, Nothing, mono_id) mono_ty = ([], mkLocalId name mono_ty, mono_id, [])
- mk_export (name, Just sig, mono_id) mono_ty = ([], sig_id sig, mono_id, [])
+ mk_export (_, Just sig, mono_id) _ = ([], sig_id sig, mono_id, [])
-- ToDo: prags for unlifted bindings
; return ( [unitBag $ L loc $ AbsBinds [] [] exports binds'],
mk_poly_id warn Nothing = do { poly_ty' <- zonkTcType poly_ty
; missingSigWarn warn poly_name poly_ty'
; return (inferred_tvs, mkLocalId poly_name poly_ty') }
- mk_poly_id warn (Just sig) = do { tvs <- mapM zonk_tv (sig_tvs sig)
+ mk_poly_id _ (Just sig) = do { tvs <- mapM zonk_tv (sig_tvs sig)
; return (tvs, sig_id sig) }
zonk_tv tv = do { ty <- zonkTcTyVar tv; return (tcGetTyVar "mkExport" ty) }
tc_prag prag = addErrCtxt (pragSigCtxt prag) $
tcPrag poly_id prag
+pragSigCtxt :: Sig Name -> SDoc
pragSigCtxt prag = hang (ptext (sLit "In the pragma")) 2 (ppr prag)
tcPrag :: TcId -> Sig Name -> TcM Prag
-- Pre-condition: the poly_id is zonked
-- Reason: required by tcSubExp
-tcPrag poly_id (SpecSig orig_name hs_ty inl) = tcSpecPrag poly_id hs_ty inl
-tcPrag poly_id (SpecInstSig hs_ty) = tcSpecPrag poly_id hs_ty defaultInlineSpec
-tcPrag poly_id (InlineSig v inl) = return (InlinePrag inl)
+tcPrag poly_id (SpecSig _ hs_ty inl) = tcSpecPrag poly_id hs_ty inl
+tcPrag poly_id (SpecInstSig hs_ty) = tcSpecPrag poly_id hs_ty defaultInlineSpec
+tcPrag _ (InlineSig _ inl) = return (InlinePrag inl)
+tcPrag _ (FixSig {}) = panic "tcPrag FixSig"
+tcPrag _ (TypeSig {}) = panic "tcPrag TypeSig"
tcSpecPrag :: TcId -> LHsType Name -> InlineSpec -> TcM Prag
-- If typechecking the binds fails, then return with each
-- signature-less binder given type (forall a.a), to minimise
-- subsequent error messages
+recoveryCode :: [Name] -> (Name -> Maybe [Name])
+ -> TcM ([Bag (LHsBindLR Id Var)], [Id])
recoveryCode binder_names sig_fn
= do { traceTc (text "tcBindsWithSigs: error recovery" <+> ppr binder_names)
; poly_ids <- mapM mk_dummy binder_names
bang_pat = anyBag (isBangHsBind . unLoc) mbind
check_sig (_, Just sig, _) = checkTc (null (sig_tvs sig) && null (sig_theta sig))
(badStrictSig unlifted sig)
- check_sig other = return ()
+ check_sig _ = return ()
+strictBindErr :: String -> Bool -> LHsBindsLR Var Var -> SDoc
strictBindErr flavour unlifted mbind
= hang (text flavour <+> msg <+> ptext (sLit "aren't allowed:"))
4 (pprLHsBinds mbind)
msg | unlifted = ptext (sLit "bindings for unlifted types")
| otherwise = ptext (sLit "bang-pattern bindings")
+badStrictSig :: Bool -> TcSigInfo -> SDoc
badStrictSig unlifted sig
= hang (ptext (sLit "Illegal polymorphic signature in") <+> msg)
4 (ppr sig)
[(name, Nothing, mono_id)]) }
tcMonoBinds [L b_loc (FunBind { fun_id = L nm_loc name, fun_infix = inf,
- fun_matches = matches, bind_fvs = fvs })]
+ fun_matches = matches })]
sig_fn -- Single function binding
- non_rec
+ _
| Just scoped_tvs <- sig_fn name -- ...with a type signature
= -- When we have a single function binding, with a type signature
-- we can (a) use genuine, rigid skolem constants for the type variables
; return (unitBag (L b_loc fun_bind'),
[(name, Just tc_sig, mono_id)]) }
-tcMonoBinds binds sig_fn non_rec
+tcMonoBinds binds sig_fn _
= do { tc_binds <- mapM (wrapLocM (tcLhs sig_fn)) binds
-- Bring the monomorphic Ids, into scope for the RHSs
mk_mono_ty (Just sig) = return (sig_tau sig)
mk_mono_ty Nothing = newFlexiTyVarTy argTypeKind
-tcLhs sig_fn bind@(PatBind { pat_lhs = pat, pat_rhs = grhss })
+tcLhs sig_fn (PatBind { pat_lhs = pat, pat_rhs = grhss })
= do { mb_sigs <- mapM (tcInstSig_maybe sig_fn) names
; mono_pat_binds <- doptM Opt_MonoPatBinds
-- With -fmono-pat-binds, we do no generalisation of pattern bindings
names = collectPatBinders pat
-tcLhs sig_fn other_bind = pprPanic "tcLhs" (ppr other_bind)
+tcLhs _ other_bind = pprPanic "tcLhs" (ppr other_bind)
-- AbsBind, VarBind impossible
-------------------
bind_fvs = placeHolderNames, fun_co_fn = co_fn,
fun_tick = Nothing }) }
-tcRhs bind@(TcPatBind _ pat' grhss pat_ty)
+tcRhs (TcPatBind _ pat' grhss pat_ty)
= do { grhss' <- addErrCtxt (patMonoBindsCtxt pat' grhss) $
tcGRHSsPat grhss pat_ty
; return (PatBind { pat_lhs = pat', pat_rhs = grhss', pat_rhs_ty = pat_ty,
\begin{code}
unifyCtxts :: [TcSigInfo] -> TcM [Inst]
-- Post-condition: the returned Insts are full zonked
+unifyCtxts [] = panic "unifyCtxts []"
unifyCtxts (sig1 : sigs) -- Argument is always non-empty
= do { mapM unify_ctxt sigs
; theta <- zonkTcThetaType (sig_theta sig1)
mkTcSigFun sigs = lookupNameEnv env
where
env = mkNameEnv [(name, hsExplicitTvs lhs_ty)
- | L span (TypeSig (L _ name) lhs_ty) <- sigs]
+ | L _ (TypeSig (L _ name) lhs_ty) <- sigs]
-- The scoped names are the ones explicitly mentioned
-- in the HsForAll. (There may be more in sigma_ty, because
-- of nested type synonyms. See Note [More instantiated than scoped].)
= setSrcSpan span $
do { sigma_ty <- tcHsSigType (FunSigCtxt name) ty
; return (mkLocalId name sigma_ty) }
+tcTySig s = pprPanic "tcTySig" (ppr s)
-------------------
tcInstSig_maybe :: TcSigFun -> Name -> TcM (Maybe TcSigInfo)
-- this signature is part of a multi-signature group
tcInstSig_maybe sig_fn name
= case sig_fn name of
- Nothing -> return Nothing
- Just scoped_tvs -> do { tc_sig <- tcInstSig False name
- ; return (Just tc_sig) }
- -- NB: the scoped_tvs may be non-empty, but we can
+ Nothing -> return Nothing
+ Just _scoped_tvs -> do { tc_sig <- tcInstSig False name
+ ; return (Just tc_sig) }
+ -- NB: the _scoped_tvs may be non-empty, but we can
-- just ignore them. See Note [Scoped tyvars].
tcInstSig :: Bool -> Name -> TcM TcSigInfo
= dopt Opt_MonoPatBinds dflags && any is_pat_bind binds
where
is_pat_bind (L _ (PatBind {})) = True
- is_pat_bind other = False
+ is_pat_bind _ = False
-------------------
isRestrictedGroup :: DynFlags -> [LHsBind Name] -> TcSigFun -> Bool
unrestricted (VarBind { var_id = v }) = has_sig v
unrestricted (FunBind { fun_id = v, fun_matches = matches }) = unrestricted_match matches
|| has_sig (unLoc v)
+ unrestricted (AbsBinds {})
+ = panic "isRestrictedGroup/unrestricted AbsBinds"
unrestricted_match (MatchGroup (L _ (Match [] _ _) : _) _) = False
-- No args => like a pattern binding
- unrestricted_match other = True
+ unrestricted_match _ = True
-- Some args => a function binding
\end{code}
\begin{code}
-- This one is called on LHS, when pat and grhss are both Name
-- and on RHS, when pat is TcId and grhss is still Name
+patMonoBindsCtxt :: OutputableBndr id => LPat id -> GRHSs Name -> SDoc
patMonoBindsCtxt pat grhss
= hang (ptext (sLit "In a pattern binding:")) 4 (pprPatBind pat grhss)
-----------------------------------------------
+sigContextsCtxt :: TcSigInfo -> TcSigInfo -> SDoc
sigContextsCtxt sig1 sig2
= vcat [ptext (sLit "When matching the contexts of the signatures for"),
nest 2 (vcat [ppr id1 <+> dcolon <+> ppr (idType id1),
-----------------------------------------------
+unboxedTupleErr :: Name -> Type -> SDoc
unboxedTupleErr name ty
= hang (ptext (sLit "Illegal binding of unboxed tuple"))
4 (ppr name <+> dcolon <+> ppr ty)
-----------------------------------------------
+restrictedBindCtxtErr :: [Name] -> SDoc
restrictedBindCtxtErr binder_names
= hang (ptext (sLit "Illegal overloaded type signature(s)"))
4 (vcat [ptext (sLit "in a binding group for") <+> pprBinders binder_names,
ptext (sLit "that falls under the monomorphism restriction")])
+genCtxt :: [Name] -> SDoc
genCtxt binder_names
= ptext (sLit "When generalising the type(s) for") <+> pprBinders binder_names
-missingSigWarn False name ty = return ()
+missingSigWarn :: Bool -> Name -> Type -> TcM ()
+missingSigWarn False _ _ = return ()
missingSigWarn True name ty
= do { env0 <- tcInitTidyEnv
; let (env1, tidy_ty) = tidyOpenType env0 ty
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