\section[RnSource]{Main pass of renamer}
\begin{code}
-module RnSource ( rnDecl, rnSourceDecls, rnHsType, rnHsSigType ) where
+module RnSource ( rnDecl, rnTyClDecl, rnRuleDecl, rnInstDecl,
+ rnSourceDecls, rnHsType, rnHsSigType
+ ) where
#include "HsVersions.h"
import RnExpr
import HsSyn
-import HsPragmas
import HsTypes ( hsTyVarNames, pprHsContext )
-import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, isRdrTyVar, mkRdrNameWkr )
+import RdrName ( RdrName, isRdrDataCon, rdrNameOcc, mkRdrNameWkr )
import RdrHsSyn ( RdrNameContext, RdrNameHsType, RdrNameConDecl,
extractRuleBndrsTyVars, extractHsTyRdrTyVars,
- extractHsTysRdrTyVars, extractHsCtxtRdrTyVars
+ extractHsCtxtRdrTyVars, extractGenericPatTyVars
)
import RnHsSyn
import HsCore
-import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs, unknownSigErr )
-import RnEnv ( bindTyVarsRn, lookupTopBndrRn, lookupOccRn, newIPName,
- lookupOrigName, lookupOrigNames, lookupSysBinder,
- bindLocalsRn, bindLocalRn, bindLocalsFVRn, bindUVarRn,
+import RnBinds ( rnTopBinds, rnMethodBinds, renameSigs )
+import RnEnv ( lookupTopBndrRn, lookupOccRn, newIPName,
+ lookupOrigNames, lookupSysBinder, newLocalsRn,
+ bindLocalsFVRn, bindUVarRn,
bindTyVarsFVRn, bindTyVarsFV2Rn, extendTyVarEnvFVRn,
bindCoreLocalFVRn, bindCoreLocalsFVRn, bindLocalNames,
checkDupOrQualNames, checkDupNames,
import RnMonad
import FunDeps ( oclose )
-import Class ( FunDep )
-
-import Name ( Name, OccName,
- ExportFlag(..), Provenance(..),
- nameOccName, NamedThing(..)
- )
+import Class ( FunDep, DefMeth (..) )
+import Name ( Name, OccName, nameOccName, NamedThing(..) )
import NameSet
-import OccName ( mkDefaultMethodOcc )
import FiniteMap ( elemFM )
-import PrelInfo ( derivableClassKeys, cCallishClassKeys,
- deRefStablePtr_RDR, makeStablePtr_RDR,
+import PrelInfo ( derivableClassKeys, cCallishClassKeys )
+import PrelNames ( deRefStablePtr_RDR, makeStablePtr_RDR,
bindIO_RDR, returnIO_RDR
)
-import Bag ( bagToList )
import List ( partition, nub )
import Outputable
import SrcLoc ( SrcLoc )
-import CmdLineOpts ( opt_GlasgowExts, opt_WarnUnusedMatches ) -- Warn of unused for-all'd tyvars
+import CmdLineOpts ( DynFlag(..) )
+ -- Warn of unused for-all'd tyvars
import Unique ( Uniquable(..) )
import ErrUtils ( Message )
import CStrings ( isCLabelString )
-import Maybes ( maybeToBool, catMaybes )
-import Util
+import ListSetOps ( removeDupsEq )
\end{code}
@rnDecl@ `renames' declarations.
rnDecl (ValD binds) = rnTopBinds binds `thenRn` \ (new_binds, fvs) ->
returnRn (ValD new_binds, fvs)
+rnDecl (TyClD tycl_decl) = rnTyClDecl tycl_decl `thenRn` \ (new_decl, fvs) ->
+ returnRn (TyClD new_decl, fvs)
-rnDecl (SigD (IfaceSig name ty id_infos loc))
- = pushSrcLocRn loc $
- lookupTopBndrRn name `thenRn` \ name' ->
- rnHsType doc_str ty `thenRn` \ (ty',fvs1) ->
- mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) ->
- returnRn (SigD (IfaceSig name' ty' id_infos' loc), fvs1 `plusFV` fvs2)
+rnDecl (RuleD rule)
+ = rnRuleDecl rule `thenRn` \ (new_rule, fvs) ->
+ returnRn (RuleD new_rule, fvs)
+
+rnDecl (InstD inst)
+ = rnInstDecl inst `thenRn` \ (new_inst, fvs) ->
+ returnRn (InstD new_inst, fvs)
+
+rnDecl (DefD (DefaultDecl tys src_loc))
+ = pushSrcLocRn src_loc $
+ rnHsTypes doc_str tys `thenRn` \ (tys', fvs) ->
+ returnRn (DefD (DefaultDecl tys' src_loc), fvs)
where
- doc_str = text "the interface signature for" <+> quotes (ppr name)
+ doc_str = text "a `default' declaration"
+
+rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
+ = pushSrcLocRn src_loc $
+ lookupOccRn name `thenRn` \ name' ->
+ let
+ extra_fvs FoExport
+ | isDyn = lookupOrigNames [makeStablePtr_RDR, deRefStablePtr_RDR,
+ bindIO_RDR, returnIO_RDR]
+ | otherwise =
+ lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs ->
+ returnRn (addOneFV fvs name')
+ extra_fvs other = returnRn emptyFVs
+ in
+ checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_`
+
+ extra_fvs imp_exp `thenRn` \ fvs1 ->
+
+ rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs2) ->
+ returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc),
+ fvs1 `plusFV` fvs2)
+ where
+ fo_decl_msg = ptext SLIT("a foreign declaration")
+ isDyn = isDynamicExtName ext_nm
+
+ ok_ext_nm Dynamic = True
+ ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb
+ ok_ext_nm (ExtName nm Nothing) = isCLabelString nm
+\end{code}
+
+
+%*********************************************************
+%* *
+\subsection{Instance declarations}
+%* *
+%*********************************************************
+
+\begin{code}
+rnInstDecl (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc)
+ = pushSrcLocRn src_loc $
+ rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
+ let
+ inst_tyvars = case inst_ty' of
+ HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars
+ other -> []
+ -- (Slightly strangely) the forall-d tyvars scope over
+ -- the method bindings too
+ in
+
+ -- Rename the bindings
+ -- NB meth_names can be qualified!
+ checkDupNames meth_doc meth_names `thenRn_`
+ extendTyVarEnvFVRn (map hsTyVarName inst_tyvars) (
+ rnMethodBinds [] mbinds
+ ) `thenRn` \ (mbinds', meth_fvs) ->
+ let
+ binders = collectMonoBinders mbinds'
+ binder_set = mkNameSet binders
+ in
+ -- Rename the prags and signatures.
+ -- Note that the type variables are not in scope here,
+ -- so that instance Eq a => Eq (T a) where
+ -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
+ -- works OK.
+ --
+ -- But the (unqualified) method names are in scope
+ bindLocalNames binders (
+ renameSigs (okInstDclSig binder_set) uprags
+ ) `thenRn` \ (new_uprags, prag_fvs) ->
+
+ (case maybe_dfun_rdr_name of
+ Nothing -> returnRn (Nothing, emptyFVs)
+
+ Just dfun_rdr_name -> lookupSysBinder dfun_rdr_name `thenRn` \ dfun_name ->
+ returnRn (Just dfun_name, unitFV dfun_name)
+ ) `thenRn` \ (maybe_dfun_name, dfun_fv) ->
+
+ -- The typechecker checks that all the bindings are for the right class.
+ returnRn (InstDecl inst_ty' mbinds' new_uprags maybe_dfun_name src_loc,
+ inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv)
+ where
+ meth_doc = text "the bindings in an instance declaration"
+ meth_names = collectLocatedMonoBinders mbinds
+\end{code}
+
+%*********************************************************
+%* *
+\subsection{Rules}
+%* *
+%*********************************************************
+
+\begin{code}
+rnRuleDecl (IfaceRule rule_name vars fn args rhs src_loc)
+ = pushSrcLocRn src_loc $
+ lookupOccRn fn `thenRn` \ fn' ->
+ rnCoreBndrs vars $ \ vars' ->
+ mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) ->
+ rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
+ returnRn (IfaceRule rule_name vars' fn' args' rhs' src_loc,
+ (fvs1 `plusFV` fvs2) `addOneFV` fn')
+
+rnRuleDecl (HsRule rule_name tvs vars lhs rhs src_loc)
+ = ASSERT( null tvs )
+ pushSrcLocRn src_loc $
+
+ bindTyVarsFV2Rn doc (map UserTyVar sig_tvs) $ \ sig_tvs' _ ->
+ bindLocalsFVRn doc (map get_var vars) $ \ ids ->
+ mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) ->
+
+ rnExpr lhs `thenRn` \ (lhs', fv_lhs) ->
+ rnExpr rhs `thenRn` \ (rhs', fv_rhs) ->
+ checkRn (validRuleLhs ids lhs')
+ (badRuleLhsErr rule_name lhs') `thenRn_`
+ let
+ bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
+ in
+ mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
+ returnRn (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc,
+ fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
+ where
+ doc = text "the transformation rule" <+> ptext rule_name
+ sig_tvs = extractRuleBndrsTyVars vars
+
+ get_var (RuleBndr v) = v
+ get_var (RuleBndrSig v _) = v
+
+ rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
+ rn_var (RuleBndrSig v t, id) = rnHsType doc t `thenRn` \ (t', fvs) ->
+ returnRn (RuleBndrSig id t', fvs)
\end{code}
+
%*********************************************************
%* *
-\subsection{Type declarations}
+\subsection{Type, class and iface sig declarations}
%* *
%*********************************************************
However, we can also do some scoping checks at the same time.
\begin{code}
-rnDecl (TyClD (TyData new_or_data context tycon tyvars condecls nconstrs derivings pragmas src_loc))
+rnTyClDecl (IfaceSig name ty id_infos loc)
+ = pushSrcLocRn loc $
+ lookupTopBndrRn name `thenRn` \ name' ->
+ rnHsType doc_str ty `thenRn` \ (ty',fvs1) ->
+ mapFvRn rnIdInfo id_infos `thenRn` \ (id_infos', fvs2) ->
+ returnRn (IfaceSig name' ty' id_infos' loc, fvs1 `plusFV` fvs2)
+ where
+ doc_str = text "the interface signature for" <+> quotes (ppr name)
+
+rnTyClDecl (TyData new_or_data context tycon tyvars condecls nconstrs derivings src_loc gen_name1 gen_name2)
= pushSrcLocRn src_loc $
lookupTopBndrRn tycon `thenRn` \ tycon' ->
bindTyVarsFVRn data_doc tyvars $ \ tyvars' ->
rnContext data_doc context `thenRn` \ (context', cxt_fvs) ->
checkDupOrQualNames data_doc con_names `thenRn_`
mapFvRn rnConDecl condecls `thenRn` \ (condecls', con_fvs) ->
+ lookupSysBinder gen_name1 `thenRn` \ name1' ->
+ lookupSysBinder gen_name2 `thenRn` \ name2' ->
rnDerivs derivings `thenRn` \ (derivings', deriv_fvs) ->
- ASSERT(isNoDataPragmas pragmas)
- returnRn (TyClD (TyData new_or_data context' tycon' tyvars' condecls' nconstrs
- derivings' noDataPragmas src_loc),
+ returnRn (TyData new_or_data context' tycon' tyvars' condecls' nconstrs
+ derivings' src_loc name1' name2',
cxt_fvs `plusFV` con_fvs `plusFV` deriv_fvs)
where
data_doc = text "the data type declaration for" <+> quotes (ppr tycon)
con_names = map conDeclName condecls
-rnDecl (TyClD (TySynonym name tyvars ty src_loc))
+rnTyClDecl (TySynonym name tyvars ty src_loc)
= pushSrcLocRn src_loc $
+ doptRn Opt_GlasgowExts `thenRn` \ glaExts ->
lookupTopBndrRn name `thenRn` \ name' ->
bindTyVarsFVRn syn_doc tyvars $ \ tyvars' ->
- rnHsType syn_doc (unquantify ty) `thenRn` \ (ty', ty_fvs) ->
- returnRn (TyClD (TySynonym name' tyvars' ty' src_loc), ty_fvs)
+ rnHsType syn_doc (unquantify glaExts ty) `thenRn` \ (ty', ty_fvs) ->
+ returnRn (TySynonym name' tyvars' ty' src_loc, ty_fvs)
where
syn_doc = text "the declaration for type synonym" <+> quotes (ppr name)
-- For H98 we do *not* universally quantify on the RHS of a synonym
-- Silently discard context... but the tyvars in the rest won't be in scope
- unquantify (HsForAllTy Nothing ctxt ty) | not opt_GlasgowExts = ty
- unquantify ty = ty
+ unquantify glaExts (HsForAllTy Nothing ctxt ty) | glaExts = ty
+ unquantify glaExys ty = ty
-rnDecl (TyClD (ClassDecl context cname tyvars fds sigs mbinds pragmas
- tname dname dwname snames src_loc))
+rnTyClDecl (ClassDecl context cname tyvars fds sigs mbinds names src_loc)
= pushSrcLocRn src_loc $
lookupTopBndrRn cname `thenRn` \ cname' ->
-- So the 'Imported' part of this call is not relevant.
-- Unclean; but since these two are the only place this happens
-- I can't work up the energy to do it more beautifully
- lookupSysBinder tname `thenRn` \ tname' ->
- lookupSysBinder dname `thenRn` \ dname' ->
- lookupSysBinder dwname `thenRn` \ dwname' ->
- mapRn lookupSysBinder snames `thenRn` \ snames' ->
+
+ mapRn lookupSysBinder names `thenRn` \ names' ->
-- Tyvars scope over bindings and context
bindTyVarsFV2Rn cls_doc tyvars ( \ clas_tyvar_names tyvars' ->
rnContext cls_doc context `thenRn` \ (context', cxt_fvs) ->
-- Check the functional dependencies
- rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) ->
+ rnFds cls_doc fds `thenRn` \ (fds', fds_fvs) ->
-- Check the signatures
+ -- First process the class op sigs (op_sigs), then the fixity sigs (non_op_sigs).
let
- -- First process the class op sigs, then the fixity sigs.
- (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ (op_sigs, non_op_sigs) = partition isClassOpSig sigs
+ sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
in
checkDupOrQualNames sig_doc sig_rdr_names_w_locs `thenRn_`
mapFvRn (rn_op cname' clas_tyvar_names fds') op_sigs `thenRn` \ (sigs', sig_fvs) ->
let
- binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
+ binders = mkNameSet [ nm | (ClassOpSig nm _ _ _) <- sigs' ]
in
renameSigs (okClsDclSig binders) non_op_sigs `thenRn` \ (non_ops', fix_fvs) ->
-- Check the methods
+ -- The newLocals call is tiresome: given a generic class decl
+ -- class C a where
+ -- op :: a -> a
+ -- op {| x+y |} (Inl a) = ...
+ -- op {| x+y |} (Inr b) = ...
+ -- op {| a*b |} (a*b) = ...
+ -- we want to name both "x" tyvars with the same unique, so that they are
+ -- easy to group together in the typechecker.
+ -- Hence the
+ getLocalNameEnv `thenRn` \ name_env ->
+ let
+ meth_rdr_names_w_locs = collectLocatedMonoBinders mbinds
+ gen_rdr_tyvars_w_locs = [(tv,src_loc) | tv <- extractGenericPatTyVars mbinds,
+ not (tv `elemFM` name_env)]
+ in
checkDupOrQualNames meth_doc meth_rdr_names_w_locs `thenRn_`
- rnMethodBinds mbinds `thenRn` \ (mbinds', meth_fvs) ->
+ newLocalsRn mkLocalName gen_rdr_tyvars_w_locs `thenRn` \ gen_tyvars ->
+ rnMethodBinds gen_tyvars mbinds `thenRn` \ (mbinds', meth_fvs) ->
-- Typechecker is responsible for checking that we only
-- give default-method bindings for things in this class.
-- The renamer *could* check this for class decls, but can't
-- for instance decls.
- ASSERT(isNoClassPragmas pragmas)
- returnRn (TyClD (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') mbinds'
- NoClassPragmas tname' dname' dwname' snames' src_loc),
+ returnRn (ClassDecl context' cname' tyvars' fds' (non_ops' ++ sigs') mbinds'
+ names' src_loc,
sig_fvs `plusFV`
+
fix_fvs `plusFV`
cxt_fvs `plusFV`
fds_fvs `plusFV`
sig_doc = text "the signatures for class" <+> ppr cname
meth_doc = text "the default-methods for class" <+> ppr cname
- sig_rdr_names_w_locs = [(op,locn) | ClassOpSig op _ _ locn <- sigs]
- meth_rdr_names_w_locs = bagToList (collectMonoBinders mbinds)
-
rn_op clas clas_tyvars clas_fds sig@(ClassOpSig op maybe_dm_stuff ty locn)
= pushSrcLocRn locn $
lookupTopBndrRn op `thenRn` \ op_name ->
(case maybe_dm_stuff of
Nothing -> returnRn (Nothing, emptyFVs) -- Source-file class decl
- Just (dm_rdr_name, explicit_dm)
+ Just (DefMeth dm_rdr_name)
-> -- Imported class that has a default method decl
-- See comments with tname, snames, above
lookupSysBinder dm_rdr_name `thenRn` \ dm_name ->
- returnRn (Just (dm_name, explicit_dm),
- if explicit_dm then unitFV dm_name else emptyFVs)
+ returnRn (Just (DefMeth dm_name), unitFV dm_name)
-- An imported class decl for a class decl that had an explicit default
-- method, mentions, rather than defines,
-- the default method, so we must arrange to pull it in
+ Just GenDefMeth
+ -> returnRn (Just GenDefMeth, emptyFVs)
+ Just NoDefMeth
+ -> returnRn (Just NoDefMeth, emptyFVs)
) `thenRn` \ (maybe_dm_stuff', dm_fvs) ->
returnRn (ClassOpSig op_name maybe_dm_stuff' new_ty locn, op_ty_fvs `plusFV` dm_fvs)
%*********************************************************
%* *
-\subsection{Instance declarations}
-%* *
-%*********************************************************
-
-\begin{code}
-rnDecl (InstD (InstDecl inst_ty mbinds uprags maybe_dfun_rdr_name src_loc))
- = pushSrcLocRn src_loc $
- rnHsSigType (text "an instance decl") inst_ty `thenRn` \ (inst_ty', inst_fvs) ->
- let
- inst_tyvars = case inst_ty' of
- HsForAllTy (Just inst_tyvars) _ _ -> inst_tyvars
- other -> []
- -- (Slightly strangely) the forall-d tyvars scope over
- -- the method bindings too
- in
-
- -- Rename the bindings
- -- NB meth_names can be qualified!
- checkDupNames meth_doc meth_names `thenRn_`
- extendTyVarEnvFVRn inst_tyvars (
- rnMethodBinds mbinds
- ) `thenRn` \ (mbinds', meth_fvs) ->
- let
- binders = map fst (bagToList (collectMonoBinders mbinds'))
- binder_set = mkNameSet binders
- in
- -- Rename the prags and signatures.
- -- Note that the type variables are not in scope here,
- -- so that instance Eq a => Eq (T a) where
- -- {-# SPECIALISE instance Eq a => Eq (T [a]) #-}
- -- works OK.
- --
- -- But the (unqualified) method names are in scope
- bindLocalNames binders (
- renameSigs (okInstDclSig binder_set) uprags
- ) `thenRn` \ (new_uprags, prag_fvs) ->
-
- (case maybe_dfun_rdr_name of
- Nothing -> returnRn (Nothing, emptyFVs)
-
- Just dfun_rdr_name -> lookupSysBinder dfun_rdr_name `thenRn` \ dfun_name ->
- returnRn (Just dfun_name, unitFV dfun_name)
- ) `thenRn` \ (maybe_dfun_name, dfun_fv) ->
-
- -- The typechecker checks that all the bindings are for the right class.
- returnRn (InstD (InstDecl inst_ty' mbinds' new_uprags maybe_dfun_name src_loc),
- inst_fvs `plusFV` meth_fvs `plusFV` prag_fvs `plusFV` dfun_fv)
- where
- meth_doc = text "the bindings in an instance declaration"
- meth_names = bagToList (collectMonoBinders mbinds)
-\end{code}
-
-%*********************************************************
-%* *
-\subsection{Default declarations}
-%* *
-%*********************************************************
-
-\begin{code}
-rnDecl (DefD (DefaultDecl tys src_loc))
- = pushSrcLocRn src_loc $
- rnHsTypes doc_str tys `thenRn` \ (tys', fvs) ->
- returnRn (DefD (DefaultDecl tys' src_loc), fvs)
- where
- doc_str = text "a `default' declaration"
-\end{code}
-
-%*********************************************************
-%* *
-\subsection{Foreign declarations}
-%* *
-%*********************************************************
-
-\begin{code}
-rnDecl (ForD (ForeignDecl name imp_exp ty ext_nm cconv src_loc))
- = pushSrcLocRn src_loc $
- lookupOccRn name `thenRn` \ name' ->
- let
- extra_fvs FoExport
- | isDyn = lookupOrigNames [makeStablePtr_RDR, deRefStablePtr_RDR,
- bindIO_RDR, returnIO_RDR]
- | otherwise =
- lookupOrigNames [bindIO_RDR, returnIO_RDR] `thenRn` \ fvs ->
- returnRn (addOneFV fvs name')
- extra_fvs other = returnRn emptyFVs
- in
- checkRn (ok_ext_nm ext_nm) (badExtName ext_nm) `thenRn_`
-
- extra_fvs imp_exp `thenRn` \ fvs1 ->
-
- rnHsSigType fo_decl_msg ty `thenRn` \ (ty', fvs2) ->
- returnRn (ForD (ForeignDecl name' imp_exp ty' ext_nm cconv src_loc),
- fvs1 `plusFV` fvs2)
- where
- fo_decl_msg = ptext SLIT("a foreign declaration")
- isDyn = isDynamicExtName ext_nm
-
- ok_ext_nm Dynamic = True
- ok_ext_nm (ExtName nm (Just mb)) = isCLabelString nm && isCLabelString mb
- ok_ext_nm (ExtName nm Nothing) = isCLabelString nm
-\end{code}
-
-%*********************************************************
-%* *
-\subsection{Rules}
-%* *
-%*********************************************************
-
-\begin{code}
-rnDecl (RuleD (IfaceRule rule_name vars fn args rhs src_loc))
- = pushSrcLocRn src_loc $
- lookupOccRn fn `thenRn` \ fn' ->
- rnCoreBndrs vars $ \ vars' ->
- mapFvRn rnCoreExpr args `thenRn` \ (args', fvs1) ->
- rnCoreExpr rhs `thenRn` \ (rhs', fvs2) ->
- returnRn (RuleD (IfaceRule rule_name vars' fn' args' rhs' src_loc),
- (fvs1 `plusFV` fvs2) `addOneFV` fn')
-
-rnDecl (RuleD (IfaceRuleOut fn rule))
- -- This one is used for BuiltInRules
- -- The rule itself is already done, but the thing
- -- to attach it to is not.
- = lookupOccRn fn `thenRn` \ fn' ->
- returnRn (RuleD (IfaceRuleOut fn' rule), unitFV fn')
-
-rnDecl (RuleD (HsRule rule_name tvs vars lhs rhs src_loc))
- = ASSERT( null tvs )
- pushSrcLocRn src_loc $
-
- bindTyVarsFV2Rn doc (map UserTyVar sig_tvs) $ \ sig_tvs' _ ->
- bindLocalsFVRn doc (map get_var vars) $ \ ids ->
- mapFvRn rn_var (vars `zip` ids) `thenRn` \ (vars', fv_vars) ->
-
- rnExpr lhs `thenRn` \ (lhs', fv_lhs) ->
- rnExpr rhs `thenRn` \ (rhs', fv_rhs) ->
- checkRn (validRuleLhs ids lhs')
- (badRuleLhsErr rule_name lhs') `thenRn_`
- let
- bad_vars = [var | var <- ids, not (var `elemNameSet` fv_lhs)]
- in
- mapRn (addErrRn . badRuleVar rule_name) bad_vars `thenRn_`
- returnRn (RuleD (HsRule rule_name sig_tvs' vars' lhs' rhs' src_loc),
- fv_vars `plusFV` fv_lhs `plusFV` fv_rhs)
- where
- doc = text "the transformation rule" <+> ptext rule_name
- sig_tvs = extractRuleBndrsTyVars vars
-
- get_var (RuleBndr v) = v
- get_var (RuleBndrSig v _) = v
-
- rn_var (RuleBndr v, id) = returnRn (RuleBndr id, emptyFVs)
- rn_var (RuleBndrSig v t, id) = rnHsType doc t `thenRn` \ (t', fvs) ->
- returnRn (RuleBndrSig id t', fvs)
-\end{code}
-
-
-%*********************************************************
-%* *
\subsection{Support code for type/data declarations}
%* *
%*********************************************************
rnBangTy doc ty2 `thenRn` \ (new_ty2, fvs2) ->
returnRn (InfixCon new_ty1 new_ty2, fvs1 `plusFV` fvs2)
-rnConDetails doc locn (NewCon ty mb_field)
- = rnHsType doc ty `thenRn` \ (new_ty, fvs) ->
- rn_field mb_field `thenRn` \ new_mb_field ->
- returnRn (NewCon new_ty new_mb_field, fvs)
- where
- rn_field Nothing = returnRn Nothing
- rn_field (Just f) =
- lookupTopBndrRn f `thenRn` \ new_f ->
- returnRn (Just new_f)
-
rnConDetails doc locn (RecCon fields)
= checkDupOrQualNames doc field_names `thenRn_`
mapFvRn (rnField doc) fields `thenRn` \ (new_fields, fvs) ->
-- Explicitly quantified but not mentioned in ctxt or tau
warn_guys = filter (`notElem` mentioned) forall_tyvar_names
in
- mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
+ mapRn_ (forAllWarn doc tau) warn_guys `thenRn_`
rnForAll doc forall_tyvars ctxt tau
rnHsType doc (HsTyVar tyvar)
= lookupOccRn tyvar `thenRn` \ tyvar' ->
returnRn (HsTyVar tyvar', unitFV tyvar')
+rnHsType doc (HsOpTy ty1 opname ty2)
+ = lookupOccRn opname `thenRn` \ name' ->
+ rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
+ rnHsType doc ty2 `thenRn` \ (ty2',fvs2) ->
+ returnRn (HsOpTy ty1' name' ty2', fvs1 `plusFV` fvs2 `addOneFV` name')
+
+rnHsType doc (HsNumTy i)
+ | i == 1 = returnRn (HsNumTy i, emptyFVs)
+ | otherwise = failWithRn (HsNumTy i, emptyFVs)
+ (ptext SLIT("Only unit numeric type pattern is valid"))
+
rnHsType doc (HsFunTy ty1 ty2)
= rnHsType doc ty1 `thenRn` \ (ty1', fvs1) ->
-- Might find a for-all as the arg of a function type
rnIdInfo (HsUnfold inline expr) = rnCoreExpr expr `thenRn` \ (expr', fvs) ->
returnRn (HsUnfold inline expr', fvs)
rnIdInfo (HsArity arity) = returnRn (HsArity arity, emptyFVs)
-rnIdInfo (HsUpdate update) = returnRn (HsUpdate update, emptyFVs)
rnIdInfo HsNoCafRefs = returnRn (HsNoCafRefs, emptyFVs)
rnIdInfo HsCprInfo = returnRn (HsCprInfo, emptyFVs)
= hsep [ptext SLIT("Illegal data constructor name"), quotes (ppr name)]
forAllWarn doc ty tyvar
- | not opt_WarnUnusedMatches = returnRn ()
- | otherwise
- = getModeRn `thenRn` \ mode ->
- case mode of {
+ = doptRn Opt_WarnUnusedMatches `thenRn` \ warn_unused -> case () of
+ () | not warn_unused -> returnRn ()
+ | otherwise
+ -> getModeRn `thenRn` \ mode ->
+ case mode of {
#ifndef DEBUG
- InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files
- -- unless DEBUG is on, in which case it is slightly
- -- informative. They can arise from mkRhsTyLam,
-#endif -- leading to (say) f :: forall a b. [b] -> [b]
- other ->
-
- addWarnRn (
- sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
- nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
- $$
- (ptext SLIT("In") <+> doc))
- }
-
-forAllErr doc ty tyvar
- = addErrRn (
- sep [ptext SLIT("The constrained type variable") <+> quotes (ppr tyvar),
- nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
- $$
- (ptext SLIT("In") <+> doc))
+ InterfaceMode -> returnRn () ; -- Don't warn of unused tyvars in interface files
+ -- unless DEBUG is on, in which case it is slightly
+ -- informative. They can arise from mkRhsTyLam,
+#endif -- leading to (say) f :: forall a b. [b] -> [b]
+ other ->
+ addWarnRn (
+ sep [ptext SLIT("The universally quantified type variable") <+> quotes (ppr tyvar),
+ nest 4 (ptext SLIT("does not appear in the type") <+> quotes (ppr ty))]
+ $$
+ (ptext SLIT("In") <+> doc)
+ )
+ }
badRuleLhsErr name lhs
= sep [ptext SLIT("Rule") <+> ptext name <> colon,
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