X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=ghc%2Fcompiler%2Ftypecheck%2FTcModule.lhs;h=2789fa86ad99bdedd5428f09bf72278e1089d9df;hb=ab7fb945890d4a6895d83d60d44260772d3160d4;hp=1387888d9297f26e89047eeec1a5dd196a129bb4;hpb=88f315a135bd00d2efa00d991bb9487929562d91;p=ghc-hetmet.git diff --git a/ghc/compiler/typecheck/TcModule.lhs b/ghc/compiler/typecheck/TcModule.lhs index 1387888..2789fa8 100644 --- a/ghc/compiler/typecheck/TcModule.lhs +++ b/ghc/compiler/typecheck/TcModule.lhs @@ -5,59 +5,63 @@ \begin{code} module TcModule ( - typecheckModule, - TcResults(..) + typecheckModule, typecheckExpr, TcResults(..) ) where #include "HsVersions.h" import CmdLineOpts ( DynFlag(..), DynFlags, opt_PprStyle_Debug ) -import HsSyn ( HsBinds(..), MonoBinds(..), HsDecl(..) ) +import HsSyn ( HsBinds(..), MonoBinds(..), HsDecl(..), HsExpr(..), + isIfaceRuleDecl, nullBinds, andMonoBindList + ) import HsTypes ( toHsType ) -import RnHsSyn ( RenamedHsDecl ) -import TcHsSyn ( TypecheckedMonoBinds, +import PrelNames ( mAIN_Name, mainName, ioTyConName, printName ) +import RnHsSyn ( RenamedHsBinds, RenamedHsDecl, RenamedHsExpr ) +import TcHsSyn ( TypecheckedMonoBinds, TypecheckedHsExpr, TypecheckedForeignDecl, TypecheckedRuleDecl, - zonkTopBinds, zonkForeignExports, zonkRules + zonkTopBinds, zonkForeignExports, zonkRules, mkHsLet, + zonkExpr ) + import TcMonad +import TcType ( newTyVarTy, zonkTcType, tcInstType ) +import TcUnify ( unifyTauTy ) import Inst ( plusLIE ) +import VarSet ( varSetElems ) import TcBinds ( tcTopBinds ) -import TcClassDcl ( tcClassDecls2, mkImplicitClassBinds ) -import TcDefaults ( tcDefaults ) -import TcEnv ( TcEnv, InstInfo(iDFunId), tcExtendGlobalValEnv, - tcEnvTyCons, tcEnvClasses, isLocalThing, - tcSetEnv, tcSetInstEnv, initTcEnv, getTcGEnv +import TcClassDcl ( tcClassDecls2 ) +import TcDefaults ( tcDefaults, defaultDefaultTys ) +import TcExpr ( tcMonoExpr ) +import TcEnv ( TcEnv, InstInfo, tcExtendGlobalValEnv, tcLookup_maybe, + isLocalThing, tcSetEnv, tcSetInstEnv, initTcEnv, getTcGEnv, + TcTyThing(..), tcLookupTyCon ) -import TcRules ( tcRules ) +import TcRules ( tcIfaceRules, tcSourceRules ) import TcForeign ( tcForeignImports, tcForeignExports ) import TcIfaceSig ( tcInterfaceSigs ) import TcInstDcls ( tcInstDecls1, tcInstDecls2 ) -import TcSimplify ( tcSimplifyTop ) +import TcSimplify ( tcSimplifyTop, tcSimplifyInfer ) import TcTyClsDecls ( tcTyAndClassDecls ) -import TcTyDecls ( mkImplicitDataBinds ) - -import CoreUnfold ( unfoldingTemplate ) -import Type ( funResultTy, splitForAllTys ) -import Bag ( isEmptyBag ) -import ErrUtils ( printErrorsAndWarnings, dumpIfSet_dyn ) -import Id ( idType, idName, idUnfolding ) -import Module ( Module ) -import Name ( Name, nameOccName, isLocallyDefined, isGlobalName, - toRdrName, nameEnvElts, lookupNameEnv, - ) -import TyCon ( tyConGenInfo, isClassTyCon ) -import OccName ( isSysOcc ) -import Maybes ( thenMaybe ) + +import CoreUnfold ( unfoldingTemplate, hasUnfolding ) +import Type ( funResultTy, splitForAllTys, mkForAllTys, mkFunTys, + liftedTypeKind, openTypeKind, mkTyConApp, tyVarsOfType, tidyType ) +import ErrUtils ( printErrorsAndWarnings, errorsFound, dumpIfSet_dyn, showPass ) +import Id ( idType, idName, isLocalId, idUnfolding ) +import Module ( Module, isHomeModule, moduleName ) +import Name ( Name, toRdrName, isGlobalName ) +import Name ( nameEnvElts, lookupNameEnv ) +import TyCon ( tyConGenInfo ) import Util import BasicTypes ( EP(..), Fixity ) -import Bag ( isEmptyBag ) import Outputable -import HscTypes ( PersistentCompilerState(..), HomeSymbolTable, HomeIfaceTable, - PackageTypeEnv, DFunId, ModIface(..), - TypeEnv, extendTypeEnvList, lookupIface, - TyThing(..), mkTypeEnv ) -import List ( partition ) +import HscTypes ( PersistentCompilerState(..), HomeSymbolTable, + PackageTypeEnv, ModIface(..), + TypeEnv, extendTypeEnvList, + TyThing(..), implicitTyThingIds, + mkTypeEnv + ) \end{code} Outside-world interface: @@ -66,12 +70,8 @@ Outside-world interface: -- Convenient type synonyms first: data TcResults = TcResults { - tc_pcs :: PersistentCompilerState, -- Augmented with imported information, - -- (but not stuff from this module) - -- All these fields have info *just for this module* tc_env :: TypeEnv, -- The top level TypeEnv - tc_insts :: [DFunId], -- Instances tc_binds :: TypecheckedMonoBinds, -- Bindings tc_fords :: [TypecheckedForeignDecl], -- Foreign import & exports. tc_rules :: [TypecheckedRuleDecl] -- Transformation rules @@ -80,38 +80,113 @@ data TcResults --------------- typecheckModule :: DynFlags - -> Module -> PersistentCompilerState - -> HomeSymbolTable -> HomeIfaceTable + -> HomeSymbolTable + -> ModIface -- Iface for this module + -> PrintUnqualified -- For error printing -> [RenamedHsDecl] - -> IO (Maybe TcResults) + -> IO (Maybe (PersistentCompilerState, TcResults)) + -- The new PCS is Augmented with imported information, + -- (but not stuff from this module) -typecheckModule dflags this_mod pcs hst hit decls - = do env <- initTcEnv hst (pcs_PTE pcs) - (maybe_result, (warns,errs)) <- initTc dflags env tc_module +typecheckModule dflags pcs hst mod_iface unqual decls + = do { maybe_tc_result <- typecheck dflags pcs hst unqual $ + tcModule pcs hst get_fixity this_mod decls + ; printTcDump dflags maybe_tc_result + ; return maybe_tc_result } + where + this_mod = mi_module mod_iface + fixity_env = mi_fixities mod_iface - let { maybe_tc_result :: Maybe TcResults ; - maybe_tc_result = case maybe_result of - Nothing -> Nothing - Just (_,r) -> Just r } + get_fixity :: Name -> Maybe Fixity + get_fixity nm = lookupNameEnv fixity_env nm - printErrorsAndWarnings (errs,warns) - printTcDump dflags maybe_tc_result +--------------- +typecheckExpr :: DynFlags + -> Bool -- True <=> wrap in 'print' to get a result of IO type + -> PersistentCompilerState + -> HomeSymbolTable + -> PrintUnqualified -- For error printing + -> Module + -> (RenamedHsExpr, -- The expression itself + [RenamedHsDecl]) -- Plus extra decls it sucked in from interface files + -> IO (Maybe (PersistentCompilerState, TypecheckedHsExpr, TcType)) + +typecheckExpr dflags wrap_io pcs hst unqual this_mod (expr, decls) + = typecheck dflags pcs hst unqual $ + + -- use the default default settings, i.e. [Integer, Double] + tcSetDefaultTys defaultDefaultTys $ + tcImports pcs hst get_fixity this_mod decls `thenTc` \ (env, new_pcs, local_inst_info, deriv_binds, local_rules) -> + ASSERT( null local_inst_info && nullBinds deriv_binds && null local_rules ) + + tcSetEnv env $ + tc_expr expr `thenTc` \ (expr', lie, expr_ty) -> + tcSimplifyInfer smpl_doc + (varSetElems (tyVarsOfType expr_ty)) lie `thenTc` \ (qtvs, lie_free, dict_binds, dict_ids) -> + tcSimplifyTop lie_free `thenTc` \ const_binds -> + let all_expr = mkHsLet const_binds $ + TyLam qtvs $ + DictLam dict_ids $ + mkHsLet dict_binds $ + expr' + all_expr_ty = mkForAllTys qtvs (mkFunTys (map idType dict_ids) expr_ty) + in + zonkExpr all_expr `thenNF_Tc` \ zonked_expr -> + zonkTcType all_expr_ty `thenNF_Tc` \ zonked_ty -> + ioToTc (dumpIfSet_dyn dflags + Opt_D_dump_tc "Typechecked" (ppr zonked_expr)) `thenNF_Tc_` + returnTc (new_pcs, zonked_expr, zonked_ty) - if isEmptyBag errs then - return maybe_tc_result - else - return Nothing where - tc_module :: TcM (TcEnv, TcResults) - tc_module = fixTc (\ ~(unf_env ,_) -> tcModule pcs hst get_fixity this_mod decls unf_env) + get_fixity :: Name -> Maybe Fixity + get_fixity n = pprPanic "typecheckExpr" (ppr n) + + smpl_doc = ptext SLIT("main expression") + + -- Typecheck it, wrapping in 'print' if necessary to + -- get a result of type IO t. Returns the result type + -- that is free in the result type + tc_expr e + | wrap_io = tryTc_ (tc_io_expr (HsApp (HsVar printName) e)) -- Recovery case + (tc_io_expr e) -- Main case + | otherwise = newTyVarTy openTypeKind `thenTc` \ ty -> + tcMonoExpr expr ty `thenTc` \ (expr', lie) -> + returnTc (expr', lie, ty) + + where + -- (tc_io_expr e) typechecks 'e' if that gives a result of IO t, + -- or 'print e' otherwise. Either way the result is of type IO t + tc_io_expr e = newTyVarTy openTypeKind `thenTc` \ ty -> + tcLookupTyCon ioTyConName `thenNF_Tc` \ ioTyCon -> + let + res_ty = mkTyConApp ioTyCon [ty] + in + tcMonoExpr expr res_ty `thenTc` \ (expr', lie) -> + returnTc (expr', lie, res_ty) - pit = pcs_PIT pcs +--------------- +typecheck :: DynFlags + -> PersistentCompilerState + -> HomeSymbolTable + -> PrintUnqualified -- For error printing + -> TcM r + -> IO (Maybe r) - get_fixity :: Name -> Maybe Fixity - get_fixity nm = lookupIface hit pit this_mod nm `thenMaybe` \ iface -> - lookupNameEnv (mi_fixities iface) nm +typecheck dflags pcs hst unqual thing_inside + = do { showPass dflags "Typechecker"; + ; env <- initTcEnv hst (pcs_PTE pcs) + + ; (maybe_tc_result, errs) <- initTc dflags env thing_inside + + ; printErrorsAndWarnings unqual errs + + ; if errorsFound errs then + return Nothing + else + return maybe_tc_result + } \end{code} The internal monster: @@ -121,82 +196,42 @@ tcModule :: PersistentCompilerState -> (Name -> Maybe Fixity) -> Module -> [RenamedHsDecl] - -> TcEnv -- The knot-tied environment - -> TcM (TcEnv, TcResults) - - -- (unf_env :: TcEnv) is used for type-checking interface pragmas - -- which is done lazily [ie failure just drops the pragma - -- without having any global-failure effect]. - -- - -- unf_env is also used to get the pragama info - -- for imported dfuns and default methods - -tcModule pcs hst get_fixity this_mod decls unf_env - = -- Type-check the type and class decls - tcTyAndClassDecls unf_env decls `thenTc` \ env -> - tcSetEnv env $ - let - classes = tcEnvClasses env - tycons = tcEnvTyCons env -- INCLUDES tycons derived from classes - in - - -- Typecheck the instance decls, includes deriving - tcInstDecls1 (pcs_insts pcs) (pcs_PRS pcs) - hst unf_env get_fixity this_mod - tycons decls `thenTc` \ (new_pcs_insts, inst_env, local_inst_info, deriv_binds) -> - tcSetInstEnv inst_env $ - - -- Default declarations - tcDefaults decls `thenTc` \ defaulting_tys -> - tcSetDefaultTys defaulting_tys $ - - -- Interface type signatures - -- We tie a knot so that the Ids read out of interfaces are in scope - -- when we read their pragmas. - -- What we rely on is that pragmas are typechecked lazily; if - -- any type errors are found (ie there's an inconsistency) - -- we silently discard the pragma - -- We must do this before mkImplicitDataBinds (which comes next), since - -- the latter looks up unpackCStringId, for example, which is usually - -- imported - tcInterfaceSigs unf_env decls `thenTc` \ sig_ids -> - tcExtendGlobalValEnv sig_ids $ - - -- Create any necessary record selector Ids and their bindings - -- "Necessary" includes data and newtype declarations - -- We don't create bindings for dictionary constructors; - -- they are always fully applied, and the bindings are just there - -- to support partial applications - mkImplicitDataBinds this_mod tycons `thenTc` \ (data_ids, imp_data_binds) -> - mkImplicitClassBinds this_mod classes `thenNF_Tc` \ (cls_ids, imp_cls_binds) -> - - -- Extend the global value environment with - -- (a) constructors - -- (b) record selectors - -- (c) class op selectors - -- (d) default-method ids... where? I can't see where these are - -- put into the envt, and I'm worried that the zonking phase - -- will find they aren't there and complain. - tcExtendGlobalValEnv data_ids $ - tcExtendGlobalValEnv cls_ids $ - + -> TcM (PersistentCompilerState, TcResults) + +tcModule pcs hst get_fixity this_mod decls + = -- Type-check the type and class decls, and all imported decls + -- tcImports recovers internally, but if anything gave rise to + -- an error we'd better stop now, to avoid a cascade + checkNoErrsTc ( + tcImports pcs hst get_fixity this_mod decls + ) `thenTc` \ (env, new_pcs, local_inst_info, deriv_binds, local_rules) -> + + tcSetEnv env $ + -- Foreign import declarations next +-- traceTc (text "Tc4") `thenNF_Tc_` tcForeignImports decls `thenTc` \ (fo_ids, foi_decls) -> tcExtendGlobalValEnv fo_ids $ - -- Value declarations next. - -- We also typecheck any extra binds that came out of the "deriving" process - tcTopBinds (get_binds decls `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env), lie_valdecls) -> + -- Default declarations + tcDefaults decls `thenTc` \ defaulting_tys -> + tcSetDefaultTys defaulting_tys $ + + -- Value declarations next. + -- We also typecheck any extra binds that came out of the "deriving" process +-- traceTc (text "Tc5") `thenNF_Tc_` + tcTopBinds (val_binds `ThenBinds` deriv_binds) `thenTc` \ ((val_binds, env), lie_valdecls) -> tcSetEnv env $ - -- Foreign export declarations next + -- Foreign export declarations next +-- traceTc (text "Tc6") `thenNF_Tc_` tcForeignExports decls `thenTc` \ (lie_fodecls, foe_binds, foe_decls) -> -- Second pass over class and instance declarations, -- to compile the bindings themselves. tcInstDecls2 local_inst_info `thenNF_Tc` \ (lie_instdecls, inst_binds) -> - tcClassDecls2 this_mod decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds) -> - tcRules (pcs_rules pcs) this_mod decls `thenNF_Tc` \ (new_pcs_rules, lie_rules, local_rules) -> + tcClassDecls2 this_mod tycl_decls `thenNF_Tc` \ (lie_clasdecls, cls_dm_binds) -> + tcSourceRules source_rules `thenNF_Tc` \ (lie_rules, more_local_rules) -> -- Deal with constant or ambiguous InstIds. How could -- there be ambiguous ones? They can only arise if a @@ -206,59 +241,195 @@ tcModule pcs hst get_fixity this_mod decls unf_env -- during the generalisation step.) let lie_alldecls = lie_valdecls `plusLIE` - lie_instdecls `plusLIE` - lie_clasdecls `plusLIE` - lie_fodecls `plusLIE` - lie_rules + lie_instdecls `plusLIE` + lie_clasdecls `plusLIE` + lie_fodecls `plusLIE` + lie_rules in tcSimplifyTop lie_alldecls `thenTc` \ const_inst_binds -> + + -- CHECK THAT main IS DEFINED WITH RIGHT TYPE, IF REQUIRED + tcCheckMain this_mod `thenTc_` -- Backsubstitution. This must be done last. -- Even tcSimplifyTop may do some unification. let - all_binds = imp_data_binds `AndMonoBinds` - imp_cls_binds `AndMonoBinds` - val_binds `AndMonoBinds` + all_binds = val_binds `AndMonoBinds` inst_binds `AndMonoBinds` cls_dm_binds `AndMonoBinds` const_inst_binds `AndMonoBinds` foe_binds in +-- traceTc (text "Tc9") `thenNF_Tc_` zonkTopBinds all_binds `thenNF_Tc` \ (all_binds', final_env) -> tcSetEnv final_env $ -- zonkTopBinds puts all the top-level Ids into the tcGEnv zonkForeignExports foe_decls `thenNF_Tc` \ foe_decls' -> - zonkRules local_rules `thenNF_Tc` \ local_rules' -> - + zonkRules more_local_rules `thenNF_Tc` \ more_local_rules' -> - let (local_things, imported_things) = partition (isLocalThing this_mod) - (nameEnvElts (getTcGEnv final_env)) - - local_type_env :: TypeEnv - local_type_env = mkTypeEnv local_things - new_pte :: PackageTypeEnv - new_pte = extendTypeEnvList (pcs_PTE pcs) imported_things - - final_pcs :: PersistentCompilerState - final_pcs = pcs { pcs_PTE = new_pte, - pcs_insts = new_pcs_insts, - pcs_rules = new_pcs_rules - } + let local_things = filter (isLocalThing this_mod) (nameEnvElts (getTcGEnv final_env)) + + -- Create any necessary "implicit" bindings (data constructors etc) + -- Should we create bindings for dictionary constructors? + -- They are always fully applied, and the bindings are just there + -- to support partial applications. But it's easier to let them through. + implicit_binds = andMonoBindList [ CoreMonoBind id (unfoldingTemplate unf) + | id <- implicitTyThingIds local_things + , let unf = idUnfolding id + , hasUnfolding unf + ] + + local_type_env :: TypeEnv + local_type_env = mkTypeEnv local_things + + all_local_rules = local_rules ++ more_local_rules' in - returnTc (final_env, - TcResults { tc_pcs = final_pcs, - tc_env = local_type_env, - tc_binds = all_binds', - tc_insts = map iDFunId local_inst_info, +-- traceTc (text "Tc10") `thenNF_Tc_` + returnTc (new_pcs, + TcResults { tc_env = local_type_env, + tc_binds = implicit_binds `AndMonoBinds` all_binds', tc_fords = foi_decls ++ foe_decls', - tc_rules = local_rules' - }) - -get_binds decls = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls] + tc_rules = all_local_rules + } + ) + where + tycl_decls = [d | TyClD d <- decls] + val_binds = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls] + source_rules = [d | RuleD d <- decls, not (isIfaceRuleDecl d)] \end{code} +\begin{code} +tcImports :: PersistentCompilerState + -> HomeSymbolTable + -> (Name -> Maybe Fixity) + -> Module + -> [RenamedHsDecl] + -> TcM (TcEnv, PersistentCompilerState, + [InstInfo], RenamedHsBinds, [TypecheckedRuleDecl]) + +-- tcImports is a slight mis-nomer. +-- It deals with everythign that could be an import: +-- type and class decls +-- interface signatures +-- instance decls +-- rule decls +-- These can occur in source code too, of course + +tcImports pcs hst get_fixity this_mod decls + = fixTc (\ ~(unf_env, _, _, _, _) -> + -- (unf_env :: RecTcEnv) is used for type-checking interface pragmas + -- which is done lazily [ie failure just drops the pragma + -- without having any global-failure effect]. + -- + -- unf_env is also used to get the pragama info + -- for imported dfuns and default methods + +-- traceTc (text "Tc1") `thenNF_Tc_` + tcTyAndClassDecls unf_env tycl_decls `thenTc` \ env -> + tcSetEnv env $ + + -- Typecheck the instance decls, includes deriving +-- traceTc (text "Tc2") `thenNF_Tc_` + tcInstDecls1 (pcs_insts pcs) (pcs_PRS pcs) + hst unf_env get_fixity this_mod + decls `thenTc` \ (new_pcs_insts, inst_env, local_inst_info, deriv_binds) -> + tcSetInstEnv inst_env $ + + -- Interface type signatures + -- We tie a knot so that the Ids read out of interfaces are in scope + -- when we read their pragmas. + -- What we rely on is that pragmas are typechecked lazily; if + -- any type errors are found (ie there's an inconsistency) + -- we silently discard the pragma +-- traceTc (text "Tc3") `thenNF_Tc_` + tcInterfaceSigs unf_env tycl_decls `thenTc` \ sig_ids -> + tcExtendGlobalValEnv sig_ids $ + + + tcIfaceRules (pcs_rules pcs) this_mod iface_rules `thenNF_Tc` \ (new_pcs_rules, local_rules) -> + + tcGetEnv `thenTc` \ unf_env -> + let + all_things = nameEnvElts (getTcGEnv unf_env) + + -- sometimes we're compiling in the context of a package module + -- (on the GHCi command line, for example). In this case, we + -- want to treat everything we pulled in as an imported thing. + imported_things + | isHomeModule this_mod + = filter (not . isLocalThing this_mod) all_things + | otherwise + = all_things + + new_pte :: PackageTypeEnv + new_pte = extendTypeEnvList (pcs_PTE pcs) imported_things + + new_pcs :: PersistentCompilerState + new_pcs = pcs { pcs_PTE = new_pte, + pcs_insts = new_pcs_insts, + pcs_rules = new_pcs_rules + } + in + returnTc (unf_env, new_pcs, local_inst_info, deriv_binds, local_rules) + ) + where + tycl_decls = [d | TyClD d <- decls] + iface_rules = [d | RuleD d <- decls, isIfaceRuleDecl d] +\end{code} + +%************************************************************************ +%* * +\subsection{Checking the type of main} +%* * +%************************************************************************ + +We must check that in module Main, + a) main is defined + b) main :: forall a1...an. IO t, for some type t + +If we have + main = error "Urk" +then the type of main will be + main :: forall a. a +and that should pass the test too. + +So we just instantiate the type and unify with IO t, and declare +victory if doing so succeeds. + +\begin{code} +tcCheckMain :: Module -> TcM () +tcCheckMain this_mod + | not (moduleName this_mod == mAIN_Name ) + = returnTc () + + | otherwise + = -- First unify the main_id with IO t, for any old t + tcLookup_maybe mainName `thenNF_Tc` \ maybe_thing -> + case maybe_thing of + Just (ATcId main_id) -> check_main_ty (idType main_id) + other -> addErrTc noMainErr + where + check_main_ty main_ty + = tcInstType main_ty `thenNF_Tc` \ (tvs, theta, main_tau) -> + newTyVarTy liftedTypeKind `thenNF_Tc` \ arg_ty -> + tcLookupTyCon ioTyConName `thenNF_Tc` \ ioTyCon -> + tcAddErrCtxtM (mainTypeCtxt main_ty) $ + if not (null theta) then + failWithTc empty -- Context has the error message + else + unifyTauTy main_tau (mkTyConApp ioTyCon [arg_ty]) + +mainTypeCtxt main_ty tidy_env + = zonkTcType main_ty `thenNF_Tc` \ main_ty' -> + returnNF_Tc (tidy_env, ptext SLIT("`main' has the illegal type") <+> + quotes (ppr (tidyType tidy_env main_ty'))) + +noMainErr = hsep [ptext SLIT("Module") <+> quotes (ppr mAIN_Name), + ptext SLIT("must include a definition for") <+> quotes (ptext SLIT("main"))] +\end{code} + %************************************************************************ %* * @@ -268,7 +439,7 @@ get_binds decls = foldr ThenBinds EmptyBinds [binds | ValD binds <- decls] \begin{code} printTcDump dflags Nothing = return () -printTcDump dflags (Just results) +printTcDump dflags (Just (_, results)) = do dumpIfSet_dyn dflags Opt_D_dump_types "Type signatures" (dump_sigs results) dumpIfSet_dyn dflags Opt_D_dump_tc @@ -284,19 +455,23 @@ dump_sigs results -- Print type signatures = -- Convert to HsType so that we get source-language style printing -- And sort by RdrName vcat $ map ppr_sig $ sortLt lt_sig $ - [(toRdrName id, toHsType (idType id)) - | AnId id <- nameEnvElts (tc_env results), - want_sig id + [ (toRdrName id, toHsType (idType id)) + | AnId id <- nameEnvElts (tc_env results), + want_sig id ] where lt_sig (n1,_) (n2,_) = n1 < n2 ppr_sig (n,t) = ppr n <+> dcolon <+> ppr t want_sig id | opt_PprStyle_Debug = True - | otherwise = isLocallyDefined id + | otherwise = isLocalId id && isGlobalName (idName id) + -- isLocalId ignores data constructors, records selectors etc + -- The isGlobalName ignores local dictionary and method bindings + -- that the type checker has invented. User-defined things have + -- Global names. ppr_gen_tycons tcs = vcat [ptext SLIT("{-# Generic type constructor details"), - vcat (map ppr_gen_tycon (filter isLocallyDefined tcs)), + vcat (map ppr_gen_tycon tcs), ptext SLIT("#-}") ]