zonkInst, instToId, instToIdBndr,
- InstOrigin(..), pprOrigin
+ InstOrigin(..), InstLoc, pprInstLoc
) where
#include "HsVersions.h"
pprInstsInFull insts
= vcat (map go insts)
where
- go inst = quotes (ppr inst) <+> pprOrigin inst
+ go inst = quotes (ppr inst) <+> pprInstLoc (instLoc inst)
\end{code}
%************************************************************************
Unique
Class -- The type of the dict is (c ts), where
[TcType] -- c is the class and ts the types;
- InstOrigin
- SrcLoc
+ InstLoc
| Method
Unique
TcTauType -- The type of the method
- InstOrigin
- SrcLoc
+ InstLoc
-- INVARIANT: in (Method u f tys theta tau loc)
-- type of (f tys dicts(from theta)) = tau
Unique
OverloadedLit
TcType -- The type at which the literal is used
- InstOrigin -- Always a literal; but more convenient to carry this around
- SrcLoc
+ InstLoc
data OverloadedLit
= OverloadedIntegral Integer -- The number
EQ -> True
other -> False
-cmpInst (Dict _ clas1 tys1 _ _) (Dict _ clas2 tys2 _ _)
+cmpInst (Dict _ clas1 tys1 _) (Dict _ clas2 tys2 _)
= (clas1 `compare` clas2) `thenCmp` (tys1 `compare` tys2)
-cmpInst (Dict _ _ _ _ _) other
+cmpInst (Dict _ _ _ _) other
= LT
-cmpInst (Method _ _ _ _ _ _ _) (Dict _ _ _ _ _)
+cmpInst (Method _ _ _ _ _ _) (Dict _ _ _ _)
= GT
-cmpInst (Method _ id1 tys1 _ _ _ _) (Method _ id2 tys2 _ _ _ _)
+cmpInst (Method _ id1 tys1 _ _ _) (Method _ id2 tys2 _ _ _)
= (id1 `compare` id2) `thenCmp` (tys1 `compare` tys2)
-cmpInst (Method _ _ _ _ _ _ _) other
+cmpInst (Method _ _ _ _ _ _) other
= LT
-cmpInst (LitInst _ lit1 ty1 _ _) (LitInst _ lit2 ty2 _ _)
+cmpInst (LitInst _ lit1 ty1 _) (LitInst _ lit2 ty2 _)
= (lit1 `cmpOverLit` lit2) `thenCmp` (ty1 `compare` ty2)
-cmpInst (LitInst _ _ _ _ _) other
+cmpInst (LitInst _ _ _ _) other
= GT
cmpOverLit (OverloadedIntegral i1) (OverloadedIntegral i2) = i1 `compare` i2
Selection
~~~~~~~~~
\begin{code}
-instOrigin (Dict u clas tys origin loc) = origin
-instOrigin (Method u clas ty _ _ origin loc) = origin
-instOrigin (LitInst u lit ty origin loc) = origin
+instLoc (Dict u clas tys loc) = loc
+instLoc (Method u _ _ _ _ loc) = loc
+instLoc (LitInst u lit ty loc) = loc
-instLoc (Dict u clas tys origin loc) = loc
-instLoc (Method u clas ty _ _ origin loc) = loc
-instLoc (LitInst u lit ty origin loc) = loc
-
-getDictClassTys (Dict u clas tys _ _) = (clas, tys)
+getDictClassTys (Dict u clas tys _) = (clas, tys)
tyVarsOfInst :: Inst -> TcTyVarSet
-tyVarsOfInst (Dict _ _ tys _ _) = tyVarsOfTypes tys
-tyVarsOfInst (Method _ id tys _ _ _ _) = tyVarsOfTypes tys `unionVarSet` idFreeTyVars id
+tyVarsOfInst (Dict _ _ tys _) = tyVarsOfTypes tys
+tyVarsOfInst (Method _ id tys _ _ _) = tyVarsOfTypes tys `unionVarSet` idFreeTyVars id
-- The id might have free type variables; in the case of
-- locally-overloaded class methods, for example
-tyVarsOfInst (LitInst _ _ ty _ _) = tyVarsOfType ty
+tyVarsOfInst (LitInst _ _ ty _) = tyVarsOfType ty
\end{code}
Predicates
~~~~~~~~~~
\begin{code}
isDict :: Inst -> Bool
-isDict (Dict _ _ _ _ _) = True
-isDict other = False
+isDict (Dict _ _ _ _) = True
+isDict other = False
isMethodFor :: TcIdSet -> Inst -> Bool
-isMethodFor ids (Method uniq id tys _ _ orig loc)
+isMethodFor ids (Method uniq id tys _ _ loc)
= id `elemVarSet` ids
isMethodFor ids inst
= False
isTyVarDict :: Inst -> Bool
-isTyVarDict (Dict _ _ tys _ _) = all isTyVarTy tys
-isTyVarDict other = False
+isTyVarDict (Dict _ _ tys _) = all isTyVarTy tys
+isTyVarDict other = False
-isStdClassTyVarDict (Dict _ clas [ty] _ _) = isStandardClass clas && isTyVarTy ty
-isStdClassTyVarDict other = False
+isStdClassTyVarDict (Dict _ clas [ty] _) = isStandardClass clas && isTyVarTy ty
+isStdClassTyVarDict other = False
\end{code}
Two predicates which deal with the case where class constraints don't
\begin{code}
instBindingRequired :: Inst -> Bool
-instBindingRequired (Dict _ clas _ _ _) = not (isNoDictClass clas)
-instBindingRequired other = True
+instBindingRequired (Dict _ clas _ _) = not (isNoDictClass clas)
+instBindingRequired other = True
instCanBeGeneralised :: Inst -> Bool
-instCanBeGeneralised (Dict _ clas _ _ _) = not (isCcallishClass clas)
-instCanBeGeneralised other = True
+instCanBeGeneralised (Dict _ clas _ _) = not (isCcallishClass clas)
+instCanBeGeneralised other = True
\end{code}
-> TcThetaType
-> NF_TcM s (LIE, [TcId])
newDicts orig theta
- = tcGetSrcLoc `thenNF_Tc` \ loc ->
- newDictsAtLoc orig loc theta `thenNF_Tc` \ (dicts, ids) ->
+ = tcGetInstLoc orig `thenNF_Tc` \ loc ->
+ newDictsAtLoc loc theta `thenNF_Tc` \ (dicts, ids) ->
returnNF_Tc (listToBag dicts, ids)
-- Local function, similar to newDicts,
-- but with slightly different interface
-newDictsAtLoc :: InstOrigin
- -> SrcLoc
+newDictsAtLoc :: InstLoc
-> TcThetaType
-> NF_TcM s ([Inst], [TcId])
-newDictsAtLoc orig loc theta =
+newDictsAtLoc loc theta =
tcGetUniques (length theta) `thenNF_Tc` \ new_uniqs ->
let
- mk_dict u (clas, tys) = Dict u clas tys orig loc
+ mk_dict u (clas, tys) = Dict u clas tys loc
dicts = zipWithEqual "newDictsAtLoc" mk_dict new_uniqs theta
in
returnNF_Tc (dicts, map instToId dicts)
newDictFromOld :: Inst -> Class -> [TcType] -> NF_TcM s Inst
-newDictFromOld (Dict _ _ _ orig loc) clas tys
+newDictFromOld (Dict _ _ _ loc) clas tys
= tcGetUnique `thenNF_Tc` \ uniq ->
- returnNF_Tc (Dict uniq clas tys orig loc)
+ returnNF_Tc (Dict uniq clas tys loc)
newMethod :: InstOrigin
returnNF_Tc (HsVar (instToId inst), unitLIE inst)
newMethodWithGivenTy orig id tys theta tau
- = tcGetSrcLoc `thenNF_Tc` \ loc ->
+ = tcGetInstLoc orig `thenNF_Tc` \ loc ->
tcGetUnique `thenNF_Tc` \ new_uniq ->
let
- meth_inst = Method new_uniq id tys theta tau orig loc
+ meth_inst = Method new_uniq id tys theta tau loc
in
returnNF_Tc meth_inst
-newMethodAtLoc :: InstOrigin -> SrcLoc
+newMethodAtLoc :: InstLoc
-> Id -> [TcType]
-> NF_TcM s (Inst, TcId)
-newMethodAtLoc orig loc real_id tys -- Local function, similar to newMethod but with
+newMethodAtLoc loc real_id tys -- Local function, similar to newMethod but with
-- slightly different interface
= -- Get the Id type and instantiate it at the specified types
tcGetUnique `thenNF_Tc` \ new_uniq ->
rho_ty = ASSERT( length tyvars == length tys )
substTy (mkTopTyVarSubst tyvars tys) rho
(theta, tau) = splitRhoTy rho_ty
- meth_inst = Method new_uniq real_id tys theta tau orig loc
+ meth_inst = Method new_uniq real_id tys theta tau loc
in
returnNF_Tc (meth_inst, instToId meth_inst)
\end{code}
int_lit = HsCon intDataCon [] [intprim_lit]
newOverloadedLit orig lit ty -- The general case
- = tcGetSrcLoc `thenNF_Tc` \ loc ->
+ = tcGetInstLoc orig `thenNF_Tc` \ loc ->
tcGetUnique `thenNF_Tc` \ new_uniq ->
let
- lit_inst = LitInst new_uniq lit ty orig loc
+ lit_inst = LitInst new_uniq lit ty loc
in
returnNF_Tc (HsVar (instToId lit_inst), unitLIE lit_inst)
\end{code}
instToId inst = instToIdBndr inst
instToIdBndr :: Inst -> TcId
-instToIdBndr (Dict u clas ty orig loc)
+instToIdBndr (Dict u clas ty (_,loc,_))
= mkUserLocal (mkDictOcc (getOccName clas)) u (mkDictTy clas ty) loc
-instToIdBndr (Method u id tys theta tau orig loc)
+instToIdBndr (Method u id tys theta tau (_,loc,_))
= mkUserLocal (mkMethodOcc (getOccName id)) u tau loc
-instToIdBndr (LitInst u list ty orig loc)
+instToIdBndr (LitInst u list ty loc)
= mkSysLocal SLIT("lit") u ty
\end{code}
\begin{code}
zonkInst :: Inst -> NF_TcM s Inst
-zonkInst (Dict u clas tys orig loc)
+zonkInst (Dict u clas tys loc)
= zonkTcTypes tys `thenNF_Tc` \ new_tys ->
- returnNF_Tc (Dict u clas new_tys orig loc)
+ returnNF_Tc (Dict u clas new_tys loc)
-zonkInst (Method u id tys theta tau orig loc)
+zonkInst (Method u id tys theta tau loc)
= zonkId id `thenNF_Tc` \ new_id ->
-- Essential to zonk the id in case it's a local variable
-- Can't use zonkIdOcc because the id might itself be
zonkTcTypes tys `thenNF_Tc` \ new_tys ->
zonkTcThetaType theta `thenNF_Tc` \ new_theta ->
zonkTcType tau `thenNF_Tc` \ new_tau ->
- returnNF_Tc (Method u new_id new_tys new_theta new_tau orig loc)
+ returnNF_Tc (Method u new_id new_tys new_theta new_tau loc)
-zonkInst (LitInst u lit ty orig loc)
+zonkInst (LitInst u lit ty loc)
= zonkTcType ty `thenNF_Tc` \ new_ty ->
- returnNF_Tc (LitInst u lit new_ty orig loc)
+ returnNF_Tc (LitInst u lit new_ty loc)
\end{code}
instance Outputable Inst where
ppr inst = pprInst inst
-pprInst (LitInst u lit ty orig loc)
+pprInst (LitInst u lit ty loc)
= hsep [case lit of
OverloadedIntegral i -> integer i
OverloadedFractional f -> rational f,
ppr ty,
show_uniq u]
-pprInst (Dict u clas tys orig loc) = pprConstraint clas tys <+> show_uniq u
+pprInst (Dict u clas tys loc) = pprConstraint clas tys <+> show_uniq u
-pprInst (Method u id tys _ _ orig loc)
+pprInst (Method u id tys _ _ loc)
= hsep [ppr id, ptext SLIT("at"),
brackets (interppSP tys),
show_uniq u]
tidyInst :: TidyEnv -> Inst -> (TidyEnv, Inst)
-tidyInst env (LitInst u lit ty orig loc)
- = (env', LitInst u lit ty' orig loc)
+tidyInst env (LitInst u lit ty loc)
+ = (env', LitInst u lit ty' loc)
where
(env', ty') = tidyOpenType env ty
-tidyInst env (Dict u clas tys orig loc)
- = (env', Dict u clas tys' orig loc)
+tidyInst env (Dict u clas tys loc)
+ = (env', Dict u clas tys' loc)
where
(env', tys') = tidyOpenTypes env tys
-tidyInst env (Method u id tys theta tau orig loc)
- = (env', Method u id tys' theta tau orig loc)
+tidyInst env (Method u id tys theta tau loc)
+ = (env', Method u id tys' theta tau loc)
-- Leave theta, tau alone cos we don't print them
where
(env', tys') = tidyOpenTypes env tys
-- Dictionaries
-lookupInst dict@(Dict _ clas tys orig loc)
+lookupInst dict@(Dict _ clas tys loc)
= case lookupInstEnv (ppr clas) (classInstEnv clas) tys of
Just (tenv, dfun_id)
if null theta then
returnNF_Tc (SimpleInst ty_app)
else
- newDictsAtLoc orig loc theta `thenNF_Tc` \ (dicts, dict_ids) ->
+ newDictsAtLoc loc theta `thenNF_Tc` \ (dicts, dict_ids) ->
let
rhs = mkHsDictApp ty_app dict_ids
in
-- Methods
-lookupInst inst@(Method _ id tys theta _ orig loc)
- = newDictsAtLoc orig loc theta `thenNF_Tc` \ (dicts, dict_ids) ->
+lookupInst inst@(Method _ id tys theta _ loc)
+ = newDictsAtLoc loc theta `thenNF_Tc` \ (dicts, dict_ids) ->
returnNF_Tc (GenInst dicts (mkHsDictApp (mkHsTyApp (HsVar id) tys) dict_ids))
-- Literals
-lookupInst inst@(LitInst u (OverloadedIntegral i) ty orig loc)
+lookupInst inst@(LitInst u (OverloadedIntegral i) ty loc)
| isIntTy ty && in_int_range -- Short cut for Int
= returnNF_Tc (GenInst [] int_lit)
-- GenInst, not SimpleInst, because int_lit is actually a constructor application
| in_int_range -- It's overloaded but small enough to fit into an Int
= tcLookupValueByKey fromIntClassOpKey `thenNF_Tc` \ from_int ->
- newMethodAtLoc orig loc from_int [ty] `thenNF_Tc` \ (method_inst, method_id) ->
+ newMethodAtLoc loc from_int [ty] `thenNF_Tc` \ (method_inst, method_id) ->
returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) int_lit))
| otherwise -- Alas, it is overloaded and a big literal!
= tcLookupValueByKey fromIntegerClassOpKey `thenNF_Tc` \ from_integer ->
- newMethodAtLoc orig loc from_integer [ty] `thenNF_Tc` \ (method_inst, method_id) ->
+ newMethodAtLoc loc from_integer [ty] `thenNF_Tc` \ (method_inst, method_id) ->
returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) integer_lit))
where
in_int_range = inIntRange i
-- *definitely* a float or a double, generate the real thing here.
-- This is essential (see nofib/spectral/nucleic).
-lookupInst inst@(LitInst u (OverloadedFractional f) ty orig loc)
+lookupInst inst@(LitInst u (OverloadedFractional f) ty loc)
| isFloatTy ty = returnNF_Tc (GenInst [] float_lit)
| isDoubleTy ty = returnNF_Tc (GenInst [] double_lit)
rational_ty = mkSynTy rational_tycon []
rational_lit = HsLitOut (HsFrac f) rational_ty
in
- newMethodAtLoc orig loc from_rational [ty] `thenNF_Tc` \ (method_inst, method_id) ->
+ newMethodAtLoc loc from_rational [ty] `thenNF_Tc` \ (method_inst, method_id) ->
returnNF_Tc (GenInst [method_inst] (HsApp (HsVar method_id) rational_lit))
where
where
(_, theta, _) = splitSigmaTy (idType dfun)
\end{code}
-
-
-
-%************************************************************************
-%* *
-\subsection[Inst-origin]{The @InstOrigin@ type}
-%* *
-%************************************************************************
-
-The @InstOrigin@ type gives information about where a dictionary came from.
-This is important for decent error message reporting because dictionaries
-don't appear in the original source code. Doubtless this type will evolve...
-
-\begin{code}
-data InstOrigin
- = OccurrenceOf TcId -- Occurrence of an overloaded identifier
- | OccurrenceOfCon Id -- Occurrence of a data constructor
-
- | RecordUpdOrigin
-
- | DataDeclOrigin -- Typechecking a data declaration
-
- | InstanceDeclOrigin -- Typechecking an instance decl
-
- | LiteralOrigin HsLit -- Occurrence of a literal
-
- | PatOrigin RenamedPat
-
- | ArithSeqOrigin RenamedArithSeqInfo -- [x..], [x..y] etc
-
- | SignatureOrigin -- A dict created from a type signature
- | Rank2Origin -- A dict created when typechecking the argument
- -- of a rank-2 typed function
-
- | DoOrigin -- The monad for a do expression
-
- | ClassDeclOrigin -- Manufactured during a class decl
-
- | InstanceSpecOrigin Class -- in a SPECIALIZE instance pragma
- Type
-
- -- When specialising instances the instance info attached to
- -- each class is not yet ready, so we record it inside the
- -- origin information. This is a bit of a hack, but it works
- -- fine. (Patrick is to blame [WDP].)
-
- | ValSpecOrigin Name -- in a SPECIALIZE pragma for a value
-
- -- Argument or result of a ccall
- -- Dictionaries with this origin aren't actually mentioned in the
- -- translated term, and so need not be bound. Nor should they
- -- be abstracted over.
-
- | CCallOrigin String -- CCall label
- (Maybe RenamedHsExpr) -- Nothing if it's the result
- -- Just arg, for an argument
-
- | LitLitOrigin String -- the litlit
-
- | UnknownOrigin -- Help! I give up...
-\end{code}
-
-\begin{code}
-pprOrigin :: Inst -> SDoc
-pprOrigin inst
- = hsep [text "arising from", pp_orig orig, text "at", ppr locn]
- where
- (orig, locn) = case inst of
- Dict _ _ _ orig loc -> (orig,loc)
- Method _ _ _ _ _ orig loc -> (orig,loc)
- LitInst _ _ _ orig loc -> (orig,loc)
-
- pp_orig (OccurrenceOf id)
- = hsep [ptext SLIT("use of"), quotes (ppr id)]
- pp_orig (OccurrenceOfCon id)
- = hsep [ptext SLIT("use of"), quotes (ppr id)]
- pp_orig (LiteralOrigin lit)
- = hsep [ptext SLIT("the literal"), quotes (ppr lit)]
- pp_orig (PatOrigin pat)
- = hsep [ptext SLIT("the pattern"), quotes (ppr pat)]
- pp_orig (InstanceDeclOrigin)
- = ptext SLIT("an instance declaration")
- pp_orig (ArithSeqOrigin seq)
- = hsep [ptext SLIT("the arithmetic sequence"), quotes (ppr seq)]
- pp_orig (SignatureOrigin)
- = ptext SLIT("a type signature")
- pp_orig (Rank2Origin)
- = ptext SLIT("a function with an overloaded argument type")
- pp_orig (DoOrigin)
- = ptext SLIT("a do statement")
- pp_orig (ClassDeclOrigin)
- = ptext SLIT("a class declaration")
- pp_orig (InstanceSpecOrigin clas ty)
- = hsep [text "a SPECIALIZE instance pragma; class",
- quotes (ppr clas), text "type:", ppr ty]
- pp_orig (ValSpecOrigin name)
- = hsep [ptext SLIT("a SPECIALIZE user-pragma for"), quotes (ppr name)]
- pp_orig (CCallOrigin clabel Nothing{-ccall result-})
- = hsep [ptext SLIT("the result of the _ccall_ to"), quotes (text clabel)]
- pp_orig (CCallOrigin clabel (Just arg_expr))
- = hsep [ptext SLIT("an argument in the _ccall_ to"), quotes (text clabel) <> comma,
- text "namely", quotes (ppr arg_expr)]
- pp_orig (LitLitOrigin s)
- = hsep [ptext SLIT("the ``literal-literal''"), quotes (text s)]
- pp_orig (UnknownOrigin)
- = ptext SLIT("...oops -- I don't know where the overloading came from!")
-\end{code}
checkTc, checkTcM, checkMaybeTc, checkMaybeTcM,
failTc, failWithTc, addErrTc, warnTc, recoverTc, checkNoErrsTc, recoverNF_Tc, discardErrsTc,
- addErrTcM, failWithTcM,
+ addErrTcM, addInstErrTcM, failWithTcM,
tcGetEnv, tcSetEnv,
tcGetDefaultTys, tcSetDefaultTys,
tcGetUnique, tcGetUniques,
- tcAddSrcLoc, tcGetSrcLoc,
+ tcAddSrcLoc, tcGetSrcLoc, tcGetInstLoc,
tcAddErrCtxtM, tcSetErrCtxtM,
tcAddErrCtxt, tcSetErrCtxt,
tcNewMutVar, tcNewSigTyVar, tcReadMutVar, tcWriteMutVar, TcRef,
tcNewMutTyVar, tcReadMutTyVar, tcWriteMutTyVar,
+ InstOrigin(..), InstLoc, pprInstLoc,
+
TcError, TcWarning, TidyEnv, emptyTidyEnv,
arityErr
) where
import {-# SOURCE #-} TcEnv ( TcEnv )
+import HsSyn ( HsLit )
+import RnHsSyn ( RenamedPat, RenamedArithSeqInfo, RenamedHsExpr )
import Type ( Type, Kind, ThetaType, RhoType, TauType,
)
-import ErrUtils ( addShortErrLocLine, addShortWarnLocLine, ErrMsg, Message, WarnMsg )
+import ErrUtils ( addShortErrLocLine, addShortWarnLocLine, pprBagOfErrors, ErrMsg, Message, WarnMsg )
import CmdLineOpts ( opt_PprStyle_Debug )
import Bag ( Bag, emptyBag, isEmptyBag,
foldBag, unitBag, unionBags, snocBag )
import Class ( Class )
import Name ( Name )
-import Var ( TyVar, newMutTyVar, newSigTyVar, readMutTyVar, writeMutTyVar )
+import Var ( Id, TyVar, newMutTyVar, newSigTyVar, readMutTyVar, writeMutTyVar )
import VarEnv ( TyVarEnv, emptyVarEnv, TidyEnv, emptyTidyEnv )
import VarSet ( TyVarSet )
import UniqSupply ( UniqSupply, uniqFromSupply, uniqsFromSupply, splitUniqSupply,
addErrTcM :: (TidyEnv, Message) -> NF_TcM s () -- Add an error message but don't fail
addErrTcM (tidy_env, err_msg) down env
+ = add_err_tcm tidy_env err_msg ctxt loc down env
+ where
+ ctxt = getErrCtxt down
+ loc = getLoc down
+
+addInstErrTcM :: InstLoc -> (TidyEnv, Message) -> NF_TcM s () -- Add an error message but don't fail
+addInstErrTcM inst_loc@(_, loc, ctxt) (tidy_env, err_msg) down env
+ = add_err_tcm tidy_env err_msg full_ctxt loc down env
+ where
+ full_ctxt = (\env -> returnNF_Tc (env, pprInstLoc inst_loc)) : ctxt
+
+add_err_tcm tidy_env err_msg ctxt loc down env
= do
(warns, errs) <- readIORef errs_var
ctxt_msgs <- do_ctxt tidy_env ctxt down env
writeIORef errs_var (warns, errs `snocBag` err)
where
errs_var = getTcErrs down
- ctxt = getErrCtxt down
- loc = getLoc down
do_ctxt tidy_env [] down env
= return []
tcGetSrcLoc :: NF_TcM s SrcLoc
tcGetSrcLoc down env = return (getLoc down)
+tcGetInstLoc :: InstOrigin -> NF_TcM s InstLoc
+tcGetInstLoc origin down env = return (origin, getLoc down, getErrCtxt down)
+
tcSetErrCtxtM, tcAddErrCtxtM :: (TidyEnv -> NF_TcM s (TidyEnv, Message))
-> TcM s a -> TcM s a
tcSetErrCtxtM msg m down env = m (setErrCtxt down msg) env
\end{code}
+
+%************************************************************************
+%* *
+\subsection[Inst-origin]{The @InstOrigin@ type}
+%* *
+%************************************************************************
+
+The @InstOrigin@ type gives information about where a dictionary came from.
+This is important for decent error message reporting because dictionaries
+don't appear in the original source code. Doubtless this type will evolve...
+
+It appears in TcMonad because there are a couple of error-message-generation
+functions that deal with it.
+
+\begin{code}
+type InstLoc = (InstOrigin, SrcLoc, ErrCtxt)
+
+data InstOrigin
+ = OccurrenceOf Id -- Occurrence of an overloaded identifier
+
+ | RecordUpdOrigin
+
+ | DataDeclOrigin -- Typechecking a data declaration
+
+ | InstanceDeclOrigin -- Typechecking an instance decl
+
+ | LiteralOrigin HsLit -- Occurrence of a literal
+
+ | PatOrigin RenamedPat
+
+ | ArithSeqOrigin RenamedArithSeqInfo -- [x..], [x..y] etc
+
+ | SignatureOrigin -- A dict created from a type signature
+ | Rank2Origin -- A dict created when typechecking the argument
+ -- of a rank-2 typed function
+
+ | DoOrigin -- The monad for a do expression
+
+ | ClassDeclOrigin -- Manufactured during a class decl
+
+ | InstanceSpecOrigin Class -- in a SPECIALIZE instance pragma
+ Type
+
+ -- When specialising instances the instance info attached to
+ -- each class is not yet ready, so we record it inside the
+ -- origin information. This is a bit of a hack, but it works
+ -- fine. (Patrick is to blame [WDP].)
+
+ | ValSpecOrigin Name -- in a SPECIALIZE pragma for a value
+
+ -- Argument or result of a ccall
+ -- Dictionaries with this origin aren't actually mentioned in the
+ -- translated term, and so need not be bound. Nor should they
+ -- be abstracted over.
+
+ | CCallOrigin String -- CCall label
+ (Maybe RenamedHsExpr) -- Nothing if it's the result
+ -- Just arg, for an argument
+
+ | LitLitOrigin String -- the litlit
+
+ | UnknownOrigin -- Help! I give up...
+\end{code}
+
+\begin{code}
+pprInstLoc :: InstLoc -> SDoc
+pprInstLoc (orig, locn, ctxt)
+ = hsep [text "arising from", pp_orig orig, text "at", ppr locn]
+ where
+ pp_orig (OccurrenceOf id)
+ = hsep [ptext SLIT("use of"), quotes (ppr id)]
+ pp_orig (LiteralOrigin lit)
+ = hsep [ptext SLIT("the literal"), quotes (ppr lit)]
+ pp_orig (PatOrigin pat)
+ = hsep [ptext SLIT("the pattern"), quotes (ppr pat)]
+ pp_orig (InstanceDeclOrigin)
+ = ptext SLIT("an instance declaration")
+ pp_orig (ArithSeqOrigin seq)
+ = hsep [ptext SLIT("the arithmetic sequence"), quotes (ppr seq)]
+ pp_orig (SignatureOrigin)
+ = ptext SLIT("a type signature")
+ pp_orig (Rank2Origin)
+ = ptext SLIT("a function with an overloaded argument type")
+ pp_orig (DoOrigin)
+ = ptext SLIT("a do statement")
+ pp_orig (ClassDeclOrigin)
+ = ptext SLIT("a class declaration")
+ pp_orig (InstanceSpecOrigin clas ty)
+ = hsep [text "a SPECIALIZE instance pragma; class",
+ quotes (ppr clas), text "type:", ppr ty]
+ pp_orig (ValSpecOrigin name)
+ = hsep [ptext SLIT("a SPECIALIZE user-pragma for"), quotes (ppr name)]
+ pp_orig (CCallOrigin clabel Nothing{-ccall result-})
+ = hsep [ptext SLIT("the result of the _ccall_ to"), quotes (text clabel)]
+ pp_orig (CCallOrigin clabel (Just arg_expr))
+ = hsep [ptext SLIT("an argument in the _ccall_ to"), quotes (text clabel) <> comma,
+ text "namely", quotes (ppr arg_expr)]
+ pp_orig (LitLitOrigin s)
+ = hsep [ptext SLIT("the ``literal-literal''"), quotes (text s)]
+ pp_orig (UnknownOrigin)
+ = ptext SLIT("...oops -- I don't know where the overloading came from!")
+\end{code}
isDict, isStdClassTyVarDict, isMethodFor,
instToId, instBindingRequired, instCanBeGeneralised,
newDictFromOld,
- instLoc, getDictClassTys,
- pprInst, zonkInst, tidyInst, tidyInsts,
+ getDictClassTys,
+ instLoc, pprInst, zonkInst, tidyInst, tidyInsts,
Inst, LIE, pprInsts, pprInstsInFull, mkLIE, emptyLIE,
- plusLIE, pprOrigin
+ plusLIE
)
import TcEnv ( tcGetGlobalTyVars )
import TcType ( TcType, TcTyVarSet, typeToTcType )
addAmbigErrs ambig_tv_fn dicts = mapNF_Tc (addAmbigErr ambig_tv_fn) dicts
addAmbigErr ambig_tv_fn dict
- = tcAddSrcLoc (instLoc dict) $
- addErrTcM (tidy_env,
- sep [text "Ambiguous type variable(s)" <+>
+ = addInstErrTcM (instLoc dict)
+ (tidy_env,
+ sep [text "Ambiguous type variable(s)" <+>
hsep (punctuate comma (map (quotes . ppr) ambig_tvs)),
- nest 4 (text "in the constraint" <+> quotes (pprInst tidy_dict)),
- nest 4 (pprOrigin dict)])
+ nest 4 (text "in the constraint" <+> quotes (pprInst tidy_dict))])
where
ambig_tvs = varSetElems (ambig_tv_fn tidy_dict)
(tidy_env, tidy_dict) = tidyInst emptyTidyEnv dict
= returnNF_Tc ()
| otherwise
- = tcAddSrcLoc (instLoc (head dicts)) $
- warnTc True msg
+ = warnTc True msg
where
msg | length dicts > 1
= (ptext SLIT("Defaulting the following constraint(s) to type") <+> quotes (ppr default_ty))
(_, tidy_dicts) = mapAccumL tidyInst emptyTidyEnv dicts
addRuleLhsErr dict
- = tcAddSrcLoc (instLoc dict) $
- addErrTcM (tidy_env,
- vcat [ptext SLIT("Could not deduce") <+> quotes (pprInst tidy_dict),
- nest 4 (pprOrigin dict),
- ptext SLIT("LHS of a rule must have no overloading")])
+ = addInstErrTcM (instLoc dict)
+ (tidy_env,
+ vcat [ptext SLIT("Could not deduce") <+> quotes (pprInst tidy_dict),
+ nest 4 (ptext SLIT("LHS of a rule must have no overloading"))])
where
(tidy_env, tidy_dict) = tidyInst emptyTidyEnv dict
-- Used for top-level irreducibles
addTopInstanceErr dict
- = tcAddSrcLoc (instLoc dict) $
- addErrTcM (tidy_env,
- sep [ptext SLIT("No instance for") <+> quotes (pprInst tidy_dict),
- nest 4 $ pprOrigin dict])
+ = addInstErrTcM (instLoc dict)
+ (tidy_env,
+ ptext SLIT("No instance for") <+> quotes (pprInst tidy_dict))
where
(tidy_env, tidy_dict) = tidyInst emptyTidyEnv dict
addNoInstanceErr str givens dict
- = tcAddSrcLoc (instLoc dict) $
- addErrTcM (tidy_env,
- sep [sep [ptext SLIT("Could not deduce") <+> quotes (pprInst tidy_dict),
- nest 4 $ parens $ pprOrigin dict],
- nest 4 $ ptext SLIT("from the context:") <+> pprInsts tidy_givens]
- $$
- ptext SLIT("Probable cause:") <+>
+ = addInstErrTcM (instLoc dict)
+ (tidy_env,
+ sep [ptext SLIT("Could not deduce") <+> quotes (pprInst tidy_dict),
+ nest 4 $ ptext SLIT("from the context:") <+> pprInsts tidy_givens]
+ $$
+ ptext SLIT("Probable cause:") <+>
vcat [sep [ptext SLIT("missing") <+> quotes (pprInst tidy_dict),
- ptext SLIT("in") <+> str],
+ ptext SLIT("in") <+> str],
if all_tyvars then empty else
ptext SLIT("or missing instance declaration for") <+> quotes (pprInst tidy_dict)]
)
projects / ghc-hetmet.git / commitdiff