import DataCon
import Class
import Var
+import Id
import MkId
import Name
import NameSet
\item
$alpha$ is the class variable
\item
-$LIE_cop' = LIE_cop [X gammas_bar / alpha, fresh betas_bar]$
+$LIE_cop' = LIE_cop [X gammas_bar \/ alpha, fresh betas_bar]$
\item
-$tau_cop' = tau_cop [X gammas_bar / alpha, fresh betas_bar]$
+$tau_cop' = tau_cop [X gammas_bar \/ alpha, fresh betas_bar]$
\end{enumerate}
ToDo: Update the list above with names actually in the code.
\begin{enumerate}
\item
First, make the LIEs for the class and instance contexts, which means
-instantiate $thetaC [X inst_tyvars / alpha ]$, yielding LIElistC' and LIEC',
+instantiate $thetaC [X inst_tyvars \/ alpha ]$, yielding LIElistC' and LIEC',
and make LIElistI and LIEI.
\item
Then process each method in turn.
-> [LInstDecl Name] -- Source code instance decls
-> [LDerivDecl Name] -- Source code stand-alone deriving decls
-> TcM (TcGblEnv, -- The full inst env
- [InstInfo], -- Source-code instance decls to process;
+ [InstInfo Name], -- Source-code instance decls to process;
-- contains all dfuns for this module
HsValBinds Name) -- Supporting bindings for derived instances
-- (1) Do class and family instance declarations
; let { idxty_decls = filter (isFamInstDecl . unLoc) tycl_decls }
- ; local_info_tycons <- mapM tcLocalInstDecl1 inst_decls
- ; idx_tycons <- mapM tcIdxTyInstDeclTL idxty_decls
+ ; local_info_tycons <- mapAndRecoverM tcLocalInstDecl1 inst_decls
+ ; idx_tycons <- mapAndRecoverM tcIdxTyInstDeclTL idxty_decls
- ; let { (local_infos,
- at_tycons) = unzip local_info_tycons
- ; local_info = concat local_infos
- ; at_idx_tycon = concat at_tycons ++ catMaybes idx_tycons
+ ; let { (local_info,
+ at_tycons_s) = unzip local_info_tycons
+ ; at_idx_tycon = concat at_tycons_s ++ idx_tycons
; clas_decls = filter (isClassDecl.unLoc) tycl_decls
; implicit_things = concatMap implicitTyThings at_idx_tycon
}
addErr $ assocInClassErr (tcdName decl)
; return tything
}
- isAssocFamily (Just (ATyCon tycon)) =
+ isAssocFamily (ATyCon tycon) =
case tyConFamInst_maybe tycon of
Nothing -> panic "isAssocFamily: no family?!?"
Just (fam, _) -> isTyConAssoc fam
- isAssocFamily (Just _ ) = panic "isAssocFamily: no tycon?!?"
- isAssocFamily Nothing = False
+ isAssocFamily _ = panic "isAssocFamily: no tycon?!?"
assocInClassErr :: Name -> SDoc
assocInClassErr name =
ptext (sLit "Associated type") <+> quotes (ppr name) <+>
ptext (sLit "must be inside a class instance")
-addInsts :: [InstInfo] -> TcM a -> TcM a
+addInsts :: [InstInfo Name] -> TcM a -> TcM a
addInsts infos thing_inside
= tcExtendLocalInstEnv (map iSpec infos) thing_inside
\begin{code}
tcLocalInstDecl1 :: LInstDecl Name
- -> TcM ([InstInfo], [TyThing]) -- [] if there was an error
+ -> TcM (InstInfo Name, [TyThing])
-- A source-file instance declaration
-- Type-check all the stuff before the "where"
--
-- We check for respectable instance type, and context
tcLocalInstDecl1 (L loc (InstDecl poly_ty binds uprags ats))
- = -- Prime error recovery, set source location
- recoverM (return ([], [])) $
- setSrcSpan loc $
+ = setSrcSpan loc $
addErrCtxt (instDeclCtxt1 poly_ty) $
do { is_boot <- tcIsHsBoot
; (tyvars, theta, tau) <- tcHsInstHead poly_ty
- -- Next, process any associated types.
- ; idx_tycons <- mapM tcFamInstDecl ats
-
-- Now, check the validity of the instance.
; (clas, inst_tys) <- checkValidInstHead tau
; checkValidInstance tyvars theta clas inst_tys
- ; checkValidAndMissingATs clas (tyvars, inst_tys)
- (zip ats idx_tycons)
+
+ -- Next, process any associated types.
+ ; idx_tycons <- recoverM (return []) $
+ do { idx_tycons <- checkNoErrs $ mapAndRecoverM tcFamInstDecl ats
+ ; checkValidAndMissingATs clas (tyvars, inst_tys)
+ (zip ats idx_tycons)
+ ; return idx_tycons }
-- Finally, construct the Core representation of the instance.
-- (This no longer includes the associated types.)
- ; dfun_name <- newDFunName clas inst_tys loc
+ ; dfun_name <- newDFunName clas inst_tys (getLoc poly_ty)
+ -- Dfun location is that of instance *header*
; overlap_flag <- getOverlapFlag
; let (eq_theta,dict_theta) = partition isEqPred theta
theta' = eq_theta ++ dict_theta
dfun = mkDictFunId dfun_name tyvars theta' clas inst_tys
ispec = mkLocalInstance dfun overlap_flag
- ; return ([InstInfo { iSpec = ispec,
- iBinds = VanillaInst binds uprags }],
- catMaybes idx_tycons)
+ ; return (InstInfo { iSpec = ispec,
+ iBinds = VanillaInst binds uprags },
+ idx_tycons)
}
where
-- We pass in the source form and the type checked form of the ATs. We
checkValidAndMissingATs :: Class
-> ([TyVar], [TcType]) -- instance types
-> [(LTyClDecl Name, -- source form of AT
- Maybe TyThing)] -- Core form of AT
+ TyThing)] -- Core form of AT
-> TcM ()
checkValidAndMissingATs clas inst_tys ats
= do { -- Issue a warning for each class AT that is not defined in this
; mapM_ (checkIndexes clas inst_tys) ats
}
- checkIndexes _ _ (_, Nothing) =
- return () -- skip, we already had an error here
- checkIndexes clas inst_tys (hsAT, Just (ATyCon tycon)) =
+ checkIndexes clas inst_tys (hsAT, ATyCon tycon) =
-- !!!TODO: check that this does the Right Thing for indexed synonyms, too!
checkIndexes' clas inst_tys hsAT
(tyConTyVars tycon,
%************************************************************************
\begin{code}
-tcInstDecls2 :: [LTyClDecl Name] -> [InstInfo]
+tcInstDecls2 :: [LTyClDecl Name] -> [InstInfo Name]
-> TcM (LHsBinds Id, TcLclEnv)
-- (a) From each class declaration,
-- generate any default-method bindings
\begin{code}
-tcInstDecl2 :: InstInfo -> TcM (LHsBinds Id)
+tcInstDecl2 :: InstInfo Name -> TcM (LHsBinds Id)
-- Returns a binding for the dfun
------------------------
dfun_id = instanceDFunId ispec
rigid_info = InstSkol
inst_ty = idType dfun_id
- loc = srcLocSpan (getSrcLoc dfun_id)
+ loc = getSrcSpan dfun_id
in
-- Prime error recovery
recoverM (return emptyLHsBinds) $
projects / ghc-hetmet.git / blobdiff