\begin{code}
tcBracket :: HsBracket Name -> BoxyRhoType -> TcM (LHsExpr TcId)
-tcBracket brack res_ty
- = getStage `thenM` \ level ->
- case bracketOK level of {
+tcBracket brack res_ty = do
+ level <- getStage
+ case bracketOK level of {
Nothing -> failWithTc (illegalBracket level) ;
- Just next_level ->
+ Just next_level -> do
-- Typecheck expr to make sure it is valid,
-- but throw away the results. We'll type check
-- it again when we actually use it.
- recordThUse `thenM_`
- newMutVar [] `thenM` \ pending_splices ->
- getLIEVar `thenM` \ lie_var ->
+ recordThUse
+ pending_splices <- newMutVar []
+ lie_var <- getLIEVar
- setStage (Brack next_level pending_splices lie_var) (
- getLIE (tc_bracket next_level brack)
- ) `thenM` \ (meta_ty, lie) ->
- tcSimplifyBracket lie `thenM_`
+ (meta_ty, lie) <- setStage (Brack next_level pending_splices lie_var)
+ (getLIE (tc_bracket next_level brack))
+ tcSimplifyBracket lie
-- Make the expected type have the right shape
- boxyUnify meta_ty res_ty `thenM_`
+ boxyUnify meta_ty res_ty
-- Return the original expression, not the type-decorated one
- readMutVar pending_splices `thenM` \ pendings ->
- returnM (noLoc (HsBracketOut brack pendings))
+ pendings <- readMutVar pending_splices
+ return (noLoc (HsBracketOut brack pendings))
}
tc_bracket :: ThLevel -> HsBracket Name -> TcM TcType
}
tc_bracket use_lvl (PatBr _)
- = failWithTc (ptext SLIT("Tempate Haskell pattern brackets are not supported yet"))
+ = failWithTc (ptext (sLit "Tempate Haskell pattern brackets are not supported yet"))
quotedNameStageErr v
- = sep [ ptext SLIT("Stage error: the non-top-level quoted name") <+> ppr (VarBr v)
- , ptext SLIT("must be used at the same stage at which is is bound")]
+ = sep [ ptext (sLit "Stage error: the non-top-level quoted name") <+> ppr (VarBr v)
+ , ptext (sLit "must be used at the same stage at which is is bound")]
\end{code}
\begin{code}
tcSpliceExpr (HsSplice name expr) res_ty
- = setSrcSpan (getLoc expr) $
- getStage `thenM` \ level ->
+ = setSrcSpan (getLoc expr) $ do
+ level <- getStage
case spliceOK level of {
Nothing -> failWithTc (illegalSplice level) ;
Just next_level ->
- case level of {
+ case level of {
Comp -> do { e <- tcTopSplice expr res_ty
- ; returnM (unLoc e) } ;
- Brack _ ps_var lie_var ->
+ ; return (unLoc e) } ;
+ Brack _ ps_var lie_var -> do
-- A splice inside brackets
-- NB: ignore res_ty, apart from zapping it to a mono-type
-- Here (h 4) :: Q Exp
-- but $(h 4) :: forall a.a i.e. anything!
- unBox res_ty `thenM_`
- tcMetaTy expQTyConName `thenM` \ meta_exp_ty ->
- setStage (Splice next_level) (
- setLIEVar lie_var $
- tcMonoExpr expr meta_exp_ty
- ) `thenM` \ expr' ->
+ unBox res_ty
+ meta_exp_ty <- tcMetaTy expQTyConName
+ expr' <- setStage (Splice next_level) (
+ setLIEVar lie_var $
+ tcMonoExpr expr meta_exp_ty
+ )
-- Write the pending splice into the bucket
- readMutVar ps_var `thenM` \ ps ->
- writeMutVar ps_var ((name,expr') : ps) `thenM_`
+ ps <- readMutVar ps_var
+ writeMutVar ps_var ((name,expr') : ps)
- returnM (panic "tcSpliceExpr") -- The returned expression is ignored
- }}
+ return (panic "tcSpliceExpr") -- The returned expression is ignored
+ }}
-- tcTopSplice used to have this:
-- Note that we do not decrement the level (to -1) before
-- inner escape before dealing with the outer one
tcTopSplice :: LHsExpr Name -> BoxyRhoType -> TcM (LHsExpr Id)
-tcTopSplice expr res_ty
- = tcMetaTy expQTyConName `thenM` \ meta_exp_ty ->
+tcTopSplice expr res_ty = do
+ meta_exp_ty <- tcMetaTy expQTyConName
- -- Typecheck the expression
- tcTopSpliceExpr expr meta_exp_ty `thenM` \ zonked_q_expr ->
+ -- Typecheck the expression
+ zonked_q_expr <- tcTopSpliceExpr expr meta_exp_ty
- -- Run the expression
- traceTc (text "About to run" <+> ppr zonked_q_expr) `thenM_`
- runMetaE convertToHsExpr zonked_q_expr `thenM` \ expr2 ->
-
- traceTc (text "Got result" <+> ppr expr2) `thenM_`
+ -- Run the expression
+ traceTc (text "About to run" <+> ppr zonked_q_expr)
+ expr2 <- runMetaE convertToHsExpr zonked_q_expr
+
+ traceTc (text "Got result" <+> ppr expr2)
showSplice "expression"
- zonked_q_expr (ppr expr2) `thenM_`
+ zonked_q_expr (ppr expr2)
- -- Rename it, but bale out if there are errors
- -- otherwise the type checker just gives more spurious errors
- checkNoErrs (rnLExpr expr2) `thenM` \ (exp3, fvs) ->
+ -- Rename it, but bale out if there are errors
+ -- otherwise the type checker just gives more spurious errors
+ (exp3, fvs) <- checkNoErrs (rnLExpr expr2)
tcMonoExpr exp3 res_ty
= runQuasiQuote quasiquote quotePatName "pattern" patQTyConName convertToPat
quoteStageError quoter
- = sep [ptext SLIT("GHC stage restriction:") <+> ppr quoter,
- nest 2 (ptext SLIT("is used in a quasiquote, and must be imported, not defined locally"))]
+ = sep [ptext (sLit "GHC stage restriction:") <+> ppr quoter,
+ nest 2 (ptext (sLit "is used in a quasiquote, and must be imported, not defined locally"))]
\end{code}
-- Here (h 4) :: Q Type
-- but $(h 4) :: forall a.a i.e. any kind
; kind <- newKindVar
- ; returnM (panic "kcSpliceType", kind) -- The returned type is ignored
+ ; return (panic "kcSpliceType", kind) -- The returned type is ignored
}}}}}
kcTopSpliceType :: LHsExpr Name -> TcM (LHsType Name, TcKind)
-- Rename it, but bale out if there are errors
-- otherwise the type checker just gives more spurious errors
- ; let doc = ptext SLIT("In the spliced type") <+> ppr hs_ty2
+ ; let doc = ptext (sLit "In the spliced type") <+> ppr hs_ty2
; hs_ty3 <- checkNoErrs (rnLHsType doc hs_ty2)
; kcHsType hs_ty3 }
; showSplice "declarations"
zonked_q_expr
(ppr (getLoc expr) $$ (vcat (map ppr decls)))
- ; returnM decls }
+ ; return decls }
where handleErrors :: [Either a Message] -> TcM [a]
handleErrors [] = return []
-- Compile and link it; might fail if linking fails
; hsc_env <- getTopEnv
; src_span <- getSrcSpanM
- ; either_hval <- tryM $ ioToTcRn $
+ ; either_hval <- tryM $ liftIO $
HscMain.compileExpr hsc_env src_span ds_expr
; case either_hval of {
Left exn -> failWithTc (mk_msg "compile and link" exn) ;
Nothing -> recover -- Discard all msgs
}
- qRunIO io = ioToTcRn io
+ qRunIO io = liftIO io
\end{code}
\begin{code}
showSplice :: String -> LHsExpr Id -> SDoc -> TcM ()
-showSplice what before after
- = getSrcSpanM `thenM` \ loc ->
+showSplice what before after = do
+ loc <- getSrcSpanM
traceSplice (vcat [ppr loc <> colon <+> text "Splicing" <+> text what,
nest 2 (sep [nest 2 (ppr before),
text "======>",
nest 2 after])])
illegalBracket level
- = ptext SLIT("Illegal bracket at level") <+> ppr level
+ = ptext (sLit "Illegal bracket at level") <+> ppr level
illegalSplice level
- = ptext SLIT("Illegal splice at level") <+> ppr level
+ = ptext (sLit "Illegal splice at level") <+> ppr level
#endif /* GHCI */
\end{code}
tcLookupTh name
= do { (gbl_env, lcl_env) <- getEnvs
; case lookupNameEnv (tcl_env lcl_env) name of {
- Just thing -> returnM thing;
+ Just thing -> return thing;
Nothing -> do
{ if nameIsLocalOrFrom (tcg_mod gbl_env) name
then -- It's defined in this module
notInScope :: TH.Name -> SDoc
notInScope th_name = quotes (text (TH.pprint th_name)) <+>
- ptext SLIT("is not in scope at a reify")
+ ptext (sLit "is not in scope at a reify")
-- Ugh! Rather an indirect way to display the name
notInEnv :: Name -> SDoc
notInEnv name = quotes (ppr name) <+>
- ptext SLIT("is not in the type environment at a reify")
+ ptext (sLit "is not in the type environment at a reify")
------------------------------
reifyThing :: TcTyThing -> TcM TH.Info
else
return (TH.NormalC name (stricts `zip` arg_tys)) }
| otherwise
- = failWithTc (ptext SLIT("Can't reify a non-Haskell-98 data constructor:")
+ = failWithTc (ptext (sLit "Can't reify a non-Haskell-98 data constructor:")
<+> quotes (ppr dc))
------------------------------
reifyType :: TypeRep.Type -> TcM TH.Type
reifyType (TyVarTy tv) = return (TH.VarT (reifyName tv))
reifyType (TyConApp tc tys) = reify_tc_app (reifyName tc) tys
-reifyType (NoteTy _ ty) = reifyType ty
reifyType (AppTy t1 t2) = do { [r1,r2] <- reifyTypes [t1,t2] ; return (r1 `TH.AppT` r2) }
reifyType (FunTy t1 t2) = do { [r1,r2] <- reifyTypes [t1,t2] ; return (TH.ArrowT `TH.AppT` r1 `TH.AppT` r2) }
reifyType ty@(ForAllTy _ _) = do { cxt' <- reifyCxt cxt;
reifyPred :: TypeRep.PredType -> TcM TH.Type
reifyPred (ClassP cls tys) = reify_tc_app (reifyName cls) tys
-reifyPred p@(IParam _ _) = noTH SLIT("implicit parameters") (ppr p)
+reifyPred p@(IParam _ _) = noTH (sLit "implicit parameters") (ppr p)
------------------------------
------------------------------
noTH :: LitString -> SDoc -> TcM a
-noTH s d = failWithTc (hsep [ptext SLIT("Can't represent") <+> ptext s <+>
- ptext SLIT("in Template Haskell:"),
+noTH s d = failWithTc (hsep [ptext (sLit "Can't represent") <+> ptext s <+>
+ ptext (sLit "in Template Haskell:"),
nest 2 d])
\end{code}