-- \ x -> e op x,
-- or
-- \ x -> op e x,
--- or just
+-- or, if PostfixOperators is enabled, just
-- op e
--
--- We treat it as similar to the latter, so we don't
+-- With PostfixOperators we don't
-- actually require the function to take two arguments
-- at all. For example, (x `not`) means (not x);
--- you get postfix operators! Not really Haskell 98
--- I suppose, but it's less work and kind of useful.
+-- you get postfix operators! Not Haskell 98,
+-- but it's less work and kind of useful.
tcExpr in_expr@(SectionL arg1 lop@(L loc op)) res_ty
- = do { (op', [arg1']) <- tcApp op 1 (tcArgs lop [arg1]) res_ty
- ; return (SectionL arg1' (L loc op')) }
+ = do dflags <- getDOpts
+ if dopt Opt_PostfixOperators dflags
+ then do (op', [arg1']) <- tcApp op 1 (tcArgs lop [arg1]) res_ty
+ return (SectionL arg1' (L loc op'))
+ else do (co_fn, (op', arg1'))
+ <- subFunTys doc 1 res_ty
+ $ \ [arg2_ty'] res_ty' ->
+ tcApp op 2 (tc_args arg2_ty') res_ty'
+ return (mkHsWrap co_fn (SectionL arg1' (L loc op')))
+ where
+ doc = ptext (sLit "The section") <+> quotes (ppr in_expr)
+ <+> ptext (sLit "takes one argument")
+ tc_args arg2_ty' qtvs qtys [arg1_ty, arg2_ty]
+ = do { boxyUnify arg2_ty' (substTyWith qtvs qtys arg2_ty)
+ ; arg1' <- tcArg lop 2 arg1 qtvs qtys arg1_ty
+ ; qtys' <- mapM refineBox qtys -- c.f. tcArgs
+ ; return (qtys', arg1') }
+ tc_args _ _ _ _ = panic "tcExpr SectionL"
-- Right sections, equivalent to \ x -> x `op` expr, or
-- \ x -> op x expr
tcApp op 2 (tc_args arg1_ty') res_ty'
; return (mkHsWrap co_fn (SectionR (L loc op') arg2')) }
where
- doc = ptext SLIT("The section") <+> quotes (ppr in_expr)
- <+> ptext SLIT("takes one argument")
+ doc = ptext (sLit "The section") <+> quotes (ppr in_expr)
+ <+> ptext (sLit "takes one argument")
tc_args arg1_ty' qtvs qtys [arg1_ty, arg2_ty]
= do { boxyUnify arg1_ty' (substTyWith qtvs qtys arg1_ty)
; arg2' <- tcArg lop 2 arg2 qtvs qtys arg2_ty
-- The scrutinee should have a rigid type if x,y do
-- The general scheme is the same as in tcIdApp
tcExpr (ExplicitTuple exprs boxity) res_ty
- = do { tvs <- newBoxyTyVars [argTypeKind | e <- exprs]
+ = do { let kind = case boxity of { Boxed -> liftedTypeKind
+ ; Unboxed -> argTypeKind }
+ ; tvs <- newBoxyTyVars [kind | e <- exprs]
; let tup_tc = tupleTyCon boxity (length exprs)
tup_res_ty = mkTyConApp tup_tc (mkTyVarTys tvs)
; checkWiredInTyCon tup_tc -- Ensure instances are available
; return $ mkHsWrapCoI coi (HsProc pat' cmd') }
tcExpr e@(HsArrApp _ _ _ _ _) _
- = failWithTc (vcat [ptext SLIT("The arrow command"), nest 2 (ppr e),
- ptext SLIT("was found where an expression was expected")])
+ = failWithTc (vcat [ptext (sLit "The arrow command"), nest 2 (ppr e),
+ ptext (sLit "was found where an expression was expected")])
tcExpr e@(HsArrForm _ _ _) _
- = failWithTc (vcat [ptext SLIT("The arrow command"), nest 2 (ppr e),
- ptext SLIT("was found where an expression was expected")])
+ = failWithTc (vcat [ptext (sLit "The arrow command"), nest 2 (ppr e),
+ ptext (sLit "was found where an expression was expected")])
\end{code}
%************************************************************************
; doStupidChecks fun ty_theta_prs'
-- Now do normal instantiation
- ; result <- go True fun ty_theta_prs'
+ ; method_sharing <- doptM Opt_MethodSharing
+ ; result <- go method_sharing True fun ty_theta_prs'
; traceTc (text "instFun result" <+> ppr result)
; return result
}
subst_pr (tvs, theta)
= (substTyVars subst tvs, substTheta subst theta)
- go _ fun [] = do {traceTc (text "go _ fun [] returns" <+> ppr fun) ; return fun }
+ go _ _ fun [] = do {traceTc (text "go _ _ fun [] returns" <+> ppr fun) ; return fun }
- go True (HsVar fun_id) ((tys,theta) : prs)
- | want_method_inst theta
+ go method_sharing True (HsVar fun_id) ((tys,theta) : prs)
+ | want_method_inst method_sharing theta
= do { traceTc (text "go (HsVar fun_id) ((tys,theta) : prs) | want_method_inst theta")
; meth_id <- newMethodWithGivenTy orig fun_id tys
- ; go False (HsVar meth_id) prs }
+ ; go method_sharing False (HsVar meth_id) prs }
-- Go round with 'False' to prevent further use
-- of newMethod: see Note [Multiple instantiation]
- go _ fun ((tys, theta) : prs)
+ go method_sharing _ fun ((tys, theta) : prs)
= do { co_fn <- instCall orig tys theta
; traceTc (text "go yields co_fn" <+> ppr co_fn)
- ; go False (HsWrap co_fn fun) prs }
+ ; go method_sharing False (HsWrap co_fn fun) prs }
-- See Note [No method sharing]
- want_method_inst theta = not (null theta) -- Overloaded
- && not opt_NoMethodSharing
+ want_method_inst method_sharing theta = not (null theta) -- Overloaded
+ && method_sharing
\end{code}
Note [Multiple instantiation]
tagToEnumError tys
- = hang (ptext SLIT("Bad call to tagToEnum#") <+> at_type)
- 2 (vcat [ptext SLIT("Specify the type by giving a type signature"),
- ptext SLIT("e.g. (tagToEnum# x) :: Bool")])
+ = hang (ptext (sLit "Bad call to tagToEnum#") <+> at_type)
+ 2 (vcat [ptext (sLit "Specify the type by giving a type signature"),
+ ptext (sLit "e.g. (tagToEnum# x) :: Bool")])
where
at_type | null tys = empty -- Probably never happens
- | otherwise = ptext SLIT("at type") <+> ppr (head tys)
+ | otherwise = ptext (sLit "at type") <+> ppr (head tys)
\end{code}
%************************************************************************
Unrefineable -> return (HsVar id, ty)
Rigid co -> return (mkHsWrap co (HsVar id), ty)
Wobbly -> traceTc (text "lookupFun" <+> ppr id) >> return (HsVar id, ty) -- Wobbly, or no free vars
- WobblyInvisible -> failWithTc (ppr id_name <+> ptext SLIT(" not in scope because it has a wobbly type (solution: add a type annotation)"))
+ WobblyInvisible -> failWithTc (ppr id_name <+> ptext (sLit " not in scope because it has a wobbly type (solution: add a type annotation)"))
}
- other -> failWithTc (ppr other <+> ptext SLIT("used where a value identifer was expected"))
+ other -> failWithTc (ppr other <+> ptext (sLit "used where a value identifer was expected"))
}
#ifndef GHCI /* GHCI and TH is off */
Boring and alphabetical:
\begin{code}
caseScrutCtxt expr
- = hang (ptext SLIT("In the scrutinee of a case expression:")) 4 (ppr expr)
+ = hang (ptext (sLit "In the scrutinee of a case expression:")) 4 (ppr expr)
exprCtxt expr
- = hang (ptext SLIT("In the expression:")) 4 (ppr expr)
+ = hang (ptext (sLit "In the expression:")) 4 (ppr expr)
fieldCtxt field_name
- = ptext SLIT("In the") <+> quotes (ppr field_name) <+> ptext SLIT("field of a record")
+ = ptext (sLit "In the") <+> quotes (ppr field_name) <+> ptext (sLit "field of a record")
funAppCtxt fun arg arg_no
- = hang (hsep [ ptext SLIT("In the"), speakNth arg_no, ptext SLIT("argument of"),
+ = hang (hsep [ ptext (sLit "In the"), speakNth arg_no, ptext (sLit "argument of"),
quotes (ppr fun) <> text ", namely"])
4 (quotes (ppr arg))
predCtxt expr
- = hang (ptext SLIT("In the predicate expression:")) 4 (ppr expr)
+ = hang (ptext (sLit "In the predicate expression:")) 4 (ppr expr)
nonVanillaUpd tycon
- = vcat [ptext SLIT("Record update for the non-Haskell-98 data type")
+ = vcat [ptext (sLit "Record update for the non-Haskell-98 data type")
<+> quotes (pprSourceTyCon tycon)
- <+> ptext SLIT("is not (yet) supported"),
- ptext SLIT("Use pattern-matching instead")]
+ <+> ptext (sLit "is not (yet) supported"),
+ ptext (sLit "Use pattern-matching instead")]
badFieldsUpd rbinds
- = hang (ptext SLIT("No constructor has all these fields:"))
+ = hang (ptext (sLit "No constructor has all these fields:"))
4 (pprQuotedList (hsRecFields rbinds))
naughtyRecordSel sel_id
- = ptext SLIT("Cannot use record selector") <+> quotes (ppr sel_id) <+>
- ptext SLIT("as a function due to escaped type variables") $$
- ptext SLIT("Probably fix: use pattern-matching syntax instead")
+ = ptext (sLit "Cannot use record selector") <+> quotes (ppr sel_id) <+>
+ ptext (sLit "as a function due to escaped type variables") $$
+ ptext (sLit "Probably fix: use pattern-matching syntax instead")
notSelector field
- = hsep [quotes (ppr field), ptext SLIT("is not a record selector")]
+ = hsep [quotes (ppr field), ptext (sLit "is not a record selector")]
missingStrictFields :: DataCon -> [FieldLabel] -> SDoc
missingStrictFields con fields
-- with strict fields
| otherwise = colon <+> pprWithCommas ppr fields
- header = ptext SLIT("Constructor") <+> quotes (ppr con) <+>
- ptext SLIT("does not have the required strict field(s)")
+ header = ptext (sLit "Constructor") <+> quotes (ppr con) <+>
+ ptext (sLit "does not have the required strict field(s)")
missingFields :: DataCon -> [FieldLabel] -> SDoc
missingFields con fields
- = ptext SLIT("Fields of") <+> quotes (ppr con) <+> ptext SLIT("not initialised:")
+ = ptext (sLit "Fields of") <+> quotes (ppr con) <+> ptext (sLit "not initialised:")
<+> pprWithCommas ppr fields
--- callCtxt fun args = ptext SLIT("In the call") <+> parens (ppr (foldl mkHsApp fun args))
+-- callCtxt fun args = ptext (sLit "In the call") <+> parens (ppr (foldl mkHsApp fun args))
#ifdef GHCI
polySpliceErr :: Id -> SDoc
polySpliceErr id
- = ptext SLIT("Can't splice the polymorphic local variable") <+> quotes (ppr id)
+ = ptext (sLit "Can't splice the polymorphic local variable") <+> quotes (ppr id)
#endif
\end{code}