import RnEnv
import RnNames ( importsFromLocalDecls )
import RnTypes ( rnHsTypeFVs, rnPat, litFVs, rnOverLit, rnPatsAndThen,
- dupFieldErr, precParseErr, sectionPrecErr, patSigErr )
+ dupFieldErr, precParseErr, sectionPrecErr, patSigErr, checkTupSize )
import CmdLineOpts ( DynFlag(..), opt_IgnoreAsserts )
import BasicTypes ( Fixity(..), FixityDirection(..), IPName(..),
defaultFixity, negateFixity, compareFixity )
returnM (ExplicitPArr placeHolderType exps',
fvs `addOneFV` toPName `addOneFV` parrTyCon_name)
-rnExpr (ExplicitTuple exps boxity)
- = rnExprs exps `thenM` \ (exps', fvs) ->
+rnExpr e@(ExplicitTuple exps boxity)
+ = checkTupSize tup_size `thenM_`
+ rnExprs exps `thenM` \ (exps', fvs) ->
returnM (ExplicitTuple exps' boxity, fvs `addOneFV` tycon_name)
where
- tycon_name = tupleTyCon_name boxity (length exps)
+ tup_size = length exps
+ tycon_name = tupleTyCon_name boxity tup_size
rnExpr (RecordCon con_id rbinds)
= lookupOccRn con_id `thenM` \ conname ->
rnHsSigType, rnHsTypeFVs, rnHsSigTypeFVs,
rnPat, rnPats, rnPatsAndThen, -- Here because it's not part
rnOverLit, litFVs, -- of any mutual recursion
- precParseErr, sectionPrecErr, dupFieldErr, patSigErr
+ precParseErr, sectionPrecErr, dupFieldErr, patSigErr, checkTupSize
) where
import CmdLineOpts ( DynFlag(Opt_WarnMisc, Opt_WarnUnusedMatches, Opt_GlasgowExts) )
import PrelNames( cCallishClassKeys, eqStringName, eqClassName, ordClassName,
negateName, minusName, lengthPName, indexPName, plusIntegerName, fromIntegerName,
timesIntegerName, ratioDataConName, fromRationalName, cCallableClassName )
+import Constants ( mAX_TUPLE_SIZE )
import TysWiredIn ( intTyCon )
import TysPrim ( charPrimTyCon, addrPrimTyCon, intPrimTyCon,
floatPrimTyCon, doublePrimTyCon )
implicit_fvs = mkFVs [lengthPName, indexPName]
rnPat (TuplePat pats boxed)
- = rnPats pats `thenM` \ (patslist, fvs) ->
+ = checkTupSize tup_size `thenM_`
+ rnPats pats `thenM` \ (patslist, fvs) ->
returnM (TuplePat patslist boxed, fvs `addOneFV` tycon_name)
where
- tycon_name = tupleTyCon_name boxed (length pats)
+ tup_size = length pats
+ tycon_name = tupleTyCon_name boxed tup_size
rnPat (TypePat name) =
rnHsTypeFVs (text "In a type pattern") name `thenM` \ (name', fvs) ->
%* *
%*********************************************************
-\end{code}
\begin{code}
+checkTupSize :: Int -> RnM ()
+checkTupSize tup_size
+ | tup_size <= mAX_TUPLE_SIZE
+ = returnM ()
+ | otherwise
+ = addErr (sep [ptext SLIT("A") <+> int tup_size <> ptext SLIT("-tuple is too large for GHC"),
+ nest 2 (parens (ptext SLIT("max size is") <+> int mAX_TUPLE_SIZE)),
+ nest 2 (ptext SLIT("Workaround: use nested tuples or define a data type"))])
+
forAllWarn doc ty tyvar
= ifOptM Opt_WarnUnusedMatches $
getModeRn `thenM` \ mode ->