+ = newIPNameRn n `thenM` \ name ->
+ rnHsType doc ty `thenM` \ ty' ->
+ returnM (HsIParam name ty')
+\end{code}
+
+
+*********************************************************
+* *
+\subsection{Patterns}
+* *
+*********************************************************
+
+\begin{code}
+rnPatsAndThen :: HsMatchContext Name
+ -> Bool
+ -> [RdrNamePat]
+ -> ([RenamedPat] -> RnM (a, FreeVars))
+ -> RnM (a, FreeVars)
+-- Bring into scope all the binders and type variables
+-- bound by the patterns; then rename the patterns; then
+-- do the thing inside.
+--
+-- Note that we do a single bindLocalsRn for all the
+-- matches together, so that we spot the repeated variable in
+-- f x x = 1
+
+rnPatsAndThen ctxt repUnused pats thing_inside
+ = bindPatSigTyVarsFV pat_sig_tys $
+ bindLocalsFV doc_pat bndrs $ \ new_bndrs ->
+ rnPats pats `thenM` \ (pats', pat_fvs) ->
+ thing_inside pats' `thenM` \ (res, res_fvs) ->
+
+ let
+ unused_binders = filter (not . (`elemNameSet` res_fvs)) new_bndrs
+ in
+ (if repUnused
+ then warnUnusedMatches unused_binders
+ else returnM ()) `thenM_`
+ returnM (res, res_fvs `plusFV` pat_fvs)
+ where
+ pat_sig_tys = collectSigTysFromPats pats
+ bndrs = collectPatsBinders pats
+ doc_pat = ptext SLIT("In") <+> pprMatchContext ctxt
+
+rnPats :: [RdrNamePat] -> RnM ([RenamedPat], FreeVars)
+rnPats ps = mapFvRn rnPat ps
+
+rnPat :: RdrNamePat -> RnM (RenamedPat, FreeVars)
+
+rnPat (WildPat _) = returnM (WildPat placeHolderType, emptyFVs)
+
+rnPat (VarPat name)
+ = lookupBndrRn name `thenM` \ vname ->
+ returnM (VarPat vname, emptyFVs)
+
+rnPat (SigPatIn pat ty)
+ = doptM Opt_GlasgowExts `thenM` \ glaExts ->
+
+ if glaExts
+ then rnPat pat `thenM` \ (pat', fvs1) ->
+ rnHsTypeFVs doc ty `thenM` \ (ty', fvs2) ->
+ returnM (SigPatIn pat' ty', fvs1 `plusFV` fvs2)
+
+ else addErr (patSigErr ty) `thenM_`
+ rnPat pat
+ where
+ doc = text "In a pattern type-signature"
+
+rnPat (LitPat s@(HsString _))
+ = returnM (LitPat s, unitFV eqStringName)
+
+rnPat (LitPat lit)
+ = litFVs lit `thenM` \ fvs ->
+ returnM (LitPat lit, fvs)
+
+rnPat (NPatIn lit mb_neg)
+ = rnOverLit lit `thenM` \ (lit', fvs1) ->
+ (case mb_neg of
+ Nothing -> returnM (Nothing, emptyFVs)
+ Just _ -> lookupSyntaxName negateName `thenM` \ (neg, fvs) ->
+ returnM (Just neg, fvs)
+ ) `thenM` \ (mb_neg', fvs2) ->
+ returnM (NPatIn lit' mb_neg',
+ fvs1 `plusFV` fvs2 `addOneFV` eqClassName)
+ -- Needed to find equality on pattern
+
+rnPat (NPlusKPatIn name lit _)
+ = rnOverLit lit `thenM` \ (lit', fvs1) ->
+ lookupBndrRn name `thenM` \ name' ->
+ lookupSyntaxName minusName `thenM` \ (minus, fvs2) ->
+ returnM (NPlusKPatIn name' lit' minus,
+ fvs1 `plusFV` fvs2 `addOneFV` integralClassName)
+ -- The Report says that n+k patterns must be in Integral
+
+rnPat (LazyPat pat)
+ = rnPat pat `thenM` \ (pat', fvs) ->
+ returnM (LazyPat pat', fvs)
+
+rnPat (AsPat name pat)
+ = rnPat pat `thenM` \ (pat', fvs) ->
+ lookupBndrRn name `thenM` \ vname ->
+ returnM (AsPat vname pat', fvs)
+
+rnPat (ConPatIn con stuff) = rnConPat con stuff
+
+
+rnPat (ParPat pat)
+ = rnPat pat `thenM` \ (pat', fvs) ->
+ returnM (ParPat pat', fvs)
+
+rnPat (ListPat pats _)
+ = rnPats pats `thenM` \ (patslist, fvs) ->
+ returnM (ListPat patslist placeHolderType, fvs `addOneFV` listTyCon_name)
+
+rnPat (PArrPat pats _)
+ = rnPats pats `thenM` \ (patslist, fvs) ->
+ returnM (PArrPat patslist placeHolderType,
+ fvs `plusFV` implicit_fvs `addOneFV` parrTyCon_name)
+ where
+ implicit_fvs = mkFVs [lengthPName, indexPName]
+
+rnPat (TuplePat pats boxed)
+ = checkTupSize tup_size `thenM_`
+ rnPats pats `thenM` \ (patslist, fvs) ->
+ returnM (TuplePat patslist boxed, fvs `addOneFV` tycon_name)
+ where
+ tup_size = length pats
+ tycon_name = tupleTyCon_name boxed tup_size
+
+rnPat (TypePat name) =
+ rnHsTypeFVs (text "In a type pattern") name `thenM` \ (name', fvs) ->
+ returnM (TypePat name', fvs)
+
+------------------------------
+rnConPat con (PrefixCon pats)
+ = lookupOccRn con `thenM` \ con' ->
+ rnPats pats `thenM` \ (pats', fvs) ->
+ returnM (ConPatIn con' (PrefixCon pats'), fvs `addOneFV` con')
+
+rnConPat con (RecCon rpats)
+ = lookupOccRn con `thenM` \ con' ->
+ rnRpats rpats `thenM` \ (rpats', fvs) ->
+ returnM (ConPatIn con' (RecCon rpats'), fvs `addOneFV` con')
+
+rnConPat con (InfixCon pat1 pat2)
+ = lookupOccRn con `thenM` \ con' ->
+ rnPat pat1 `thenM` \ (pat1', fvs1) ->
+ rnPat pat2 `thenM` \ (pat2', fvs2) ->
+ lookupFixityRn con' `thenM` \ fixity ->
+ mkConOpPatRn con' fixity pat1' pat2' `thenM` \ pat' ->
+ returnM (pat', fvs1 `plusFV` fvs2 `addOneFV` con')
+
+------------------------
+rnRpats rpats
+ = mappM_ field_dup_err dup_fields `thenM_`
+ mapFvRn rn_rpat rpats `thenM` \ (rpats', fvs) ->
+ returnM (rpats', fvs)
+ where
+ (_, dup_fields) = removeDups compare [ f | (f,_) <- rpats ]
+
+ field_dup_err dups = addErr (dupFieldErr "pattern" dups)
+
+ rn_rpat (field, pat)
+ = lookupGlobalOccRn field `thenM` \ fieldname ->
+ rnPat pat `thenM` \ (pat', fvs) ->
+ returnM ((fieldname, pat'), fvs `addOneFV` fieldname)