arabic in 1.4 - something makes compilation get stuck

lib/resource-1.4/arabic/AdverbAra.gf

@@ -0,0 +1,21 @@
+concrete AdverbAra of Adverb = CatAra ** open ResAra, Prelude in {
+
+  lin
+    PositAdvAdj a = {s = a.s ! APosit Masc Sg Indef Acc} ;
+--    ComparAdvAdj cadv a np = {
+--      s = cadv.s ++ a.s ! AAdv ++ "مِنْ" ++ np.s ! Gen
+--      } ;
+--    ComparAdvAdjS cadv a s = {
+--      s = cadv.s ++ a.s ! AAdv ++ "تهَن" ++ s.s
+--      } ;
+
+    PrepNP prep np = {s = prep.s ++ np.s ! Gen} ;
+
+--    AdAdv = cc2 ;
+--
+--    SubjS = cc2 ;
+--    AdvSC s = s ; --- this rule give stack overflow in ordinary parsing
+--
+--    AdnCAdv cadv = {s = cadv.s ++ "تهَن"} ;
+--
+}