redef fun property_name do return "%"
end
+redef class AUplusExpr
+ redef fun property_name do return "unary +"
+ redef fun compute_raw_arguments do return new Array[AExpr]
+end
+
redef class AUminusExpr
redef fun property_name do return "unary -"
redef fun compute_raw_arguments do return new Array[AExpr]