nitc :: ABinopExpr :: operator
# The name of the operator (eg '+') fun operator: String is abstract
redef fun operator do return "<"
redef fun operator do return "<="
redef fun operator do return "<<"
redef fun operator do return ">"
redef fun operator do return ">="
redef fun operator do return ">>"
redef fun operator do return "+"
redef fun operator do return "-"
redef fun operator do return "<=>"
redef fun operator do return "*"
redef fun operator do return "**"
redef fun operator do return "/"
redef fun operator do return "%"
redef fun operator do return "|"
redef fun operator do return "^"
redef fun operator do return "&"
redef fun operator do return "=="
redef fun operator do return "!="