記号もメソッド名に使える
class C define_method( '(>_<)', proc{ puts 'hello' } ) end p C.new.methods - Object.new.methods #=> ["(>_<)"] C.new.send( '(>_<)' ) #=> hello
class C define_method( '(>_<)', proc{ puts 'hello' } ) end p C.new.methods - Object.new.methods #=> ["(>_<)"] C.new.send( '(>_<)' ) #=> hello