Ключевые слова

* alias
* and
* BEGIN
* begin
* break
* case
* class
* def
* defined
* do
* else
* elsif
* END
* end
* ensure
* false
* for
* if
* in
* module
* next
* nil
* not
* or
* redo
* rescue
* retry
* return
* self
* super
* then
* true
* undef
* unless
* until
* when
* while
* yield