ARGF
ARGV
BEGIN
DATA
END
ENV
FALSE
NIL
RUBY_PLATFORM
RUBY_RELEASE_DATE
RUBY_VERSION
STDERR
STDIN
STDOUT
TRUE
alias
and
begin
break
case
class
def
defined
do
else
elsif
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