- agent
- alias
- all
- and
- as
- assign
- class
- convert
- create
- creation
- debug
- deferred
- do
- else
- elseif
- end
- expanded
- export
- external
- feature
- from
- frozen
- if
- implies
- indexing
- infix
- inherit
- inspect
- is
- like
- local
- loop
- not
- obsolete
- old
- once
- or
- prefix
- pure
- redefine
- reference
- rename
- rescue
- retry
- separate
- then
- undefine
- Current
- False
- Precursor
- Result
- TUPLE
- True
- check
- ensure
- invariant
- require
- variant