Lua's nil Type

Lua defines a number of reserved words, which are words that have special meaning to Lua and therefore cannot be used as identifiers such as variable or function names.

It is an error to use any of the following:

• and
• break
• do
• else
• elseif
• end
• false
• for
• function
• if
• in
• local
• nil
• not
• or
• repeat
• return
• then
• true
• until
• while