##-
# Author: Brian Tiffin
# Dedicated to the public domain
#
# Date: August 2016
# Modified: 2016-10-03/23:02-0400
##+
#
# &null, the null value
#

# b will be given a default value, a will remain unset
procedure main()
    \a := "a"
    /b := "b"
    if a === &null then write("a is &null")
    if b === &null then write("b is &null") else write("b is ", image(b))
end