#
#          R E S U L T   S E Q U E N C E   I M A G E S
#

#  This program illustrates a technique for producing string images
#  of result sequences, using co-expressions.

procedure main()
   write(Seqimage(create 1 to 10))
   write(Seqimage(create &fail))
   write(Seqimage(create (1 to 10 by 2) | (10 to 1 by -2)))
   write(Seqimage(create !"abc" || !"xy"))
   write(Seqimage(create Seqimage | main))
   write(Seqimage(create |read()))
end

procedure Seqimage(e)
   local s
   s := ""
   while s ||:= ", " || image(@e)
   return "{" || s[3:0] || "}" | "{}"
end