#SRC: V9GEN

procedure main(a)
   local x, l0, l1, l2, l3, l4, l5, l6, l7, l8, l9
   static y
   variable("a") := 1
   variable("x") := 2
   variable("y") := 3
   if variable("z") then write("oops z")
   &subject := "abcde"
   &pos := 3
   write("&pos &subject: ", &pos, " ", variable("&subject"))
   variable("&subject") := "wxyz"
   write("&pos &subject: ", &pos, " ", variable("&subject"))
   if variable("&clock") then write("oops &clock")
   main2()
   write()

   # test display()
   # some formats should differ from those of image()
   l0 := []
   l1 := [&letters -- 'jJ']
   l2 := ["supercalifragilistic", "expialidocious"]
   l3 := [&phi, &e, &pi]
   l4 := [1,2,3,4]
   l5 := [1,2,3,4,5]
   l6 := [1,2,3,4,5,6]
   l7 := [1,2,3,4,5,6,7]
   l8 := [1,2,3,4,5,6,7,8]
   l9 := [l0, l1, l2, l3, l4, l5, l6, l7, l8]
   recurse(1, 4)
end

record complex(r,i)

procedure main2(a)
   local T, L, L1
   static s
   every write(image(name(main | T | L | s | a)))
   T := table()
   L := list(200)
   L1 := []
   every 1 to 200 do push(L1,1)
   write(image(L[10]))
   write(image(name(&error)))
   write(image(name(T["abc"])))
   T["abc"] := 1
   write(image(name(T["abc"])))
   every write(image(name(L[1 | 2 | 3 | -1 | -10])))
   every write(image(name(L1[1 | 2 | 3 | -1 | -10])))
   write(image(name(complex().r)))
   return
end

procedure recurse(a,b)	# to build up some context for display() 
   local x, y
   x := a + b
   y := a - b
   if a < 5 then
      recurse(a + 1, b + a)
   else {
      write(repl('-',70))
      display(3, &output)
      write(repl('-',70))
      display(, &output)
      write(repl('-',70))
      }
   return
end