       10 // DELETE test program
       20 //
       30 SELECT OUTPUT "sel.out"
       40 PRINT "Hello"
       50 SELECT OUTPUT ""
       60 //
       70 DELETE "sel.out"
       80 //
       90 TRAP
      100   OPEN FILE 1, "sel.out", READ 
      110   SYS assert, FALSE
      120 ENDTRAP
      130 //
      140 PRINT "Ok"
