i: Data
t:  variable
  variable foo
t:  value
  value bar
  bar 0 try
t:  to
  100 to bar bar 100 try
  200 to bar bar 200 try
t:  base
   base drop
t:  @
   10 base @ try
t:  !
   16 16 base ! base @ try
   a base !
t:  compiler
   [ -1 compiler ! ] is }}
   [  0 compiler ! ] is-macro {{
   [ 1 {{ 2 swap }} ] swap 2 try invoke 1 try
t:  heap
   [ 0 {{ 0 heap @ ! invoke 0 try
t:  +!
   100 foo !
   10 foo +!
   foo @ 110 try
t:  -!
   10 foo -!
   foo @ 100 try
t:  on
   foo on
   foo @ TRUE try
t:  off
   foo off
   foo @ FALSE try
t:  toggle
   foo off
   foo @ FALSE try
   foo toggle
   foo @ TRUE try
   foo toggle
   foo @ FALSE try
t:  Sizing
   100 chars 100 char-size * try
   100 cells 100 cell-size * try
   1 cells cell+ 1 cells cell-size + try
   1 chars char+ 1 chars char-size + try
