209b `«« «» »»`

----- Example session ----- Bold text is input, plain text is the program's reaction. `[rtn]` is the return key. NOTE: THE ACTIONS FORTH NORMALLY TAKES AFTER AN ERROR WILL BE SUPPRESSED.
    EX [rtn]
    0: [ DROP [rtn] -4 THROW executes
    0: [ 12 [rtn]
    1: 12 [ 1999 [rtn]
    2: 12 1999 [ : ZWAP [rtn]
    2: 12 1999 ] QWERTY [rtn] -61 THROW executes
`EVALUATE` can't grok`QWERTY` -- this is neither a word nor a number. However, compile-state is kept intact, as is the stack.
    2: 12 1999 ] 2>R [rtn]
    2: 12 1999 ] R> R> [rtn]
    2: 12 1999 ] ; [rtn]
Notwithstanding the error, `ZWAP` seems to have been compiled.
    2: 12 1999 [ ZWAP [rtn]
    2: 1999 12 [ ' ASDF [rtn] -13 THROW executes
TICK can't find`ASDF`.
    2: 1999 12 [ -56 THROW [rtn]
    [rtn]  ok
    .S [rtn] ( 1999 12 )  ok
`EX` enters an infinite loop which you only can break out of by using`QUIT` or`BYE`. Of course`BYE` is inappropriate. `-56 throw` is a special`THROW` that executes`QUIT`. Also try`ABORT` and`TRUE ABORT" Hello!"` `ABORT` should execute`-1 THROW`. Some Forths allow`ABORT"` in interpretation state and execute`-2 THROW`. `»»`