ANS Forth:
0 >in 2dup ! !
which leads to:
$ gforth
Gforth 0.7.0, Copyright (C) 1995-2008 Free Software Foundation, Inc.
Gforth comes with ABSOLUTELY NO WARRANTY; for details type `license'
Type `bye' to exit
0 >in 2dup ! !
:1: Stack overflow
0 >in 2dup >>>!<<< !
Backtrace:
$B71DF6EC r>
$B71D34A4 perform
$B71DD654 (search-wordlist)
$3
$0
$B71DD734 (vocfind)
$B71D34A4 perform
$B71D351C (search-wordlist)
$B71D3FF4 find-name
In fact, the 2nd ! is never executed.
>in is an integer variable that contains the current position within the input line, the program attempts to write zero to >in two times, but after the first write (!) the input pointer is reset to the start of input line, and the 2nd pair of values is left on the stack...