shell> perldoc -q '$#'
Segmentation fault (core dumped)

##</code><code>##

(gdb) bt
#0  0x080d2fb0 in S_find_byclass () at eval.c:41
#1  0x080d2ce4 in Perl_re_intuit_start () at eval.c:41
#2  0x0809b6f3 in Perl_pp_match () at eval.c:41
#3  0x080990d8 in Perl_runops_standard () at eval.c:41
#4  0x0805c5f3 in S_run_body () at eval.c:41
#5  0x0805c342 in perl_run () at eval.c:41
#6  0x08059fd0 in main () at eval.c:41
#7  0x40073177 in __libc_start_main (main=0x8059f60 <main>, argc=4, ubp_av=0xbffff8fc, init=0x8059194 <_init>, fini=0x80dfa00 <_fini>,
    rtld_fini=0x4000e184 <_dl_fini>, stack_end=0xbffff8ec) at ../sysdeps/generic/libc-start.c:129