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use warnings;
use strict;
...
void pin_mode (int pin, int mode){
    pinMode(pin, mode);
}

running
cref handler
...
running
dler
Segmentation fault

$ gdb perl

...
#1  0x000c0434 in Perl_runops_standard ()
#2  0x000500a4 in perl_run ()
#3  0x0002ab50 in main ()