I modified the code a little bit to catch the crash:

use v6;

my @a=();

for 1..20000 -> $i {
    if      $i%100 == 0 { print $i; }
    elsif   $i%10 == 0  { print "*" }
    else                { print "." }
    my $l="123;123;123;123";
    my @f=$l.split(";");
    @a.push(@f[1]);
}

and the results are undeterministic:

krzysztof-kielaks-macbook:ATM - Analiza X.2009 krzys$ perl6 t1.p6
.........*.........*.........*.........*.........*.........*.........*.........*.........*.........100.........*.........*.........*.........*.........*.........*.........*.........*.........*.........200.........*.........*.........*.........*.........*.........*.........*.........*.........*.........300.........*.........*.........*.........*.........*.........*.........*.........*.........*.........400.........*.........*.........*.........*.........*.........*.........*.........*.........*.........500.........*.........*.........*.........*.........*.........*.........*.........*.........*.........600.........*.........*.........*.........*.........*.........*.........*.........*.........*.........700.........*.........*.........*.........*.........*.........*.........*.........*.........*.........800.........*.........*.........*.........*.........*.........*.........*.........*.........*.........900.........*.........*.........*.........*.........*.........*.........*.........*.........*.........1000.........*.........*.........*.........*......Segmentation
fault
krzysztof-kielaks-macbook:ATM - Analiza X.2009 krzys$
krzysztof-kielaks-macbook:ATM - Analiza X.2009 krzys$ perl6 t1.p6
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- Analiza X.2009 krzys$ perl6 t1.p6
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