Handle a signal

We note with glee that the task does not require us to print consecutive integers, so we'll print Fibonacci numbers instead. :-)

signal(SIGINT).tap: {
    note "Took { now - INIT now } seconds.";
    exit;
}

for 0, 1, *+* ... * {
    sleep 0.5;
    .say;
}

Output:

0
1
1
2
3
5
8
13
21
34
55
89
^CTook 6.3437449 seconds.
Aborted

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