I don't get that warning on linux, so can't test, but the problem seems to be that the chomp is executed even after you pressed ctrl-C. Did you try to move the chomp on a line by itself or add a noop inbetween so that there is another statement to break on?

my $choice = <>;
chomp($choice);

#or even

my $choice = <>;
$choice=$choice;
chomp($choice);
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