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given(Gtk::FileDialog->new()) {
    .ok_button.label("Load");
...
    .connect_signal(destroy => sub { ... });
    # ...
}

my $window = map {
    $_->signal_connect(delete => sub { Gtk->exit(0) });
...
    } Gtk::Button->new("Quit");
    $_->show;
} Gtk::Window->new("toplevel");