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{
    .signal_connect( :delete{ Gtk2.main_quit } );
...
    .add( .signal_connect( :clicked{ Gtk2.main_quit } ) on Gtk2::Butto
+n.new( "Quit" ) );
    .show_all;
} on Gtk2::Window.new( "toplevel" );

my $window = map {
    $_->signal_connect( delete_event => sub { Gtk2->main_quit } );
...
    $_->show_all();
    $_;
} Gtk2::Window->new( "toplevel" );