What happens when you want to have a method without any arguments in the middle of those other methods?

Just write it with an empty array reference: 

my $window = Gtk2::Window->new( "toplevel" )->call_method_list(
    signal_connect   => [ delete_event => sub { Gtk2->main_quit } ],
    set_title        => "Test",
    my_argumentless_method => [],
    set_border_width => 15,
    add => Gtk2::Button->new( "Quit" )->call_method_list(
        signal_connect => [ clicked => sub { Gtk2->main_quit } ] ),
    'show_all',
);

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In reply to Re^3: multiple method calls against the same object, revisited by simonm
in thread multiple method calls against the same object, revisited by Aristotle

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