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*** Gtk3::Gdk::keyval_name: passed too many parameters (expected 1, go
+t 2); ignoring excess at keyval.pl line 22.
Argument "Gtk3::Gdk" isn't numeric in subroutine entry at
    /usr/lib/x86_64-linux-gnu/perl5/5.26/Glib/Object/Introspection.pm 
+line 67 (#1)

#!/usr/bin/perl
use strict;
use diagnostics;
...
$window->show_all();
 
Gtk3->main();