Adding the following to Xyz should do the trick. 
$src_pkg = 'Xyz';
$src_pkg =~ s{::}{/}g;
$src_pkg .= '.pm';
$dst_pkg = 'Xyz::XML';
$dst_pkg =~ s{::}{/}g;
$dst_pkg .= '.pm';
$INC{$dst_pkg} = $INC{$src_pkg};

[download]

It tells Perl that Xyz::XML is already loaded, so Perl will be happy to tell Class::Trait it was successfully loaded when Class::Traits tries to load it.

In reply to Re: Class::Traits not happy with multiple packages per file by ikegami
in thread Class::Traits not happy with multiple packages per file by jeanluca

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