[perl #125722] use trace + is repr(...) don't mix

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# New Ticket Created by  Rob Hoelz 
# Please include the string:  [perl #125722]
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# <URL: https://rt.perl.org/Ticket/Display.html?id=125722 >


See the attached example.
use v6;

use trace;

class MyClass is repr('P6Opaque') {}