[perl #115364] [BUG] LTA error message when doing 'is' on a package declaration in Rakudo

[Carl Mäsak]

# New Ticket Created by  "Carl Mäsak" 
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<masak> r: package X is Associative { }
<p6eval> rakudo d171b9: OUTPUT«===SORRY!===␤Method 'add_parent' not
found for invocant of class 'Perl6::Metamodel::PackageHOW'␤at
/tmp/mq69N3UynC:1␤»
<masak> heh.
* masak submits rakudobug
<masak> the MOP and packages are not the best of friends, it seems.
<jnthn> The fix is to check for an add_parent method and whine if it
ain't there.
<masak> right.
<masak> agree.