[perl #115360] [BUG] LTA error message when declaring a class that does 'is' on something that doesn't exist in Rakudo

[Carl Mäsak]

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<masak> r: class F is Blah { }
<p6eval> rakudo d171b9: OUTPUT«===SORRY!===␤Cannot call
'trait_mod:<is>'; none of these signatures match [...]
<diakopter> it should say Blah is not declared
<masak> arguably, yes.
<masak> actually, I had gotten used to the crappy error message, but
you're right, it should.
* masak submits rakudobug