From @masak

<TimToady> m​: .say
<camelia> rakudo-moar 41fe4f​: OUTPUT«Nil␤»
<TimToady> that's not right
* masak submits rakudobug
<TimToady> m​: say $_.WHAT
<camelia> rakudo-moar 41fe4f​: OUTPUT«Nil␤»
<TimToady> should blow up on of those ways
<jnthn> Huh, I thought $_ was initialized to Any?
<TimToady> now *that* is a bad occurence of Nil
<TimToady> I dont know when it changed
<jnthn> Me either.
<masak> just to be clear for the bug report, what should `.say` do?
<masak> and what should `say $_.WHAT` do?
<TimToady> probably print (Mu)
<jnthn> Well, (Any) if it's like any other normal Scalar
<jnthn> (Type-constraint is Mu, default value is Any)
<TimToady> or arguably that, yes
<masak> ok, so the whole problem is that $_ contains Nil, not Any?
<masak> ok.

From @FROGGS

Fixed by lizmat++.

Patch​: rakudo/rakudo@9862a14
Tests​: Raku/roast@4499063

@FROGGS - Status changed from 'new' to 'resolved'