[perl #64310] $^a can be used after $a in a block in Rakudo

[Carl Mäsak]

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<masak> rakudo: sub foo { my $a = 5; say $^a }; foo(7)
<p6eval> rakudo c01555: OUTPUT«5␤»
<moritz_> that looks... wrong
<masak> aye.
<masak> bug reporting time.

Compile-time error, perhaps?