[perl #78752] [BUG] LTA error message when declaring two-colon-sigil variable ::Foo in Rakudo

[Carl Mäsak]

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<moritz_> rakudo: my ::A
<p6eval> rakudo 5f5bae: OUTPUT«===SORRY!===␤Malformed my at line 22,
near "::A"␤»
<jnthn> std: my ::A;
<p6eval> std a194beb: OUTPUT«===SORRY!===␤Illegal
redeclaration of symbol 'A' (see line 1) at /tmp/2_oKyMhSZP line
1:␤------> my ::A⏏;␤Multiple prefix constraints not
yet supported [...]
<moritz_> that's a LTA error
* masak submits rakudobug

First, the two error messages in Rakudo and STD.pm6 don't agree; they
probably should. Second, even the error message of STD.pm6 seems
suspect. Why is it a redeclaration?