From @masak

<masak> r​: my %h; macro attr($key, $val) { quasi { %h{ {{{$key}}} } =
{{{$val}}} } }; macro diag { quasi { say %h<x> } }; attr("x", "OH
HAI"); diag;
<camelia> rakudo-jvm e32249​: OUTPUT«java.lang.ArrayIndexOutOfBoundsException␤␤»
<camelia> ..rakudo-parrot e32249​: OUTPUT«OH HAI␤»
* masak submits rakudobug about Rakudo JVM AIOOBE-ing
<masak> j​: macro id($c) { quasi { {{{$c}}} } }; say id "alive"
<camelia> rakudo-jvm e32249​: OUTPUT«alive␤»
<masak> j​: my %h; macro st($c) { quasi { %h<foo> = {{{$c}}} } }; say st "alive"
<camelia> rakudo-jvm e32249​: OUTPUT«java.lang.ArrayIndexOutOfBoundsException␤␤»
<masak> ok, it's the %h
<masak> j​: my $v; macro st($c) { quasi { $v = {{{$c}}} } }; say st "alive"
<camelia> rakudo-jvm e32249​: OUTPUT«java.lang.ArrayIndexOutOfBoundsException␤␤»
<masak> or any variable, for that matter.
<masak> probably some OUTER not set up correctly.

@coke - Status changed from 'new' to 'stalled'