From @finanalyst

$ perl6

my ($x,$y)=<abcdefg fg>;$x~~/ $y / and say "match"
Null PMC access in get_string()

From @masak

<masak> rakudo​: my $a = "a"; say "a" ~~ /$a/
<p6eval> rakudo 36017​: OUTPUT«Null PMC access in get_string() [...]
* masak submits rakudobug
<masak> rakudo​: my $a = /a/; say "a" ~~ /$a/
<p6eval> rakudo 36017​: OUTPUT«Null PMC access in get_string() [...]

From @masak

<masak> rakudo​: my $a = "foo"; $a ~~ /$a/; say "alive"
<p6eval> rakudo 5b1ff9​: OUTPUT«Null PMC access in get_string() [...]
<masak> is this a known one? how do I work around it?
* masak submits rakudobug
<masak> rakudo​: my $a = "foo"; my $workaround = eval("/'$a'/"); say $a
~~ $workaround
<p6eval> rakudo 5b1ff9​: OUTPUT«foo␤»
<masak> that works.

From @kyleha

This is the same as 61960, so I'm merging them.

From @kyleha

This is an automatically generated mail to inform you that tests are now available in b/t/spec/S05-interpolation/regex-in-variable.t

The RT System itself - Status changed from 'new' to 'open'

From philipp@marek.priv.at

rakudo​: my $a="​:"; my $b="aa​:a​:ag.​:f"; $b.subst( /$a/, "-"); say $b;
rakudo 8dc189​: Null PMC access in get_string()&#​9252;in Main (file <unknown>, line
<unknown>)&#​9252;

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From @ShimmerFairy

The stated problems no longer generate Null PMC access, and the
additions to t/spec/S05-interpolation/regex-in-variable.t related to
this bug pass, so this bug is resolved.
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@ShimmerFairy - Status changed from 'open' to 'resolved'