From @masak

<masak> r​: macro foo { quasi { my &bar = { say "OH HAI" }; bar } }; foo
<p6eval> rakudo 64208d​: OUTPUT«===SORRY!===␤CHECK FAILED​:␤Undefined
routine '&bar' called (line 1)␤»
<masak> r​: macro foo { quasi { my &bar = { say "OH HAI" }; &bar() } }; foo
<p6eval> rakudo 64208d​: OUTPUT«Cannot assign into a PMCNULL container [...]
* masak submits rakudobug
<masak> none of this is surprising, of course, since we already know
assignments to locally declared variables don't work properly in quasi
blocks.
<masak> r​: macro foo { quasi { my $bar = "OH HAI"; say $bar } }; foo
<p6eval> rakudo 64208d​: OUTPUT«Cannot assign into a PMCNULL container [...]
<masak> r​: macro foo { quasi { my $bar; say $bar } }; foo
<p6eval> rakudo 64208d​: OUTPUT«Mu()␤»

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