From @usev6

After a recent change to roast [1] there are some new failing tests on
the JVM backend similiar to this one​:

$ ./perl6-j -Ilib -e 'use Test; is({"a" => 1}.keyof, Str(Any))'
not ok 1 -
# Failed test at -e line 1
# expected​: (?(?))
# got​: (?(?))

If I'm not mistaken, the underlying problem is, that information about
a parametric type is not available once something like Str(Any)
(Perl6​::Metamodel​::CoercionHOW) is put into a container.

$ ./perl6-j -e 'use nqp; my $bar = Str(Any); say nqp​::isnull(nqp​::typeparameterized($bar)); say $bar.^name; say nqp​::isnull(nqp​::typeparameterized(nqp​::decont($bar))); say nqp​::decont($bar).^name'
1
?(?)
0
Str(Any)

This does not happen on MoarVM​:

$ ./perl6-m -e 'use nqp; my $bar = Str(Any); say nqp​::isnull(nqp​::typeparameterized($bar)); say $bar.^name; say nqp​::isnull(nqp​::typeparameterized(nqp​::decont($bar))); say nqp​::decont($bar).^name'
0
Str(Any)
0
Str(Any)

I'm not sure if this should to be fixed in JVM specific code (nqp) or
at a higher level (using nqp​::decont in Rakudo). Currently we don't
use any nqp​::decont in src/Perl6/Metamodel/CoercionHOW.nqp and
friends.

[1] Raku/roast@7145799cce

From @usev6

This was fixed with Raku/nqp@f6bccf79d8

Only some of the fudged tests are passing now, since a different issue surfaced after the above fix​: https://rt-archive.perl.org/perl6/Ticket/Display.html?id=132694

I'm closing this ticket as 'resolved'.

@usev6 - Status changed from 'new' to 'resolved'