From @titsuki

See the following result​:

$ perl6 -e 'class TypeHouse { has Int @​.array; }; TypeHouse.^attributes[0].type.say;'
Cannot unbox a type object
  in block <unit> at -e line 1

$ perl6 --version
This is Rakudo version 2016.09-105-g4abc28c built on MoarVM version 2016.09-13-g34c375a
implementing Perl 6.c.

From @geekosaur

[08 02​:06​:10] <geekosaur> m​: class TypeHouse { has Int @​.array; }; dd
TypeHouse.^attributes[0];
[08 02​:06​:11] <camelia> rakudo-moar 2285d3​: OUTPUT«Attribute @​!array =
Attribute.new␤
[08 02​:06​:11] »
[08 02​:06​:24] <geekosaur> m​: class TypeHouse { has Int @​.array; }; dd
TypeHouse.^attributes[0].type;
[08 02​:06​:25] <camelia> rakudo-moar 2285d3​: OUTPUT«Positional[Int]␤
[08 02​:06​:25] »

So it's the implicit .gist done by say on the type object that is dying,
not something on the way to it. (This may be expected.)

--
brandon s allbery kf8nh sine nomine associates
allbery.b@​gmail.com ballbery@​sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net

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

From @MasterDuke17

Fixed in rakudo/rakudo#899

Tests added in Raku/roast@7d6ddc6

@MasterDuke17 - Status changed from 'open' to 'resolved'