Normally in Perl 6, only roles are allowed to be parametric. Here, we'll be attempting to make classes, a kind (referred to from here on out as a metaobject) that isn't normally allowed to be parametric, parametric.
If you try to make a class parametric the naive way, this happens:
bastille% perl6 -e 'class Foo[::T] {}'
===SORRY!=== Error while compiling -e
Unable to parse class definition
at -e:1
------> class Foo?[::T] {}
expecting any of:
generic role
But if you …