HaloO chromatic, you wrote:
That was always my goal for roles in the first place. I'll be a little sad if Perl 6 requires an explicit notation to behave correctly here -- that is, if the default check is for subtyping, not polymorphic equivalence.
What is "polymorphic equivalence" to you? I remember us discussion the issue of duck typing versus nominal typing. I'll try to dig that out. But here is a version from memory using John's pointlike role: %h<x y new midpoint> = T.new(1), T.new(2), &new, &midpoint; where &new and &midpoint refer to code objects with applicable signature. Then I think that we have %h.does(Point) === False; %h.like(Point) === True; with the second test being more elaborate and hence more expensive. Regards, TSa. -- "The unavoidable price of reliability is simplicity" -- C.A.R. Hoare 1 + 2 + 3 + 4 + ... = -1/12 -- Srinivasa Ramanujan
