This works now (skids++). I added tests to S06-signature/arity.t with commits https://github.com/perl6/roast/commit/08b64b732a and https://github.com/perl6/roast/commit/1c8e5abec0
I'm closing this ticket as 'resolved'.
[perl #77744] [BUG] Number of reported actual parameters sent in to an assuming-derived method is always 0 in Rakudo
Christian Bartolomaeus via RT Wed, 08 Jul 2015 13:26:32 -0700
