When I wrote Perl6::Roles, stvn and I talked through this issue, along with chromatic, Luke, and Tim. The P6 spec says a few things:

More importantly, it currently says nothing on whether a role exposes an interface or if it is, itself, the interface. Please bring that up on P6l if that's a problem for you. Right now, P6 roles export EVERTHING, including methods, subs, and the like.

I briefly thought about providing an optional mechanism by which you can specify in the role what it actually exports. I didn't implement it because that wasn't one of Tim's requirements and I was writing this for him to use in DBIv2. However, if that is one of your requirements, I can easily add it in less than 20 minutes. Please specify if you want to use an array a la Exporter or if you want to use attributes.

My criteria for good software:
  1. Does it work?
  2. Can someone else come in, make a change, and be reasonably certain no bugs were introduced?

In reply to Re^5: Detecting an imported function by dragonchild
in thread Detecting an imported function by Ovid

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