This no longer leads to a Null PMC access on Parrot (the output is identical on
Moar and JVM):
$ perl6-p -e 'role popo { macro marco { $^a but popo }; marco popo; }'
===SORRY!=== Error while compiling -e
None of the parametric role variants for 'popo' matched the arguments supplied.
Cannot call ''; none of these signatures match:
at -e:1
------>
I added a test to S14-roles/mixin.t with commit
https://github.com/perl6/roast/commit/22a988135a.
I'm closing this ticket now. (In case the ticket was not only about the NPMCA
and the command is meant to compile, please re-open the ticket.)
