[HOWTO] call a method on a PMC in PIR

[Karl Forner]

I suppose that again it is a trivial question, but I did not manage to find
the answer by myself in the documentation.
So I want for example to call diretly the "elements" method on a
FixedBooleanArray

I tried

  pmc.elements()
  pmc."elements"()
  pmc._elements()
  pmc.__elements()

But it did not work...

In fact, what I really want to do, for debugging purposes, is to add a
custom method in the FixedBooleanArray.pmc (e.g get_allocated_size() ) and
be able to call it
from PIR test code.

Thanks
Karl Forner