[m-rev.] for review: read interface files via bespoke parse tree types

[Zoltan Somogyi]

On Thu, 5 Sep 2019 11:40:50 +1000 (AEST), Julien Fischer <jfischer at opturion.com> wrote:
> > +:- type may_change_source_file_name
> > +    --->    may_not_change_source_file_name
> > +    ;       may_change_source_file_name.
> 
> Add a comment describing this type.

Done. Thanks for the review.

Zoltan.