PPC0033: method-like calls to lexical subs

[haarg]

Add a syntax $object->&method(@args) that calls method as a sub, to allow a nicer syntax for private methods.

[esabol]

I think the "Future Scope" section should be part of the current scope of this PPC. If it were, I'd fully support it. class is here now, and putting off any class-related implementation of this PPC to some nebulous future only makes the transition to using class less attractive and take longer.

[haarg]

I will clarify that this should work for public methods in the class syntax, but I had put that in the future scope section because my method is not yet supported. This PPC would be a way to make lexical methods in the class syntax viable, but support for lexical methods is a separate issue from the call syntax.

[leonerd]

I've had a go at implementing the my method syntax in Perl/perl5#22940 as it was an oversight not to have done it anyway. That said, we might want to wait until implementing this PPC as well to get them both in at once, to avoid an intermediate situation whereby my method exists but ->& does not, leading to having to suggest the "just call it like a sub" workaround.

[leonerd]

I'm definitely in favour of this. In fact if it were merged soon I'd like to get an implementation of it added in with my my method PR above. It makes sense to add them both together; as either without the other is rather pointless. So the PR is largely waiting on this idea.