Allow for proposed new parsing of array[end] in Accessors

[mlechu]

To fix JuliaLang/julia#57269, a small-but-breaking AST change is needed (PR JuliaLang/julia#57368). The set macro in Setfield and Accessors breaks, and enough packages depend on this macro that it needs to be updated before deciding whether to merge the julialang PR.

This PR only recognizes the new way of parsing array[end], and should not change any behaviour when used with the current parser.

[aplavin]

It's not too common to include explicit support for something that's not even in nightly yet and may easily not go into any Julia version in the end... I'm not fundamentally against this, just want to clarify:
I assume that if the linked Julia PR isn't accepted in the end, we should remove this code? Also, not forget to modify it if that PR evolves on the way.

[aplavin]

This is the same replacement as for :end above, right? Then – for clarity – it should probably be defined once and assigned to a variable, with two short replace() calls following it.

[mlechu]

Thanks!

I assume that if the linked Julia PR isn't accepted in the end, we should remove this code? Also, not forget to modify it if that PR evolves on the way.

Yes, I'll update/undo these changes if they become obsolete.

[jw3126]

Just for reference it is very likely that this AST change will happen in julia and @Keno recommends merging this PR: JuliaLang/julia#57368 (comment)

[mlechu]

@jw3126 Thanks! Whenever you have time, could you add this change to a release for both packages so that I can check how the parsing change affects the packages depending on setfield and accessors?