bug#19768: json.el: end-of-file errors untrappable

[era eriksson]

On Wed, Feb 4, 2015, at 17:34, Stefan Monnier wrote:
> > I'm not sure what the proper fix should be.  Maybe these occurrences
> > could be changed to json-end-of-file or something?
> 
> That sounds right.  If we define json-end-of-file as an error which as
> `end-of-file' as parent, it should give us the best of both worlds.

https://github.com/tripleee/emacs/tree/bug19768 contains a simple patch
which implements this, but I am uncertain how to test it.  Also, I am
having second thoughts about defining the new error symbol as a child of
'end-of-file when all the other error symbols neatly inherit from
'json-error.  Anyway, feel free to review and/or pull and/or ignore. (-:

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