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From: egarrulo <egarrulo@gmail.com>
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Subject: Highlighting a missing final newline?
Date: Tue, 22 Mar 2016 12:30:45 +0100
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How would you highlight a missing final newline?  I mean: if a buffer 
lacks a final newline, then you would see a (customizable) character at 
the end of the buffer; otherwise, you would see nothing.

AFAIK, `font-lock-add-keywords' can't help here because there is no 
character to highlight.  I have looked into `whitespace-mode' for 
inspiration, but the code is too complex for me.

Thank you.