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Re: [Emacs-diffs] emacs-25 326ffcc: Allow line comments ending with esca

From: Paul Eggert
Subject: Re: [Emacs-diffs] emacs-25 326ffcc: Allow line comments ending with escaped NL to be continued to the next line.
Date: Mon, 28 Dec 2015 08:41:23 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.4.0

Stefan Monnier wrote:
Hmm... the way I read this, it would mean that


will be treated as an unclosed comment.  Is that the way C defines it as well?

No, that's a closed comment. More interestingly, this:

printf ("\

is a closed comment followed by printf ("\n"), because backslash-newline removal is done before tokenization. So the "right" fix would be to ignore backslash-newline before identifying comments and other tokens.

Backslash-backslash-newline can be tricky, as I recall from long ago when I was hacking on the GNU C preprocessor.

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