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bug#3824: 23.1.50; too much effort is put into handling Scheme S-express

From: Taylor R Campbell
Subject: bug#3824: 23.1.50; too much effort is put into handling Scheme S-expression comments, causing problems
Date: Tue, 3 May 2011 17:20:52 +0000
User-agent: IMAIL/1.21; Edwin/3.116; MIT-Scheme/9.1

Gosh, this must have gotten buried in my inbox a long time ago, and I
completely forgot about it...  Sorry about that!

   Date: Tue, 14 Jul 2009 15:52:52 -0400
   From: Stefan Monnier <address@hidden>

   > Emacs should treat `#;' as whitespace, nothing more.

   Of course, that's also incorrect with its own set of problems (mostly
   indentation), but admittedly, those problems are easier for the user to

What problems?  I think it would be perfectly reasonable for #; not to
affect indentation except inasmuch as it moves code following it on
the same line by two columns just like two spaces would.  For example,
I think the following is reasonable indentation:

(cond ((foo? bar) baz)
      ((quux? zot) mumble)  #;
      ((grog? swat) zoogle)
      #;((blort? gronk)
   #; (else (frotz)))

I wouldn't use the second two examples myself, because it takes zero
effort to make an editor treat #; as the start of a line comment
(e.g., Edwin does this) and that works perfectly well as long as you
don't put anything interesting on the line.

   Can you try the patch below?

I tried it.  Seems to work on a couple simple cases I threw at it, but
I haven't tried it in anger yet.

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