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From: Javier <nospam@nospam.com>
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Subject: Re: Editing comments
Date: Sun, 7 Jun 2015 18:47:05 +0000 (UTC)
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>> Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
>>> commented code might need some edits too. In that case some basic
>>> commands like forward-sexp are not available.
>>>
>>> Is there a minor-mode, un-commenting temporarily, writing back the result?

You can always disable a block of code by an if(false).  The emacs
major mode will work fine that way and reactivating the code is just
changing 0 by 1.

Python
if(0):
    ...

C with preprocessor directives
#if 0
...
#endif

TeX
\iffalse
...
\fi

LaTeX with the comment environment in the verbatim package.
\begin{comment}
...
\end{comment}