Re: output from syntax-check

[Alfred M. Szmidt]

   > Unfortunately, doing that is often at odds with the goals of
   > keeping the test code simple and efficient.  If you find small
   > and clean changes that improve matters without inducing
   > inordinate inefficiency even in projects with thousands of source
   > files, please send a patch.

   Proposed sed extension to help this:
   <http://lists.gnu.org/archive/html/bug-gnu-utils/2009-11/msg00030.html>

This is a good aproach, but for compilation-mode to work you need the
line number as well.  Would it be acceptable for syntax-check to use
this option if it is included in GNU sed?  It wouldn't be compatible
with POSIX sed, but one could do a check for the option and only use
it if one is using GNU sed.