Merged revisions 61876,63280 via svnmerge from

https://svn.boost.org/svn/boost/trunk

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  r61876 | dgregor | 2010-05-09 09:40:45 -0400 (Sun, 09 May 2010) | 8 lines
  
  Both Proto and Xpressive have "ignore_unused" templates in their
  detail headers, and both were getting included, causing overloading
  ambiguities. There is probably a major cleanup to do here, moving to a
  single "ignore_unused" in boost/detail, but for now I've rectified the
  problem by describing importing Proto's ignore_unused() into Xpressive
  rather than defining a new one.
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  r63280 | eric_niebler | 2010-06-24 00:08:23 -0400 (Thu, 24 Jun 2010) | 1 line
  
  qualify calls to ignore_unused
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[SVN r63281]

Author: Eric Niebler