Merged revisions 55838,56302 via svnmerge from
https://svn.boost.org/svn/boost/trunk
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r55838 | eric_niebler | 2009-08-28 12:45:21 -0400 (Fri, 28 Aug 2009) | 1 line
reduce fusion, proto and xpressive warnings under msvc /Za switch
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r56302 | eric_niebler | 2009-09-18 16:22:47 -0400 (Fri, 18 Sep 2009) | 1 line
xpressive passes its tests on gcc under c++0x mode
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