[libstdc++ PATCH] Fix leak in _Rb_tree::_M_insert (stl_tree.h)

[Benjamin Kosnik]

> Running the exception test suite from STLPort 

Maybe you can post what you are doing, exactly? It would be nice to test
for this in libstdc++ as well as fixing it. 

Is this just a throwing allocator, outlined by Matt in one of his
articles? (This looks to be a near-term addition to libstdc++ testsuite,
regardless of this patch.) 

Or, something else?

-benjamin