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[patch] fix libstdc++/56613


This fixes a regression. Technically we shouldn't call construct() for
the node, only for the value within it, but I plan to fix that for
4.9, this just restores the previous behaviour when using a type
meeting the C++03 Allocator requirements.

        PR libstdc++/56613
        * include/bits/stl_tree.h (_Rb_tree::_M_create_node): Use
        allocator_traits instead of calling construct directly.
        * testsuite/23_containers/map/56613.cc: New.


Tested x86_64-linux, committed to trunk.

Attachment: patch.txt
Description: Text document


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