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[PATCH] Fix bootstrap with --enable-fully-dynamic-string


	PR libstdc++/86447
	* src/c++11/cow-stdexcept.cc [_GLIBCXX_FULLY_DYNAMIC_STRING]
	(logic_error::logic_error(logic_error&&))
	(logic_error::operator=(logic_error&&))
	(runtime_error::runtime_error(runtime_error&&))
	(runtime_error::operator=(runtime_error&&)): Copy strings instead of
	moving, to avoid allocating empty reps for moved-from strings.

Tested x86_64-linux, committed to trunk.


Attachment: patch.txt
Description: Text document


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