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[PATCH] Add deleted std::thread(const thread&&) constructor


LWG 2097 says that the templated std::thread(Callable&&, Args&&...)
constructor should not participate in overload resolution when
decay_t<Callable> is std::thread. Rather than removing it from the
overload set we just ensure that there are better matches, but we fail
to do so for const rvalues. This fixes it.

	PR libstdc++/78956
	* include/std/thread (thread(const thread&&)): Add deleted
	constructor.
	* testsuite/30_threads/thread/cons/lwg2097.cc: New test.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document


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