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[PATCH] PR libstdc++/79486 use lvalues in result_of expressions


This is a similar bug to the is_callable assertions I fixed in
shared_ptr the other day: it needs to use the correct value category
in the result_of type. This is also a regression, in code that has
been refactored on trunk.

	PR libstdc++/79486
	* include/std/future (__future_base::_Task_state::_M_run)
	(__future_base::_Task_state::_M_run_delayed): Use lvalue types in
	result_of expressions.
	* testsuite/30_threads/packaged_task/79486.cc: New.

Tested powerpc64le-linux, committed to trunk.


Attachment: patch.txt
Description: Text document


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