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[PATCH] PR libstdc++/80762 avoid ambiguous __constructible_from<void, void>


Ensure we don't try to instantiate __is_constructible_from<void, void>,
because there are two partial specializations that are equally good
matches.

	PR libstdc++/80762
	* include/bits/fs_path.h (path::_Path): Use remove_cv_t and is_void.
	* include/experimental/bits/fs_path.h (path::_Path): Likewise.
	* testsuite/27_io/filesystem/path/construct/80762.cc: New test.
	* testsuite/experimental/filesystem/path/construct/80762.cc: New test.

Tested x86_64-linux (and manually verified it fixes the clang errors).

Committed to trunk. This is worth backporting too, I think.

Attachment: patch.txt
Description: Text document


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