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Full name of submitter (unless configured in github; will be published with the issue): Tim Song
Reference (section label): [cpp.cond]
Link to reflector thread (if any):
Issue description:
P2795R5 should, but did not, update the definition of __has_cpp_attribute for the new attribute it added.
Other attributes also have a note or recommended practice on when __has_cpp_attribute should produce zero, but it is not clear if there is anything to say about [[indeterminate]] as we presumably do not want to suggest that a value of zero makes the undefined behavior erroneous instead (cf. [[noreturn]]).