https://en.cppreference.com/w/cpp/utility/format/format
@Yuri What was the failure case motivating the issue? Was there a port or software that otherwise has issues whilst building? Additional info/refs would be great.
This appears to be a dupe of bug 255374, where the relevent headers were added, and MFC'd to stable/13 (but not stable/12). We'll re-open that issue requesting a decision on what to do about 12.x *** This bug has been marked as a duplicate of bug 255374 ***
(In reply to Kubilay Kocak from comment #1) > What was the failure case motivating the issue? I just manually tried '#include <format>'.