Implements parts of:
- P0896R4 The One Ranges Proposal`
Depends on D100275.
cjdb on Apr 11 2021, 6:19 PM.Authored by
Mostly LGTM, with minor nits.
Chris and I had a chat offline and we agreed that the derived_from part of the subsumption tests can be removed, and so the tests moved back to test/std. LGTM with those changes in.