Adds <concepts>: same_as, convertible_to, invocable, equality_comparable, regular…
Other papers in Standard library concepts
P1248R1Remove
CommonReference requirement from StrictWeakOrderingSan Diego 2018P1754R1Rename concepts to standard_case for C++20, while we still canCologne 2019P1871R1Concept traits should be named after conceptsBelfast 2019P1964R2Wording for *boolean-testable*Prague 2020P2102R0Make 'implicit expression variations' more explicitPrague 2020All 6 papers in Standard library concepts →