thakis added a comment. Re-re-reading http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0619r4.html#3.2, the recommendation is "We will consider again for C++23". So I think this should be enabled with -std=c++20 at the earliest, since that's where the idea is from. But even there it's uncertain if it's going to happen. So I'd say put it in -pedantic, and possibly enable it by default with -std=c++20.
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