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This patch adds test for [CWG170](https://cplusplus.github.io/CWG/issues/170.html). The resolution adds explicit undefined behavior, so I think the best we can do is to put the test into constexpr evaluator. Change to [expr.static.cast] is not tested, because it was a drive-by fix that removed an impossible case (I confirmed it using minutes). Minutes mention several times a comprehensive paper in this design space which no one seem to remember. I believe it's [P0149R0](https://wg21.link/p0149r0) "Generalised member pointers".