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This partially reverts my previous change related to this macro. The C++20 constexpr iterator requirements are always met by array:iterator, because it's just a pointer. So the macro can be set to 201803 even in C++17 mode. * include/bits/stl_iterator.h (__cpp_lib_array_constexpr): Revert value for C++17 to 201803L because P0858R0 is supported for C++17. * include/std/version (__cpp_lib_array_constexpr): Likewise. * testsuite/23_containers/array/element_access/constexpr_c++17.cc: Check for value corresponding to P0031R0 features being tested. * testsuite/23_containers/array/requirements/constexpr_iter.cc: Check for value corresponding to P0858R0 features being tested.
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