--- Comment #2 from W E Brown <webrown.cpp at gmail dot com> ---
Please note that the submitted test program seems not to meet the #include
requirement as articulated in N4835 clause [expr.spaceship] p10:

"10 The five comparison category types (17.11.2) (the types
std::strong_ordering, std::strong_equality, std::weak_ordering,
std::weak_equality, and std::partial_ordering) are not predefined; if the
header <compare> (17.11.1) is not included prior to a use of such a class type
– even an implicit use in which the type is not named (e.g., via the auto
specifier ( in a defaulted three-way comparison (11.11.3) or use of the
built-in operator) – the program is ill-formed."

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