https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65327
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Presumably started with r166013.

Note that in
constexpr volatile int a = 42;
constexpr int b = a;
the initialization of b should be rejected, but it is not.  This is a related
problem though, my patch doesn't change it.

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