[Bug c++/59426] __has_trivial_{copy/assign} behavior differs from documentation

[richard-gccbugzilla at metafoo dot co.uk]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59426

Richard Smith <richard-gccbugzilla at metafoo dot co.uk> changed:

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--- Comment #2 from Richard Smith <richard-gccbugzilla at metafoo dot co.uk> ---
Which C++11 semantics? Is __has_trivial_copy(T) intended to determine:
 1) if T has a trivial copy constructor, or
 2) whether T has a trivial copy constructor and no non-trivial copy
constructor, or
 3) whether the constructor selected to perform a copy from a 'const T' lvalue
would be trivial, or 
 4) the value of std::is_trivially_copyable<T>::value?