struct with two SFINAE parameters crashes

[anarthal]

#include <type_traits>

namespace boost::mysql {

template <class T, class En1 = void, class En2 = void>
struct writable_field_traits
{
};

template <class T>
struct writable_field_traits<T, typename std::enable_if<std::is_same<T, int>::value>::type, void>
{
};

template <class T>
struct writable_field_traits<T, void, typename std::enable_if<std::is_same<T, bool>::value>::type>
{
};

}  // namespace boost::mysql

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Spotted by accident, since this code is private and shouldn't appear in the final documentation. Does not block me.