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A type trait that determines whether a set_error expression
is well-formed.
template<
typename R,
typename E>
struct can_set_error
Class template can_set_error is a trait that is derived from
true_type if the expression execution::set_error(std::declval<R>(),
std::declval<E>()) is well formed; otherwise false_type.
Header: asio/execution/set_error.hpp
Convenience header: asio/execution.hpp