start(address:)
A default implementation that throws ServerStartError.unsupportedAddress
for .unixDomainSocket(path:)
if start(address:)
is not implemented by the conforming type, or calls the deprecated .start(hostname:port:)
method for other cases.
This declaration is deprecated: The Server receiving this message does not support all address types, and must be updated.
func start(address: BindAddress?) throws