class IDL::AST::Port

def expanded_mirror_copy(name_pfx, enc)
  p = IDL::AST::Port.new("#{name_pfx}_#{self.name}", enc, {type: @idltype, porttype: PORT_MIRRORS[@porttype]})
  p.annotations << Annotation.new(EXTPORTDEF_ANNOTATION, { extended_port_name: name_pfx, base_name: self.name, mirror: true })
  p # return expanded copy
end