class RDoc::Context

def add_alias(an_alias)
  meth = find_instance_method_named(an_alias.old_name)
  if meth then
    add_alias_impl an_alias, meth
  else
    add_to @aliases, an_alias
    unmatched_alias_list = @unmatched_alias_lists[an_alias.old_name] ||= []
    unmatched_alias_list.push an_alias
  end
  an_alias
end