class YARD::Handlers::Ruby::MixinHandler

def process_mixin(mixin)
  raise YARD::Parser::UndocumentableError unless mixin.ref?
  raise YARD::Parser::UndocumentableError if mixin.first.type == :ident
  if mixin.type == :var_ref && mixin[0] == s(:kw, "self")
    obj = namespace
  else
    case obj = Proxy.new(namespace, mixin.source)
    when ConstantObject # If a constant is included, use its value as the real object
      obj = Proxy.new(namespace, obj.value, :module)
    else
      obj = Proxy.new(namespace, mixin.source, :module)
    end
  end
  rec = recipient(mixin)
  return if rec.nil?
  ensure_loaded!(rec)
  return if rec.mixins(scope).include?(obj)
  shift = statement.method_name(true) == :include ? :unshift : :push
  rec.mixins(scope).send(shift, obj)
end

def recipient(mixin)
  if statement[0].type == :const_path_ref || statement[0].type == :top_const_ref
    Proxy.new(namespace, statement[0].source)
  elsif statement[0].type == :var_ref && statement[0][0] != s(:kw, "self")
    statement[0][0].type == :const ?
      Proxy.new(namespace, statement.namespace.source) :
      nil
  else
    namespace
  end
end