jruby 9.1.6.0 (2.3.1) 2016-11-09 0150a76 Java HotSpot(TM) 64-Bit Server VM 25.111-b14 on 1.8.0_111-b14 +jit [linux-x86_64]
Linux frank-nb 4.4.0-57-generic #78-Ubuntu SMP Fri Dec 9 23:50:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
yard (0.9.5)

# Module level description

module TestYard

  # test method documentation
  #
  # @param a [String] test params
  # @return [Date] test return type
  def test(a)
  end

end

jruby-9.1.2.0 :014 > YARD::Parser::Ruby::RubyParser.parse(File.read('test_yard.rb')).root
 => s(s(:module, s(:const_ref, s(:const, "TestYard")), s(s(:void_stmt, ), s(:def, s(:ident, "test"), s(:paren, s(:params, s(s(:ident, "a")), nil, nil, nil, nil, nil, nil)), s(s(:void_stmt, ))))))

jruby-9.1.6.0 :020 > YARD::Parser::Ruby::RubyParser.parse(File.read('test_yard.rb')).root
 => s(s(:module, s(:const_ref, s(:const, "TestYard")), s(s(:void_stmt, ), s(:def, s(:ident, "test"), s(:paren, s(:params, s(s(:ident, "a")), nil, nil, nil, nil, nil, nil)), s(s(:void_stmt, ))))), s(:comment, "Module level description"), s(:comment, "test method documentation\n\n@param a [String] test params\n@return [Date] test return type"))