Worked pretty much how I expected it to:

>> module TestModule
>>   attr_accessor :attribute
>> end
=> nil
>> class TestClass
>>   include TestModule
>> end
=> TestClass
>> tc = TestClass.new
=> #<TestClass:0x2dc17c8>
>> tc.attribute = "Hello, world"
=> "Hello, world"
>> puts tc.attribute
Hello, world
=> nil

Farrel