Problems when Factory delivers an IDisposable

[dscopra]

If a Factory method returns an IDisposable instead if a class that implements IDisposable, the code is not marked.

This code works:

using System.IO;
namespace DisFixerTest {
    public class ClassThatUsesFactoyInCtor {
        public ClassThatUsesFactoyInCtor() {
            var factory = new Factory();
            var mem = factory.Create();
        }
    }
    class Factory {
        public MemoryStream Create() {
            return new MemoryStream();
        }
    }
}

But this does not work:

using System.IO;
namespace DisFixerTest {
    public class ClassThatUsesFactoyInCtor {
        public ClassThatUsesFactoyInCtor() {
            var factory = new Factory();
            var mem = factory.Create();
        }
    }
    class Factory {
        public IDisposable Create() {
            return new MemoryStream();
        }
    }
}