IDISP016 when using outer.

[JohanLarsson]

            [Test]
            public void LeaveOpenLocals()
            {
                var testCode = @"
namespace RoslynSandbox
{
    using System.IO;
    using System.Text;

    public class C
    {
        public C(string fileName)
        {
            using (var stream = File.OpenRead(fileName))
            {
                using (var reader = new StreamReader(stream, new UTF8Encoding(), true, 1024, leaveOpen: false))
                {
                    _ = reader.ReadLine();
                }

                _ = ↓stream.ReadByte();
            }
        }
    }
}";

                AnalyzerAssert.Diagnostics(Analyzer, ExpectedDiagnostic, testCode);
            }