Rule S3966: FP when using StreamWriter

[costin-zaharia-sonarsource]

Description

StreamWriter is closing and not disposing the underling stream. See: https://github.com/microsoft/referencesource/blob/master/mscorlib/system/io/streamwriter.cs#L269

Rule description needs to be updated too since it's based on this FP.

Source: #209 (comment)

Repro steps

using (Stream stream = new FileStream("file.txt", FileMode.OpenOrCreate))
{
    using (StreamWriter writer = new StreamWriter(stream))  // Noncompliant: 'stream' will be disposed twice
    {
        // Use the writer object...
    }
}

Expected behavior

There should be no diagnostic raised for stream in this case since it is not disposed twice.

Actual behavior

A FP is raised reporting that the stream was disposed twice.

Known workarounds

None.

Related information

• C#/VB.NET Plugins Version: https://github.com/SonarSource/sonar-dotnet/releases/tag/8.13.1.21947