If an IDisposable field is readonly it cannot be set to null in the Dispose(bool) method

[sonnemaf]

Issue Details

If an IDisposable field is readonly it cannot be set to null in the Dispose(bool) method. You get a compiler error.

Line 18 should not be generated when the field is readonly.

[GenerateDispose(false)]
public partial class LogWriter  {

    [DisposeField(false)]
    private readonly StreamWriter _streamWriter;

    public LogWriter(string path) {
        _streamWriter = new StreamWriter(path);
    }

    public void WriteLine(string text) => _streamWriter.WriteLine(text.ToUpper());
}