Types which have no Namespace cause a compiler error

[sonnemaf]

Types which have no Namespace cause a compiler error (Identifier expected)

using IDisposableGenerator;

//namespace Test;

[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());
}