invalid sync sibling (few troubles)

[lsoft]

Consider the method:

[Zomp.SyncMethodGenerator.CreateSyncVersion]
public async Task<bool> TestMethodAsync()
{
    var testInt = 1;

    if (testInt is 2)
    {
        await Task.Delay(1);
        return false;
    }

    if (testInt is not 2)
    {
        await Task.Delay(1);
        return true;
    }

    var testEnum = MyEnum.None;

    if (testEnum is MyEnum.None)
    {
        await Task.Delay(1);
        return true;
    }

    if (testEnum is not MyEnum.None)
    {
        await Task.Delay(1);
        return false;
    }

    return true;
}

the generator produces the following:

public bool TestMethod()
{
    var testInt = 1;

    if (testInt is int) //ERROR
    {
        global::System.Threading.Thread.Sleep(1);
        return false;
    }

    if (testInt is not int) //ERROR
    {
        global::System.Threading.Thread.Sleep(1);
        return true;
    }

    var testEnum = global::ConsoleApp181.Class1.MyEnum.None;

    if (testEnum is global::ConsoleApp181.Class1.MyEnum.None)
    {
        global::System.Threading.Thread.Sleep(1);
        return true;
    }

    if (testEnum is not global::ConsoleApp181.Class1.MyEnum) //ERROR
    {
        global::System.Threading.Thread.Sleep(1);
        return false;
    }

    return true;
}

There are few problems with enum values and constant int values.

        public enum MyEnum
        {
            None = 0,
            Yes = 1
        }