Question about generic nullable, CA1508, CS8602

[Cyl18]

    public sealed class ImmutableNullableContainer<T>
    {
        [MaybeNull]
        public T? Value { [return: MaybeNull] get; }

        public ImmutableNullableContainer(T? value)
        {
            Value = value;
        }

        public override string? ToString()
            => Value.ToString();
    }

it shows CS8602.
if I add a ? after Value, it shows CA1508:

And I can't pass null to the constructor:

• Version: .NET 5

[yaakov-h]

I'm not seeing the same errors.

https://sharplab.io/#v2:C4LgTgrgdgNAJiA1AHwMRQgG0wQwEaYCmABIVPkQLABQNAAgEwCM9ADMXUwHQAiAljgDmUAPYBnYHwDGYrgGERcQgEFymAJ5i+YgNw16TAJwAKKIQDuxAJIBbGxGAVCAOSy4ChBVEd8zYADycrAB8pm4AlOF6tNR0AMzEYoQ4RHAcDNZ2Dk6u2E5ePn7+ACrBNADeNMTVxADaALI46ngubgC6VTXxxMUA/MQAaikQJOV1dADsIMSNza3YbcSChMA6xAC++tQ1HAm29o4eue5EBTi+hGDGfcQAbsOE4Z3Vlds7NUOYI8QAvHcP0R2mxiO26IlulzAfCUHCYrH6xREAGVgFCoIJjE83u9fsFBg9elxESi0RiojRgUA

What version of Visual Studio are you using?

[Cyl18]

16.8.4
and I have enabled all analyzers <AnalysisMode>AllEnabledByDefault</AnalysisMode>

[333fred]

And I can't pass null to the constructor:

You can if T is actually resolved to a real type. You can also pass default at the location you showed.

As to the CA warning, that looks like a bug. Please file an issue on dotnet/roslyn-analyzers.

[Cyl18]

thanks!