Requires.NotNull should accept values of type `T?`

[9at8]

https://dotnetfiddle.net/rB8FPD

In the following code, the Requires.NotNull call displays a warning

The Requires.NotNull function should accept values of type T? instead of T

#nullable enable

using System;
using Microsoft;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine("Hello World");
		
		Foo? str = null;

		Requires.NotNull(str, "");
	}
	
	private class Foo {
	}
}

[AArnott]

Thanks for the feedback, but this decision was carefully considered in #37 and the design we have is intentional.
Requires is for argument validation, and if you call Requires.NotNull on an argument, the parameter should not be declared as nullable. That is why Requires.NotNull does not take nullable arguments -- it helps ensure your parameter declaration is honest about your nullable expectations.
In your sample code, Requires isn't the right class to use. You should use Assumes for validating your internal state.