using System.Diagnostics.CodeAnalysis; using System.Runtime.CompilerServices; namespace System { internal static class ThrowHelper { [NullableContext(2)] internal static void ThrowIfNull([NotNull] object argument, [CallerArgumentExpression("argument")] string paramName = null) { if (argument == null) Throw(paramName); } [DoesNotReturn] private static void Throw(string paramName) { throw new ArgumentNullException(paramName); } } }