in src/Microsoft.VisualStudio.Validation/Requires.cs [316:328]
public static void NullOrNotNullElements<T>(IEnumerable<T> values, string? parameterName)
{
if (values is object)
{
foreach (T value in values)
{
if (value is null)
{
throw new ArgumentException(Format(Strings.Argument_NullElement, parameterName), parameterName);
}
}
}
}