namespace System
{
    public readonly struct Int32 : IComparable, IComparable<int>, IConvertible, IEquatable<int>, IFormattable, IParsable<int>, ISpanFormattable, ISpanParsable<int>, IUtf8SpanFormattable, IUtf8SpanParsable<int>, IAdditionOperators<int, int, int>, IAdditiveIdentity<int, int>, IBinaryInteger<int>, IBinaryNumber<int>, IBitwiseOperators<int, int, int>, IComparisonOperators<int, int, bool>, IDecrementOperators<int>, IDivisionOperators<int, int, int>, IEqualityOperators<int, int, bool>, IIncrementOperators<int>, IMinMaxValue<int>, IModulusOperators<int, int, int>, IMultiplicativeIdentity<int, int>, IMultiplyOperators<int, int, int>, INumber<int>, INumberBase<int>, IShiftOperators<int, int, int>, ISignedNumber<int>, ISubtractionOperators<int, int, int>, IUnaryNegationOperators<int, int>, IUnaryPlusOperators<int, int>
    {
        public static int PopCount(int value);
    }
}