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