namespace System
{
    /// <summary>
    /// Indicates that a switch expression that was non-exhaustive failed to match its input
    /// at runtime, e.g. in the C# 8 expression <code>3 switch { 4 => 5 }</code>.
    /// The exception optionally contains an object representing the unmatched value.
    /// </summary>
    [System.Runtime.InteropServices.ComVisible(true)]
    [Serializable]
    public class MatchFailureException : InvalidOperationException
    {
        public MatchFailureException();
        public MatchFailureException(object unmatchedValue);
        public object UnmatchedValue { get; }
        [System.Security.SecurityCritical]
        public override void GetObjectData(SerializationInfo info, StreamingContext context);
    }
}