namespace Microsoft.FSharp.Core
{
    [CompilationMapping(SourceConstructFlags.SumType)]
    [CompilationRepresentation(CompilationRepresentationFlags.UseNullAsTrueValue)]
    [CompiledName("FSharpOption`1")]
    [DebuggerDisplay("{get_DebugDisplay(this),nq}")]
    [DefaultAugmentation(false)]
    [StructuralComparison]
    [StructuralEquality]
    public sealed class FSharpOption<T> : IStructuralComparable, IStructuralEquatable, IComparable, IComparable<FSharpOption<T>>, IEquatable<FSharpOption<T>>
    {
        public static bool get_IsNone(FSharpOption<T> value);
    }
}