mono/netcore/System.Private.CoreLib/shared/System/ISpanFormattable.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

namespace System
{
    internal interface ISpanFormattable
    {
        bool TryFormat(Span<char> destination, out int charsWritten, ReadOnlySpan<char> format, IFormatProvider provider);
    }
}