doucette/ndesk-options-mirror — comment on commit 67d4f321f4273d4254434b157dafd3d8e5062a20
File: src/NDesk.Options/NDesk.Options/Options.cs line 766
By doucette:

The library needs to compile for .NET 2, so I would have to wrap it in `#if LINQ` and provide this implementation as a fallback regardless. Besides, `c.Missing.Count` is already O(1) and faster than `c.Missing.Any()`.