C# is probably the king of contextual keywords, they have tens of them. They started I believe with `yield return` and `yield break` and then added all of the L

C# is probably the king of contextual keywords, they have tens of them. They started I believe with `yield return` and `yield break` and then added all of the LINQ ones (select, from, where etc), and kept adding others (notnull, record, required, etc).