C# 8 introduced new syntax to index from the end of an array:

var last = array[^1];

The C# compiler translates ^ into an Index object. We would need to support new overloads for array access, IEnumerable.ElementAt(Index), and related methods.

More details on the C#8 syntax can be found here:

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/member-access-operators#index-from-end-operator-