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      I’m especially looking forward to the Applicative computation expressions. I never caught on to defining operator symbols and coding applicatives that way. I do use a custom computation expression when I need it. A standard computation expression in the language will be nicer to have.

      I know the Microsoft F# team is working hard to get this Extension members visible to trait constraints fix into the release as well. It apparently is not easy. https://github.com/dotnet/fsharp/pull/6805

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      Features that may still make it to F# 5, but the team has not committed to shipping https://github.com/dotnet/fsharp/pulls?q=is%3Aopen+is%3Apr+label%3A%22Candidate+for+F%23+vNext%22