While debugging in Visual Studio, would you rather write this:

Microsoft.Fharp.Collections.List.Map<int>(
    Microsoft.FSharp.Core.FuncConvert.ToFSharpFunc<int, int>(
        x => f.Invoke(x)), myList)

or this?

myList |> List.map f

This project aims to make it possible to write Watch and QuickWatch expressions in F# instead of C#.

VisualStudio APIs provide debugging support by giving you an expression which the user has typed, and some context about which variables are currently in scope and what their types are, and expecting you to give back some some IL which it will execute to produce a value. It then gives you the opportunity to format that value in language-specific ways. So to get F# expression debugging, all that is needed is to use FSharp.Compiler.Service to parse the text into a partially-typed AST, add context-specific information from the debugging to transform that into a fully-typed AST, and use FSharp.Compiler.Service to turn that typed AST into IL for the debugger.

This is a work in progress.