One of the great new features in Visual Studio 2013 is the ability to view function return values in the debugger. This works not just for C# and VB, but for F#, as well. We didn’t include this in our list of new Visual F# tools features for F# 3.1, but we think it will make many F# developers happy nonetheless!
It even works for curried and anonymous functions, if you step through the code.