f#-3.0

I want to be able to do this: let duration = 1<hours> + 2<minutes> + 3<seconds> with the following types and functions (and possibly more units of measure): type [<Measure>] seconds type [<Measure>] minutes type [<Measure>] hours let seconds_per_minute = 60<seconds> / 1<minutes> let minutes_per_hour = 60<minutes> / 1<hours> let minutes_to_seconds minutes seconds = minutes * seconds_per_minute + seconds let hours_to_minutes hours minutes = hours * minutes_per_hour + minutes So basically "hours_to_minutes" should be used for adding hours and minutes, and "minutes_to_seconds" should be used for

Just trying out F# 3.0 and hit a bit of a wall when it comes to grouping by multiple columns. The obvious thing to try was query { for d in context.table do groupBy (d.col1,d.col2) into g select (g.Key) } But I get a "Only parameterless constructors and initializers are supported in LINQ to Entities." exception. I can't seem to find an example on msdn http://msdn.microsoft.com/en-us/library/hh225374(v=vs.110).aspx http://msdn.microsoft.com/en-us/library/hh361035(v=vs.110).aspx And I realize my question is similar to " Entity Framework and Anonymous Types in F# " but it seems to be powerpack/F

I was hoping to upgrade to F# 3.0 but I can't find either a packaged F# 3.0 compiler on Microsoft site, nor if there is an express version to use. Is it possible to install F# 3.0 for use from the command line or a simple IDE and if so, how? The standalone version of F# is not available yet, but F# tools for Visual Studio Express have been released just 2 days ago, so you can get F# 3.0 for free. Announcing F# Tools for Visual Studio Express 2012 for Web! As far as I know, there are definitely plans for open-source release (that can be integrated with MonoDevelop) and it would make sense to