F# defining/using a type/module in another file in the same project

This will hopefully be an easy one. I have an F# project (latest F# CTP) with two files (Program.fs, Stack.fs). In Stack.fs I have a simple namespace and type definition

Stack.fs

namespace Col

type Stack= 
 ...

Now I try to include the namespace in Program.fs by declaring

open Col

This doesn't work and gives me the error "The namespace or module Col is not defined." Yet it's defined within the same project. I've got to be missing something obvious

What order are the files in the project? Stack.fs needs to come before Program.fs for Program.fs to be able to 'see' it.

See also the start of

http://lorgonblog.spaces.live.com/blog/cns!701679AD17B6D310!444.entry

and the end of

http://lorgonblog.spaces.live.com/blog/cns!701679AD17B6D310!347.entry

I had the same problems, and you are right, the order of the files is taken in account by the compiler. Instead of the Remove and Add pattern, you can use the Move Up / Move Down items in the context menu associated to the .fs files. (Alt-Up and Alt-Down are the shortcut keys in most of the standard key-bindings)

All of the above are correct, but how to do this in VS2013 is another question. I had to edit my .fsproj file manually, and set the files in exact order within an ItemGroup node. In this case it would look like this:

<ItemGroup>
    <Compile Include="Stack.fs" />
    <Compile Include="Program.fs" />
    <None Include="App.config" />
</ItemGroup>