f# - Why do I see the Program+ prefix when printfn tries to print an object? -

f# - Why do I see the Program+ prefix when printfn tries to print an object? -

i have object of class created, printing object %a format specifier, see typename program+myclass instead of myclass ? why that?

someone might programme namespace, if how come not able next ?

let o = program+myclass()

here total code

open scheme type myclass() = fellow member val x = 3 get,set [<entrypoint>] allow main argv = allow o = myclass() o |> printfn "here myclass object %a" console.readkey() 0 // homecoming integer exit code

as john correctly explains, part before + in program+myclass there because code compiled program module. f# modules compiled nested classes , myclass nested class within program (which static class) , + comes standard .net naming of nested classes.

you can avoid putting class in namespace (but you'll still need have main function in module):

namespace myprogram open scheme type myclass() = fellow member val x = 3 get,set module main = [<entrypoint>] allow main argv = allow o = myclass() o |> printfn "here myclass object %a" console.readkey() 0 // homecoming integer exit code

now, myclass straight in namespace (not nested class) , print without program+ prefix.

f# c#-to-f#