How do you declare and consume marker interface in f#?

Question

How do you replicate this in F#?

interface IMarker
{
    // No members here
}

class MyClass : IMarker
{
// can contain code
}

Update: The following code does define marker interface, but none of the answers so far manages to producde class that implements this marker interface (see MyClass above)

type IMarker = interface     end

Answer 1

An old question, but the required syntax (F# 2.0) for this special case is actually:

type IMarker = interface end

type Marker =
  class
    interface IMarker
  end

Or alternatively (including a constructor for Marker):

type IMarker = interface end

type Marker() =
    interface IMarker

Just writing

type Marker =
  interface IMarker

is not possible because it looks like you want to create a new interface type.