anchor.diff:    | G of Prop2 : int64 * Prop3: float32
   
   [<Fact>]
  -let ``struct DU`` () =
  +let ``struct `` () =
   
     let input = E
     let actual = convert input
  
positive.code:   let input: Result<int, string> = Error "error"
    let actual = convert input
    Assert.Equal(input, actual)
  
negative.code:   Assert.Equal(input, actual)
  
  [<Fact>]
  let ``builtin(string key)`` () =
  
    let input: Result<int, string> = Ok 1
    let actual = convert input
  