This is what happens to a record with an [<Obsolete>] field

Obsolete.log

      { Wanted = String.Empty
  ----^

stdin(8,5): warning FS0044: This construct is deprecated. Use 'Wanted' instead


      { Wanted = String.Empty
  ----^

stdin(8,5): warning FS0044: This construct is deprecated. Use 'Wanted' instead

    let r2 = { R.Create() with Wanted = s }
  -----------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

stdin(14,12): warning FS0044: This construct is deprecated. Use 'Wanted' instead


    let r3 = { R.Create() with Unwanted = s }
  -----------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

stdin(16,12): warning FS0044: This construct is deprecated. Use 'Wanted' instead


    let r3 = { R.Create() with Unwanted = s }
  -----------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

stdin(16,12): warning FS0044: This construct is deprecated. Use 'Wanted' instead

{Wanted = "";
 Unwanted = "";}
{Wanted = "is this wanted?";
 Unwanted = "";}
{Wanted = "";
 Unwanted = "is this wanted?";}
type R =
  {Wanted: System.String;
   Unwanted: System.String;}
  with
    static member Create : unit -> R
  end
val UseR : s:System.String -> unit
val it : unit = ()