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> type MyException1 () = 
    inherit Exception ()
    new (msg:string) = {inherit Exception(msg)}
;;
      new (msg:string) = {inherit Exception(msg)}
  -----------------------^^^^^^^^^^^^^^^^^^^^^^^^
stdin(9,24): error FS0762: Constructors for the type 'MyException1' must directly or indirectly call its implicit object constructor. Use a call to the implicit object constructor instead of a record expression.

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> type MyException =
    inherit Exception
    new () = {inherit Exception()}
    new (msg:string) = {inherit Exception(msg)}
;;