Doesn't work with interface file i.e. resi

[shulhi]

Example error thrown,

  Syntax error!
  <filename>/home/shulhi/Plow/all/re-react-onping-frontend/src/OnpingUi/OnpingUi_Toast.resi</filename>:<dim>120:58-122:1</dim>

  118 │
  119 │ @ocaml.doc(" Displays an error toast notification, returning the id of
      │  the toast ")
  120 │ let errorWithId: (~options: options=?, string) => toastId
  121 │
  122 │ @ocaml.doc(" Displays a dark toast notification, returning the id of t
      │ he toast ")
  123 │ let darkWithId: (~options: options=?, string) => toastId
  124 │

  Did you forget a `=` here?