can not pass open formal type parameter to inherited feature

[michaellilltokiwa]

I think this could/should work but gives an error currently.

/home/not_synced/fuzion (2024-07-02T11-18-09+02-00)1$ cat ~/playground/test.fz
ex =>
  public either(public LEFT type, public RIGHT type...) : choice LEFT RIGHT is


/home/not_synced/fuzion (2024-07-02T11-18-09+02-00)$ make no-java && fz ~/playground/test.fz 

/home/sam/playground/test.fz:2:71: error 1: Illegal use of open formal type parameter type
  public either(public LEFT type, public RIGHT type...) : choice LEFT RIGHT is
----------------------------------------------------------------------^^^^^
Open formal type parameter type is permitted only as the type of the last argument in a formal arguments list of an abstract feature.
Open formal argument: 'RIGHT'

one error.