| Fold of loc * reduction_kind * 'term
| Fourier of loc
| Goal of loc * int (* change current goal, argument is goal number 1-based *)
- | Hint of loc
| Injection of loc * 'ident
| Intros of loc * int option * 'ident list
| Left of loc
| Abort of loc
| Print of loc * string
| Check of loc * 'term
+ | Hint of loc
| Quit of loc
| Redo of loc * int option
| Undo of loc * int option