-However, one of the helper functions that *it* calls is `free_in (ident : identifier) (term : term) : bool`, and this was a function that you did [[write for an earlier homework|/exercises/assignment5/#occurs_free]]. Hence we asked you to adapt your implementation of that to the term datatype used in this interpreter. Here is a skeleton of this function:
+However, one of the helper functions that *it* calls is `free_in (ident : identifier) (term : term) : bool`, and this was a function that you did [[write for an earlier homework|/exercises/assignment5-6#occurs_free]]. Hence we asked you to adapt your implementation of that to the term datatype used in this interpreter. Here is a skeleton of this function: