patch 8.2.2533: Vim9: cannot use a range with :unlet
Problem: Vim9: cannot use a range with :unlet.
Solution: Implement ISN_UNLETRANGE.
diff --git a/src/proto/evalvars.pro b/src/proto/evalvars.pro
index 144dc7c..cf4db0b 100644
--- a/src/proto/evalvars.pro
+++ b/src/proto/evalvars.pro
@@ -23,6 +23,7 @@
void ex_unlet(exarg_T *eap);
void ex_lockvar(exarg_T *eap);
void ex_unletlock(exarg_T *eap, char_u *argstart, int deep, int glv_flags, int (*callback)(lval_T *, char_u *, exarg_T *, int, void *), void *cookie);
+int list_unlet_range(list_T *l, listitem_T *li_first, char_u *name, long n1_arg, int has_n2, long n2);
int do_unlet(char_u *name, int forceit);
void item_lock(typval_T *tv, int deep, int lock, int check_refcount);
void del_menutrans_vars(void);