patch 8.2.1698: cannot lock a variable in legacy Vim script like in Vim9
Problem: Cannot lock a variable in legacy Vim script like in Vim9.
Solution: Make ":lockvar 0" work.
diff --git a/src/proto/evalvars.pro b/src/proto/evalvars.pro
index 010e630..569a73a 100644
--- a/src/proto/evalvars.pro
+++ b/src/proto/evalvars.pro
@@ -68,9 +68,10 @@
void set_var(char_u *name, typval_T *tv, int copy);
void set_var_const(char_u *name, type_T *type, typval_T *tv_arg, int copy, int flags);
int var_check_ro(int flags, char_u *name, int use_gettext);
+int var_check_lock(int flags, char_u *name, int use_gettext);
int var_check_fixed(int flags, char_u *name, int use_gettext);
int var_wrong_func_name(char_u *name, int new_var);
-int var_check_lock(int lock, char_u *name, int use_gettext);
+int value_check_lock(int lock, char_u *name, int use_gettext);
int valid_varname(char_u *varname);
void reset_v_option_vars(void);
void assert_error(garray_T *gap);