patch 8.1.0888: the a: dict is not immutable as documented
Problem: The a: dict is not immutable as documented.
Solution: Make the a:dict immutable, add a test. (Ozaki Kiichi, Yasuhiro
Matsumoto, closes #3929)
diff --git a/src/userfunc.c b/src/userfunc.c
index acbab90..d1ea33a 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -772,7 +772,7 @@
v = &fc->fixvar[fixvar_idx++].var;
name = v->di_key;
STRCPY(name, "self");
- v->di_flags = DI_FLAGS_RO + DI_FLAGS_FIX;
+ v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
hash_add(&fc->l_vars.dv_hashtab, DI2HIKEY(v));
v->di_tv.v_type = VAR_DICT;
v->di_tv.v_lock = 0;
@@ -788,6 +788,7 @@
init_var_dict(&fc->l_avars, &fc->l_avars_var, VAR_SCOPE);
add_nr_var(&fc->l_avars, &fc->fixvar[fixvar_idx++].var, "0",
(varnumber_T)(argcount - fp->uf_args.ga_len));
+ fc->l_avars.dv_lock = VAR_FIXED;
/* Use "name" to avoid a warning from some compiler that checks the
* destination size. */
v = &fc->fixvar[fixvar_idx++].var;