vim-patch:8.2.0876: :pwd does not give a hint about the scope of the directory

Problem:    :pwd does not give a hint about the scope of the directory
Solution:   Make ":verbose pwd" show the scope. (Takuya Fujiwara, closes vim/vim#5469)
950587242c

src/nvim/eval/funcs.c

@@ -1073,6 +1073,8 @@ static void f_chdir(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   rettv->vval.v_string = NULL;
 
   if (argvars[0].v_type != VAR_STRING) {
+    // Returning an empty string means it failed.
+    // No error message, for historic reasons.
     return;
   }