vm_eval.c: hide intermediate hash

* vm_eval.c (rb_f_local_variables): hide intermediate hash and use
  rb_hash_keys() directly.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45857 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

vm_eval.c

@@ -1918,6 +1918,7 @@ rb_f_local_variables(void)
 
     vars.tbl = rb_hash_new();
     RHASH(vars.tbl)->ntbl = st_init_numtable(); /* compare_by_identity */
+    RBASIC_CLEAR_CLASS(vars.tbl);
     while (cfp) {
 	if (cfp->iseq) {
 	    for (i = 0; i < cfp->iseq->local_table_size; i++) {
@@ -1941,9 +1942,8 @@ rb_f_local_variables(void)
 	    break;
 	}
     }
-    /* TODO: rb_hash_keys() directly, or something not to depend on
-     * the order of st_table */
-    ary = rb_funcallv(vars.tbl, rb_intern("keys"), 0, 0);
+    /* TODO: not to depend on the order of st_table */
+    ary = rb_hash_keys(vars.tbl);
     rb_hash_clear(vars.tbl);
     return ary;
 }