+{
+ local *x;
+
+ eval { localize_elem *x, 0, [ 1 ] };
+ like $@, $invalid_glob, 'invalid localize_elem *x, 0, [ 1 ]';
+}
+
+{
+ local *x;
+
+ eval { localize_elem *x, 0, { a => 1 } };
+ like $@, $invalid_glob, 'invalid localize_elem *x, 0, { a => 1 }';
+}
+
+{
+ local *x;
+
+ eval { localize_elem *x, 0, sub { } };
+ like $@, $invalid_glob, 'invalid localize_elem *x, 0, sub { }';
+}
+
+{
+ local *x;
+
+ eval { localize_elem *x, 0, *x };
+ like $@, $invalid_glob, 'invalid localize_elem *x, 0, *x';
+}
+
+sub invalid_ref { qr/^Invalid \Q$_[0]\E reference as the localization target/ }
+
+{
+ eval { localize_elem \1, 0, 0 => HERE };
+ like $@, invalid_ref('SCALAR'), 'invalid localize_elem \1, 0, 0 => HERE';
+}
+
+{
+ eval { localize_elem [ ], 0, 0 => HERE };
+ like $@, invalid_ref('ARRAY'), 'invalid localize_elem [ ], 0, 0 => HERE';
+}
+
+{
+ eval { localize_elem { }, 0, 0 => HERE };
+ like $@, invalid_ref('HASH'), 'invalid localize_elem { }, 0, 0 => HERE';
+}
+
+{
+ eval { localize_elem sub { }, 0, 0 => HERE };
+ like $@, invalid_ref('CODE'), 'invalid localize_elem sub { }, 0, 0 => HERE';
+}