renamed test case

--HG--
rename : tests/run/extended_unpacking_T466.pyx => tests/run/cascaded_typed_assignments_T466.pyx

diff --git a/tests/run/extended_unpacking_T466.pyx b/tests/run/cascaded_typed_assignments_T466.pyx
similarity index 100%
rename from tests/run/extended_unpacking_T466.pyx
rename to tests/run/cascaded_typed_assignments_T466.pyx