t/op/tiearray.t See if tie for arrays works
t/op/tiehandle.t See if tie for handles works
t/op/tie.t See if tie/untie functions work
+t/op/time_loop.t Test that very large values don't hang gmtime and localtime.
t/op/time.t See if time functions work
t/op/tr.t See if tr works
t/op/undef.t See if undef works