t/op/sub.t See if subroutines work
t/op/sysio.t See if sysread and syswrite work
t/op/taint.t See if tainting works
+t/op/threads.t Misc. tests for perl features with threads
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