t/op/int.t See if int works
t/op/join.t See if join works
t/op/lc.t See if lc, uc, lcfirst, ucfirst, quotemeta work
+t/op/lc_user.t See if user-defined lc et alia work
t/op/length.t See if length works
t/op/lex_assign.t See if ops involving lexicals or pad temps work
t/op/lfs.t See if large files work for perlio