$ perl -wMstrict -le 'print Time::HiRes::gettimeofday()'
Undefined subroutine &Time::HiRes::gettimeofday called at -e line 1.
$ perl -wMstrict -le 'print Cwd::getcwd()'
Undefined subroutine &Cwd::getcwd called at -e line 1.
$ perl -wMstrict -le 'print utf8::valid("foo")'
1