Semicolon after use strict!

If you forget the semicolon after the use strict, in older perls (5.6 or 5.005) it will just do nothing silently, and strict does not come into effect. In newer perls, you are likely to get an error, but not always. That's because the next expression is taken as an argument of use strict. (Useing strict without a semicolon was a useful obfu technique seen in many older obfus. Those now don't work with newer perls.)