Doesn't run for me:

Global symbol "$x" requires explicit package name at ./y line 8.
Global symbol "$x" requires explicit package name at ./y line 8.
Global symbol "$y" requires explicit package name at ./y line 8.
Global symbol "$y" requires explicit package name at ./y line 9.
Global symbol "$x" requires explicit package name at ./y line 9.
Global symbol "$y" requires explicit package name at ./y line 9.
Execution of ./y aborted due to compilation errors.
[download]

Running it without the use strict does work