With the included file in the current working directory...

First, byte compile the file:
    emacs -Q -batch --eval '(byte-compile-file "pacproxy.el")'

Then, from 
    emacs -Q

    M-: (push default-directory load-path) RET
    M-x load-library RET pacproxy RET

For me, this results in the following warning:

    Warning (comp): /home/md5i/tmp/tmp/pacproxy.el: Error: Assertion failed (and (< idx (comp-vec-end vec)) (>= idx (comp-vec-beg vec)))