$ perl -e'BEGIN{ *CORE::GLOBAL::use = sub{1};} use CGI qw/:standard/; print header'
Content-Type: text/html; charset=ISO-8859-1

$ 

##</code><code>##

$ perl -e'use Fatal qw/use/;'
Cannot make a non-overridable builtin fatal at /usr/lib/perl5/5.8.4/Fatal.pm line 108.
BEGIN failed--compilation aborted at -e line 1.
$