how about using something like Class::Can? 
my $obj = bless {}, 'Bar';
$obj->violation;

package Bar;
use Class::Can;

CHECK {
    ## See what UNIVERSAL can do..
    my %uni_can = Class::Can->interrogate('UNIVERSAL');

    ## These are ok..
    delete $uni_can{$_} foreach qw( can isa VERSION );

    ## Anything left is not ok..
    my @bad_methods = keys %uni_can;

    foreach my $method ( @bad_methods ) {
        *{ __PACKAGE__ . "::$method" } = sub {
            die "UNIVERSAL::$method not allowed";
        };
    }

}

package UNIVERSAL;
sub violation { print "haha, a violation\n"; }

[download]
it's not perfect. someone can put methods into UNIVERSAL that 'override' Bar's methods, so maybe you want to expand the 'ok' list to those methods declared by package Bar. there's probably another gotcha or two this doesn't account for, but it's a start..

In reply to Re: ->isn't('UNIVERSAL') - stopping UNIVERSAL pollution? by mreece
in thread ->isn't('UNIVERSAL') - stopping UNIVERSAL pollution? by diotalevi

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.