#!/usr/local/bin/perl

use strict;
use warnings;

my $class = undef;

eval {  $class->isa('MyClass'); };

##</code><code>##

Can't call method "isa" on an undefined value at /home/chrisgrafham/hospital/cgi-bin/testEval.pl line 13.

##</code><code>##

Can't call method "isa" on an undefined value at /home/fred/..../cgi-bin/testEval.pl line 13