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    #!/usr/local/bin/perl

...
my $class = undef;

eval {  $class->isa('MyClass'); };
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    Can't call method "isa" on an undefined value at /home/chrisgrafham/ho
+spital/cgi-bin/testEval.pl line 13.
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    Can't call method "isa" on an undefined value at /home/fred/..../cgi-b
+in/testEval.pl line 13