use strict;
use warnings;
use Nice::Try;

{
  package MyException;
  use overload '""' => 'message';
  sub message { $_[0]->{message} }
  sub new { my $class = shift; bless { @_ }, $class }
  sub throw { my $class = shift; die $class->new(message => shift) }
}

try {
  MyException->throw("hi\n");
}
catch (MyException $e) {
  warn "working catch: $e";
}
catch ($e) {
  warn "broken catch: $e";
}
__END__
$ perl bad-exception.pl
broken catch: hi at bad-exception.pl line 21.