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 # common, clean, readable, OO-ish way
 $foo->bar ( 'bash' );

 # less common, probably less readable, way
 Foo::bar ( $foo, 'bash' );

# from 5.6.1's Socket.pm on Linux 2.4
sub AUTOLOAD {
...
    eval "sub $AUTOLOAD () { $val }";
    goto &$AUTOLOAD;
}

package MessageLibrary;
use ...
...
}

1;