it says that all local and global vars will be defined in the eval space
$self is not local or global, it's a lexical variable!... though, I recall seing some patch for this in p5p, maybe its supported in the development version of perl (currently 5.9.2).
Anyway, you don't need eval for what you are trying to do, use
$method_name="foo";
$self->$method_name(@args);
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