You cannot generally wrap a callback interface with a looping interface unless you have continuations, co-routines, or some other similar construct. Perl does not. (Well, there is a module that adds it, but I'm not sure what issues it has. Certainly it isn't a built-in feature.)
Whether it is good for a language to have continuations is another debate, and there are top-notch people who'll argue both sides of that choice.
Regardless, Perl 6 will have continuations.
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