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'use strict';
var noop = require('async.util.noop');
var restParam = require('async.util.restparam');
module.exports = function whilst(test, iterator, cb) {
cb = cb || noop;
if (!test()) return cb(null);
var next = restParam(function(err, args) {
if (err) return cb(err);
if (test.apply(this, args)) return iterator(next);
cb.apply(null, [null].concat(args));
});
iterator(next);
};
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