'use strict'
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								/* eslint-disable no-var */
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								var queue = require('./')(worker, 1)
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								queue.push(42, function (err, result) {
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								  if (err) { throw err }
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								  console.log('the result is', result)
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								})
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								function worker (arg, cb) {
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								  cb(null, 42 * 2)
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								}
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