'use strict'; 
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// https://github.com/tc39/proposal-async-explicit-resource-management 
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var call = require('../internals/function-call'); 
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var defineBuiltIn = require('../internals/define-built-in'); 
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var getBuiltIn = require('../internals/get-built-in'); 
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var getMethod = require('../internals/get-method'); 
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var hasOwn = require('../internals/has-own-property'); 
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var wellKnownSymbol = require('../internals/well-known-symbol'); 
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var AsyncIteratorPrototype = require('../internals/async-iterator-prototype'); 
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var ASYNC_DISPOSE = wellKnownSymbol('asyncDispose'); 
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var Promise = getBuiltIn('Promise'); 
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if (!hasOwn(AsyncIteratorPrototype, ASYNC_DISPOSE)) { 
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  defineBuiltIn(AsyncIteratorPrototype, ASYNC_DISPOSE, function () { 
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    var O = this; 
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    return new Promise(function (resolve, reject) { 
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      var $return = getMethod(O, 'return'); 
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      if ($return) { 
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        Promise.resolve(call($return, O)).then(function () { 
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          resolve(undefined); 
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        }, reject); 
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      } else resolve(undefined); 
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    }); 
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  }); 
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} 
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