1  var coreJsData = require('./_coreJsData');
 2  
 3  /** Used to detect methods masquerading as native. */
 4  var maskSrcKey = (function() {
 5    var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
 6    return uid ? ('Symbol(src)_1.' + uid) : '';
 7  }());
 8  
 9  /**
10   * Checks if `func` has its source masked.
11   *
12   * @private
13   * @param {Function} func The function to check.
14   * @returns {boolean} Returns `true` if `func` is masked, else `false`.
15   */
16  function isMasked(func) {
17    return !!maskSrcKey && (maskSrcKey in func);
18  }
19  
20  module.exports = isMasked;