var coreJsData = require('./_coreJsData');

/** Used to detect methods masquerading as native. */ var maskSrcKey = (function() {

var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
return uid ? ('Symbol(src)_1.' + uid) : '';

}());

/**

* Checks if `func` has its source masked.
*
* @private
* @param {Function} func The function to check.
* @returns {boolean} Returns `true` if `func` is masked, else `false`.
*/

function isMasked(func) {

return !!maskSrcKey && (maskSrcKey in func);

}

module.exports = isMasked;