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core-js/tests/unit-pure/es.function.has-instance.js

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JavaScript

import Symbol from 'core-js-pure/es/symbol';
QUnit.test('Function#@@hasInstance', assert => {
assert.true(Symbol.hasInstance in Function.prototype);
assert.true(Function[Symbol.hasInstance](() => { /* empty */ }));
assert.false(Function[Symbol.hasInstance]({}));
});