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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - ES6 classes: When a class extends B, super() invokes B.prototype.constructor() instead of B()"
href="https://bugs.webkit.org/show_bug.cgi?id=149001">149001</a>
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<th>Summary</th>
<td>ES6 classes: When a class extends B, super() invokes B.prototype.constructor() instead of B()
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>WebKit Nightly Build
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>JavaScriptCore
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>claude.pache@gmail.com
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<p>
<div>
<pre>Testcase:
```js
var called = null
class B { constructor() { called = 'B' } }
class C extends B {}
B.prototype.constructor = function F() { called = 'F' }
new C
called // should be 'B', is 'F'
```
It seems to me that JSC follows an old drafted semantics of `super()`, when it was equivalent to `super.constructor()`.
For reference, see the runtime semantics of `SuperCall : super Arguments` in the final spec:
<a href="http://www.ecma-international.org/ecma-262/6.0/#sec-super-keyword-runtime-semantics-evaluation">http://www.ecma-international.org/ecma-262/6.0/#sec-super-keyword-runtime-semantics-evaluation</a>
and pay attention to the definition of GetSuperConstructor():
<a href="http://www.ecma-international.org/ecma-262/6.0/#sec-getsuperconstructor">http://www.ecma-international.org/ecma-262/6.0/#sec-getsuperconstructor</a></pre>
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