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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [JSC] ArrowFormalParameters and MethodDefinition parameters do not use StrictFormalParameters restrictions"
href="https://bugs.webkit.org/show_bug.cgi?id=161408">161408</a>
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<th>Summary</th>
<td>[JSC] ArrowFormalParameters and MethodDefinition parameters do not use StrictFormalParameters restrictions
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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
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>JavaScriptCore
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>caitp@igalia.com
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<p>
<div>
<pre>ArrowFormalParameters and MethodDefinition parameters should be parsed according to the StrictFormalParameters production (<a href="https://tc39.github.io/ecma262/#sec-arrow-function-definitions">https://tc39.github.io/ecma262/#sec-arrow-function-definitions</a>, <a href="https://tc39.github.io/ecma262/#prod-MethodDefinition">https://tc39.github.io/ecma262/#prod-MethodDefinition</a>).
Per <a href="https://tc39.github.io/ecma262/#sec-function-definitions-static-semantics-early-errors">https://tc39.github.io/ecma262/#sec-function-definitions-static-semantics-early-errors</a>, these functions should not parse successfully when there are duplicate formal parameters.
E.g.
var f = (a, a) => 1 /* should be SyntaxError */
var O = {
m(a, a) { return 1; } /* should be SyntaxError */
};</pre>
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