>/ Brandon Benvie <mailto:bbenvie at mozilla.com
<https://mail.mozilla.org/listinfo/es-discuss>>
/>/ September 30, 2013 8:48 PM
/>/ I'm actually now really curious what the following does:
/>/
/>/ ```
/>/ function foo(x, y = (() => { arguments[0] = "foo"; return "bar" })()) {
/>/ return [x, y];
/>/ }
/
Easy: arguments is an early error in the body of an arrow.
http://wiki.ecmascript.org/doku.php?id=harmony:arrow_function_syntax
/be
This restriction is not specified in the rev19 draft. Currently arrow
functions don't have an own `arguments` binding, but instead access the
outer functions `arguments` object, similar to `this`. Disallowing the
identifier "arguments" in PrimaryExpressions also should imply
disallowing "arguments" as a BindingIdentifier, which shifts arrow
functions again into "almost strict-mode".
- André
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