Real world examples of Ecmascript functions returning a Reference?

Posted by Bergi on Stack Overflow See other posts from Stack Overflow or by Bergi
Published on 2012-10-29T15:14:41Z Indexed on 2012/10/30 17:01 UTC
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Read the EcmaScript specification, section 8.7 The Reference Specification Type:

The Reference type is used to explain the behaviour of such operators as delete, typeof, and the assignment operators. […] A Reference is a resolved name binding.

Function calls are permitted to return references. This possibility is admitted purely for the sake of host objects. No built-in ECMAScript function defined by this specification returns a reference and there is no provision for a user-defined function to return a reference.

Those last two sentences impressed me. With this, you could do things like coolHostFn() = value (valid syntax, btw). So my question is:

Are there any EcmaScript implementations that define host function objects which result in Reference values?

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