fixes #28: allow anonymous well-known intrinsic objects

Author: michaelficarra

proposal.html

@@ -555,7 +555,7 @@ <h1>(<emu-xref href="#sec-function.prototype.tostring">19.2.3.5</emu-xref>) Func
 
   <ins class="block">
     <emu-alg>
-      1. If _func_ is a <emu-xref href="#sec-bound-function-exotic-objects">Bound Function exotic object</emu-xref> or a <emu-xref href="#sec-ecmascript-standard-built-in-objects">built-in Function object</emu-xref>, then return an implementation-dependent String source code representation of _func_. The representation must have the syntax of a |NativeFunction|. Additionally, if _func_ is a <emu-xref href="#sec-well-known-intrinsic-objects">Well-known Intrinsic Object</emu-xref>, the portion of the returned String that would be matched by |IdentifierName| must be the initial value of the *name* property of _func_.
+      1. If _func_ is a <emu-xref href="#sec-bound-function-exotic-objects">Bound Function exotic object</emu-xref> or a <emu-xref href="#sec-ecmascript-standard-built-in-objects">built-in Function object</emu-xref>, then return an implementation-dependent String source code representation of _func_. The representation must have the syntax of a |NativeFunction|. Additionally, if _func_ is a <emu-xref href="#sec-well-known-intrinsic-objects">Well-known Intrinsic Object</emu-xref> and is not identified as an anonymous function, the portion of the returned String that would be matched by |IdentifierName| must be the initial value of the *name* property of _func_.
       1. If _func_ has a [[SourceText]] internal slot and Type(_func_.[[SourceText]]) is String and ! HostHasSourceTextAvailable(_func_) is *true*, then return _func_.[[SourceText]].
       1. If Type(_func_) is Object and IsCallable(_func_) is *true*, then return an implementation-dependent String source code representation of _func_. The representation must have the syntax of a |NativeFunction|.
       1. Throw a *TypeError* exception.