Also, there is one other thing that is an lvalue in VC#, though it's a language extension - __argvalue().
That was the only Google result for __argvalue.
I tried it in LINQPad and it doesn't seem to exist.
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SLaks
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4No, this StackOverflow post also appears in Google when searching for "`__argvalue`". :-) – jason Nov 20 '09 at 14:43
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1I was waiting for someone to say that. – SLaks Nov 20 '09 at 14:45
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Yeah, Visual Studio recognises the other "secret" C# keywords that I know of - `__arglist`, `__makeref`, `__reftype` and `__refvalue` - and highlights them like any other. No such luck with `__argvalue` though. – LukeH Nov 20 '09 at 15:06
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3Pavel clearly meant __arglist. I'll fix the typo. – Eric Lippert Nov 20 '09 at 17:03
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1How can `__arglist` be an lvalue? – SLaks Nov 20 '09 at 17:14
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I can definitively state that there is no __argvalue in C# as of .NET Framework 4.0. The compiler binary contains a table of tokens. You can find the other hidden __ prefixed keywords starting at 0x00009840. However, a search of the entire binary shows that there is no __argvalue token.
The author of that comment may have been referring to __arglist, which can be an lvalue.
David Pfeffer
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