Thanks Kristoffer. AFAIU these are not supposed to be used in user code. 
However, the follow up question is what is a meta node?

On Monday, May 30, 2016 at 5:21:02 PM UTC+1, Kristoffer Carlsson wrote:
>
> I believe they insert the corresponding Meta node into the AST before the 
> actual macros (like @inline) have been defined.

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