const VS features detection

Kevin Smith zenparsing at
Thu Jan 9 09:35:12 PST 2014

> I do have one usability concern with arrow IIFEs. I hate when I see them
> written as ()=>{...whatever...}() because you don't know that it's an IIFE
> until the end. Function expressions have the same issue. We should adapt
> Crock's recommended paren style to arrow IIFEs, to whit
> (()=>{...whatever...}()), even though this looses a bit more brevity.
I believe this is required by the grammar anyway.
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