const VS features detection

Kevin Smith zenparsing at
Wed Jan 8 06:51:22 PST 2014

Since "do-as-IIFE" carries with it a subset of the semantics carried by
"do--as-block", I think it makes sense to proceed with the subset first,
and expand if "do-as-IIFE" turns out to be surprising or lacking.

IIUC, the goal here is to allow a sequence of statements to produce a
value, not (necessarily) to allow arbitrary block semantics.
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