parsing [foo]: selectors versus variables

[Paul Dufresne]

Suppose you parse [foo]. Should foo seen as a selector send to the current 
context, or
a variable. I guess the answer depends on the fact that a variable named foo 
exist.

If a variable foo exist, to what kind of Node should it parse to?

I wonder if a different syntax should not be used for variables, at least, 
for bootstrapping,
that would make the parser simpler.

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