[Scheme-reports] 7.1.1 lexical structure

[Andy Wingo <wingo@x>]

WHITESPACE is specified as SPACE OR NEWLINE.  Should TAB be included?
LF?  Some unicode category?

What is the deal with PECULIAR IDENTIFIER?  Is +.+ useful for someone?
It seems an odd production, given that implementations are free to
extend the set of valid identifiers.  The R5RS was clearer here.

I am bothered by the SYNTACTIC KEYWORD section.  Whether or not
something is a keyword depends on scope; only sometimes does it only
depend on name.

Do people really use the #-is-a-placeholder-digit thing?  Yuk!  This
should be allowed (as any implementation extension would be) but not
required.

The INFINITY -> +nan.0 seems a bit sloppy, naming-wise.

Why call expressions COMMANDs when they are in PROGRAMs?  "Expression"
entails the possibility of a side-effect, if that was the intention.

Also, DEFINITION -> (begin DEFINITION*); this does not allow

  (begin (begin (define a 1) a))

Andy
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