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[Scheme-reports] Error in comment syntax grammar

Very minor point that popped out when I was implementing a grammar parser for fun this evening. On page 49, the grammar for commenting out datums is written as

#; <atmosphere> <datum>

However, <atmosphere> contains <whitespace> which contains newlines, so that doesn't look correct.

(foo) <-- commented out by current grammar. Hmm...

 If you still want to allow nested comments in the atmosphere portion there

#; #| first
       second |# (foo)   <-- commented out

then maybe it needs a variant on <atmosphere> without newlines.

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