I just found some issues in R7RS draft 8 section 7.1.1
But these productions have two issues:
1. Having <symbol element> list double-quote is pointless, since that
is already covered by "<any character other than <vertical line> or \>".
2. More importantly, the call to <string element> creates a useless
ambiguity, because string element's <any character other than " or \>
ALSO matches almost all the same characters.
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