[NFC] Return optional in Lexer::peek#8737
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Fix an OOB string_view access that was just trying to get a one-past-the-end pointer. Fix two locations where we could have been peeking empty input. Fixes #8732.
This prevents errors where we peek the buffer without checking that there is more input to peek at.
tlively
requested review from
aheejin and
stevenfontanella
and removed request for
a team
stevenfontanella
approved these changes
May 20, 2026
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This prevents errors where we peek the buffer without checking that there is more input to peek at.