fix(parser) prevent gobbling of illegal newlines #4142
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Fixes #4101.
Changes
In case
illegal
detects a 0 width match the only case that can happen is a $ matching right before a newline, so we now not only add 1 (so the parser keeps going) but we also inject the\n
back into themodeBuffer
.The only other case might be if someone is using look-ahead in a illegal, and we'll simply say that is not-necessary and also not supported.
Checklist
CHANGES.md