Elimination of accidentally quadratic/maybe exponential (https://docs.google.com/spreadsheets/d/1mASN4BB3IAd5ZLQR5dz0Tzx2Yl-w4g5VUjz3bgd5kD4/edit?usp=sharing) negative-look-ahead in `stab` (`do` or `fn` body) parsing that led to slow parsing and slow reparse on hitting Enter.
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