def parse.step
import bend-kit-regex@0.8.0.0/regex.bend as Regeximport Base
516def parse.step(st: Ps, tok: Tok) -> Ps:
517 match st:
518 case PsFail{}:
519 PsFail{}
520 case Ps{n, rep, stack, alts, cur}:
521 parse.tok(tok, n, rep, stack, alts, cur)