def head.check
import yaml-for-bend@0.1.1.0/scan.bend as Scanimport Base
997def head.check(chomp: Chomp, +inc: Nat, +cur: Cur) -> Head:
998 Bool.pick(Head, is_breakz(peek(cur.s(cur), 0n)), Head{chomp, inc, adv(cur)}, HeadBad{"did not find expected comment or line break while scanning a block scalar"})