Hdr.fields.cut.if: def of bend-toon-codec@0.1.0.0
Import: import bend-toon-codec@0.1.0.0/src/hdr.bend as Hdr
Lines 91-96 of bend-toon-codec@0.1.0.0/src/hdr.bend: https://jend.leeeet.dev/read.txt?path=bend-toon-codec@0.1.0.0/src/hdr.bend&start_line=91&end_line=96

import Base

def fields.cut.if(+missing: Bool, +n: U32, +d: U32, +s: String, +i: U32) -> Result<&2, &2, String, Hdr>:
  match missing:
    case True{}:
      bad("unterminated field list")
    case False{}:
      fields.after(n, d, String.take(s, U32.to_nat(i)), String.drop(s, U32.to_nat((i + 1 : U32))))

Uses (11):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Result
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.drop
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.take
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/hdr.bend&name=Hdr
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/hdr.bend&name=bad
  https://jend.leeeet.dev/definition.txt?path=bend-toon-codec@0.1.0.0/src/hdr.bend&name=fields.after