Csv.start.sp: def of bend-kit-csv@0.3.0.0
Import: import bend-kit-csv@0.3.0.0/csv.bend as Csv
Lines 52-58 of bend-kit-csv@0.3.0.0/csv.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-csv@0.3.0.0/csv.bend&start_line=52&end_line=58

import Base

# An empty line has no fields; a trailing comma adds an empty field.
def start.sp(sp: List<&2, Span>, +i: U32) -> List<&2, Span>:
  match sp:
    case Nil{}:
      Nil{}
    case Con{h, t}:
      Span{i, i, False{}} <> Con{h, t}

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=bend-kit-csv@0.3.0.0/csv.bend&name=Span