Par.job.fields: def of snap@1.4.0.0
Import: import snap@1.4.0.0/src/par.bend as Par
Lines 8-17 of snap@1.4.0.0/src/par.bend: https://jend.leeeet.dev/read.txt?path=snap@1.4.0.0/src/par.bend&start_line=8&end_line=17

import Base

# one job's fields on the `par` wire: each argument marked with a `+` in
# front, then an empty field that ends the job. A marked field is never empty,
# so the empty one cannot be mistaken for an argument, whatever the arguments
# hold; and the empty job is the empty field alone.
def job.fields(argv: List<&2, String>) -> List<&2, String>:
  match argv:
    case []:
      [""]
    case arg <> rest:
      ("+" ++ arg) <> job.fields(rest)

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.append