Args.split: def of ezx@1.11.0.0
Import: import ezx@1.11.0.0/src/share/args.bend as Args
Lines 39-46 of ezx@1.11.0.0/src/share/args.bend: https://jend.leeeet.dev/read.txt?path=ezx@1.11.0.0/src/share/args.bend&start_line=39&end_line=46

import Base

# the first argument and the ones after it. The pair is returned rather than
# asked about twice, since a match cannot scrutinise a local binder.
def split(xs: List<&2, String>) -> String & List<&2, String>:
  match xs:
    case Nil{}:
      ("", Nil{})
    case Con{h, t}:
      (h, t)

Uses (4):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String