Arc.all_in: def of near-architecture@0.9.1.0
Import: import near-architecture@0.9.1.0/arc.bend as Arc
Lines 345-351 of near-architecture@0.9.1.0/arc.bend: https://jend.leeeet.dev/read.txt?path=near-architecture@0.9.1.0/arc.bend&start_line=345&end_line=351

import Base

# Every key in `xs` names something in `ks`.
def all_in(xs: List<&2, String>, +ks: List<&2, String>) -> Bool:
  match xs:
    case []:
      True{}
    case x <> rest:
      has(x, ks) && all_in(rest, ks)

Uses (5):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  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=near-architecture@0.9.1.0/arc.bend&name=has