Calls.arg: def of bolt@1.27.0.0
Import: import bolt@1.27.0.0/src/rules/calls.bend as Calls
Lines 109-117 of bolt@1.27.0.0/src/rules/calls.bend: https://jend.leeeet.dev/read.txt?path=bolt@1.27.0.0/src/rules/calls.bend&start_line=109&end_line=117

import Base
import bolt@1.27.0.0/src/syntax/tree.bend as Tree

# the nth argument, or nothing
def arg(as: List<&2, Tree.Node>, nn: Nat) -> Tree.Node:
  match as nn:
    case Con{h, t} 0n:
      h
    case Con{h, t} 1n+p:
      arg(t, p)
    case Nil{} m:
      Tree.NNil{}

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=Nat
  https://jend.leeeet.dev/definition.txt?path=bolt@1.27.0.0/src/syntax/tree.bend&name=Node