ProofBase.tail: def of lawful-arrays@0.1.0.0
Import: import lawful-arrays@0.1.0.0/proof_base.bend as ProofBase
Lines 441-446 of lawful-arrays@0.1.0.0/proof_base.bend: https://jend.leeeet.dev/read.txt?path=lawful-arrays@0.1.0.0/proof_base.bend&start_line=441&end_line=446

import Base

def tail(-A: Data, xs: List<&2, A>) -> List<&2, A>:
  match xs:
    case Nil{}:
      Nil{}
    case h <> t:
      t

Uses (1):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List