Set: pp::colors
  Set: pp::unicode
  Assumed: Eq
  Assumed: EqSubst
  Assumed: EqRefl
  Proved: EqSymm
  Proved: EqTrans
  Proved: EqCongr
  Proved: EqCongr1
  Assumed: ProofIrrelevance
  Assumed: EqCast
  Assumed: EqCastHom
  Assumed: EqCastRefl
  Assumed: Vector
  Assumed: empty
  Assumed: append
  Assumed: Plus0
  Proved: VectorPlus0
  Set: lean::pp::implicit
  Assumed: AppendNil
  Assumed: List
  Assumed: A
  Assumed: B
  Assumed: H1
  Proved: LAB
  Assumed: l1
  Assumed: l2
  Assumed: H2