∀ (seen : Lean.ExprSet) (consts : Lean.NameSet) (seen_1 : Lean.ExprSet) (consts_1 : Lean.NameSet),
  ({ seen := seen, consts := consts } = { seen := seen_1, consts := consts_1 }) = (seen = seen_1 ∧ consts = consts_1)