∀ {α : Type u_6} {β : Type u_7} {inst : Top α} {inst_1 : Top β} {toFun : α → β} {map_top' : toFun ⊤ = ⊤}
  {toFun_1 : α → β} {map_top'_1 : toFun_1 ⊤ = ⊤},
  { toFun := toFun, map_top' := map_top' } = { toFun := toFun_1, map_top' := map_top'_1 } → toFun = toFun_1