case final         => exact ⟨_, get?_some_to_obj?_some ‹_›⟩
α : Type
inst✝ : Hierarchical α
rtr₁ : α
cpt : Component.Valued
i : ID
v : Value
rtr₂ rtr₁✝ rtr₂✝ : α
o✝ : Component.type α (Component.val cpt)
a✝² : rtr₁✝ ≃[Component.val cpt][i] rtr₂✝
a✝¹ : rtr₁✝{Component.val cpt}{i} = some o✝
a✝ : rtr₂✝{Component.val cpt}{i} = some v
⊢ ∃ o, rtr₂✝[Component.val cpt][i] = some o
no goals