case final.nested h₁ _ _ _ _ u h₂ _ _ =>
  injection (StrictMember.final h₁).unique (u.member₁.nested h₂)
α : Type
inst✝ : Readable α
rtr rtr₁ : α
cpt : Component.Valued
i : ID
v : Value
rtr₁✝ rtr₂✝ : α
o✝ : Component.type α (Component.val cpt)
a✝³ : rtr₁✝ ≃[Component.val cpt][i] rtr₂✝
h₁ : rtr₁✝{Component.val cpt}{i} = some o✝
a✝² : rtr₂✝{Component.val cpt}{i} = some v
rtr₂ : α
j✝ : ID
n₁✝ n₂✝ : Component.type α Component.rtr
u : LawfulMemUpdate cpt i v n₁✝ n₂✝
h₂ : rtr₁✝{Component.rtr}{j✝} = some n₁✝
a✝¹ : rtr₂{Component.rtr}{j✝} = some n₂✝
a✝ : rtr₁✝ ≃[Component.rtr][j✝] rtr₂
⊢ rtr₂✝ = rtr₂
no goals