cases (Partial.mem_iff.mp e.allows_rcn.mem).choose_spec ▸ ht e.rcn
α : Type
inst✝ : Proper α
s s₁ s₂ : State α
e : s₁ ↓ₛ s₂
ht : ∀ (a : Component.idType Component.rcn), s₁.rtr[Component.rcn][a] = none
⊢ False
no goals