case refl.refl.refl.refl => rfl
α : Type
inst✝ : Proper α
s s₁ s₁₂ : State α
c : Change
out out₁ : Reaction.Output
ht : Disjoint (Reaction.Output.targets []) (Reaction.Output.targets [])
⊢ s₁₂ = s₁₂
no goals