rfl
case h.d.h
α qs : Type
inst✝¹ : DecidableEq α
inst✝ : DecidableEq qs
M : DFA α qs
a✝ : Word { x // x ∈ (toGrammar M).Z }
h : a✝ ∈ Grammar.GeneratedLanguage (toGrammar M)
d : Grammar.Derivation (toGrammar M) [Sum.inl (toGrammar M).start] (Sum.inr <$> a✝)
⊢ Sum.inr <$> a✝ = Sum.inr <$> a✝
no goals