simp
case mpr
α : Type u
inst✝ : DecidableEq α
a : α
as : Array α
h : ∃ n, List.get as.data n = a
⊢ (∃ n, List.get as.data n = a) ∧ decide (a = a) = true
case mpr
α : Type u
inst✝ : DecidableEq α
a : α
as : Array α
h : ∃ n, List.get as.data n = a
⊢ ∃ n, List.get as.data n = a