simp only [autoParam] at ha hb
α : Type u_1
as bs : Array α
start stop i : Nat
hstart : start ≤ stop
hstop : stop ≤ bs.size
hi : i < stop - start
ha : autoParam (as.size + i < (foldl push as bs start stop).size) _auto✝
hb : autoParam (start + i < bs.size) _auto✝
⊢ (foldl push as bs start stop)[as.size + i] = bs[start + i]
α : Type u_1
as bs : Array α
start stop i : Nat
hstart : start ≤ stop
hstop : stop ≤ bs.size
hi : i < stop - start
ha : as.size + i < (foldl push as bs start stop).size
hb : start + i < bs.size
⊢ (foldl push as bs start stop)[as.size + i] = bs[start + i]