intro h
sat? : Bool
aig : AIG Nat
start : Nat
h1 : start < aig.decls.size
assign1 : Nat → Bool
⊢ (⟦{ aig := aig, ref := { gate := start, hgate := h1 } }, assign1⟧ &&
        (go aig start h1 (State.empty aig)).val.eval (cnfSatAssignment aig assign1)) =
      sat? →
    ⟦{ aig := aig, ref := { gate := start, hgate := h1 } }, assign1⟧ = sat?
sat? : Bool
aig : AIG Nat
start : Nat
h1 : start < aig.decls.size
assign1 : Nat → Bool
h :
  (⟦{ aig := aig, ref := { gate := start, hgate := h1 } }, assign1⟧ &&
      (go aig start h1 (State.empty aig)).val.eval (cnfSatAssignment aig assign1)) =
    sat?
⊢ ⟦{ aig := aig, ref := { gate := start, hgate := h1 } }, assign1⟧ = sat?