∀ (α : Lean.Expr) (u : Lean.Level) (e h : Lean.Expr) (varDeps : Array (Array ℕ)) (fType : Lean.Expr),
  sizeOf { α := α, u := u, e := e, h := h, varDeps := varDeps, fType := fType } =
    1 + sizeOf α + sizeOf u + sizeOf e + sizeOf h + sizeOf varDeps + sizeOf fType