message: derive eq as well
diff: @@ -13,7 +13,7 @@ use o1_utils::foreign_field::{ForeignElement, HI, LO, MI, TWO_TO_LIMB};
  use std::array;
  /// All foreign field operations allowed
  -#[derive(PartialEq, Debug, Copy, Clone)]
  +#[derive(PartialEq, Eq, Debug, Copy, Clone)]
  pub enum FFOps {
  /// Addition
  Add,
  