fix: minor code quality fixes

halo2-base/src/gates/flex_gate.rs

@@ -74,7 +74,7 @@ impl<F: ScalarField> BasicGateConfig<F> {
     /// Wrapper for [ConstraintSystem].create_gate(name, meta) creates a gate form [q * (a + b * c - out)].
     /// * `meta`: [ConstraintSystem] used for the gate
     fn create_gate(&self, meta: &mut ConstraintSystem<F>) {
-        meta.create_gate("1 column a * b + c = out", |meta| {
+        meta.create_gate("1 column a + b * c = out", |meta| {
             let q = meta.query_selector(self.q_enable);
 
             let a = meta.query_advice(self.value, Rotation::cur());

halo2-ecc/src/fields/fp.rs

@@ -69,6 +69,9 @@ pub struct FpChip<'range, F: PrimeField, Fp: PrimeField> {
 
 impl<'range, F: PrimeField, Fp: PrimeField> FpChip<'range, F, Fp> {
     pub fn new(range: &'range RangeChip<F>, limb_bits: usize, num_limbs: usize) -> Self {
+        assert!(limb_bits > 0);
+        assert!(num_limbs > 0);
+        assert!(limb_bits <= F::CAPACITY as usize);
         let limb_mask = (BigUint::from(1u64) << limb_bits) - 1usize;
         let p = modulus::<Fp>();
         let p_limbs = decompose_biguint(&p, num_limbs, limb_bits);

hashes/zkevm-keccak/src/keccak_packed_multi.rs

@@ -337,7 +337,7 @@ impl<F: FieldExt> CellManager<F> {
         // Make sure all rows start at the same column
         let width = self.get_width();
         #[cfg(debug_assertions)]
-        for row in self.rows.iter_mut() {
+        for row in self.rows.iter() {
             self.num_unused_cells += width - *row;
         }
         self.rows = vec![width; self.height];
@@ -1135,7 +1135,7 @@ impl<F: Field> KeccakCircuitConfig<F> {
             for i in 0..5 {
                 let input = scatter::expr(3, part_size_base) - 2.expr() * input[i].clone()
                     + input[(i + 1) % 5].clone()
-                    - input[(i + 2) % 5].clone().clone();
+                    - input[(i + 2) % 5].clone();
                 let output = output[i].clone();
                 meta.lookup("chi base", |_| {
                     vec![(input.clone(), chi_base_table[0]), (output.clone(), chi_base_table[1])]