diff --git a/src/circuit_data.rs b/src/circuit_data.rs
index 8f422b93..e389ed27 100644
--- a/src/circuit_data.rs
+++ b/src/circuit_data.rs
@@ -11,7 +11,6 @@ use crate::generator::WitnessGenerator;
 use crate::polynomial::commitment::ListPolynomialCommitment;
 use crate::proof::{Hash, HashTarget, Proof};
 use crate::prover::prove;
-use crate::target::Target;
 use crate::util::marking::MarkedTargets;
 use crate::verifier::verify;
 use crate::witness::PartialWitness;
diff --git a/src/fri/recursive_verifier.rs b/src/fri/recursive_verifier.rs
index 99e21622..5bbd5e80 100644
--- a/src/fri/recursive_verifier.rs
+++ b/src/fri/recursive_verifier.rs
@@ -1,6 +1,3 @@
-use env_logger::builder;
-use itertools::izip;
-
 use crate::circuit_builder::CircuitBuilder;
 use crate::circuit_data::CommonCircuitData;
 use crate::field::extension_field::target::{flatten_target, ExtensionTarget};
@@ -120,7 +117,7 @@ impl<F: Extendable<D>, const D: usize> CircuitBuilder<F, D> {
                 zeta,
                 alpha,
                 initial_merkle_roots,
-                &proof,
+                proof,
                 challenger,
                 n,
                 &betas,
@@ -205,7 +202,7 @@ impl<F: Extendable<D>, const D: usize> CircuitBuilder<F, D> {
             .take(common_data.zs_range().end)
             .map(|&e| self.convert_to_ext(e))
             .collect::<Vec<_>>();
-        let mut zs_composition_eval = alpha.clone().reduce(&zs_evals, self);
+        let zs_composition_eval = alpha.clone().reduce(&zs_evals, self);
 
         let g = self.constant_extension(F::Extension::primitive_root_of_unity(degree_log));
         let zeta_right = self.mul_extension(g, zeta);
@@ -229,7 +226,7 @@ impl<F: Extendable<D>, const D: usize> CircuitBuilder<F, D> {
             .iter()
             .map(|&e| self.convert_to_ext(e))
             .collect::<Vec<_>>();
-        let mut wire_composition_eval = alpha.clone().reduce(&wire_evals, self);
+        let wire_composition_eval = alpha.clone().reduce(&wire_evals, self);
         let mut alpha_frob = alpha.repeated_frobenius(D - 1, self);
         let wire_eval = alpha.reduce(&os.wires, self);
         let wire_eval_frob = alpha_frob.reduce(&os.wires, self);
diff --git a/src/gadgets/arithmetic_extension.rs b/src/gadgets/arithmetic_extension.rs
index 57968a23..f308d1fc 100644
--- a/src/gadgets/arithmetic_extension.rs
+++ b/src/gadgets/arithmetic_extension.rs
@@ -447,7 +447,6 @@ mod tests {
     use crate::field::crandall_field::CrandallField;
     use crate::field::extension_field::quartic::QuarticCrandallField;
     use crate::field::field::Field;
-    use crate::fri::FriConfig;
     use crate::verifier::verify;
     use crate::witness::PartialWitness;
 
diff --git a/src/gadgets/interpolation.rs b/src/gadgets/interpolation.rs
index 8ece6063..a531515c 100644
--- a/src/gadgets/interpolation.rs
+++ b/src/gadgets/interpolation.rs
@@ -65,7 +65,7 @@ mod tests {
     use crate::field::extension_field::quartic::QuarticCrandallField;
     use crate::field::extension_field::FieldExtension;
     use crate::field::field::Field;
-    use crate::field::interpolation::{interpolant, interpolate};
+    use crate::field::interpolation::interpolant;
     use crate::verifier::verify;
     use crate::witness::PartialWitness;
 
diff --git a/src/gates/base_sum.rs b/src/gates/base_sum.rs
index e34aa6c1..8f453d8e 100644
--- a/src/gates/base_sum.rs
+++ b/src/gates/base_sum.rs
@@ -170,7 +170,6 @@ impl<F: Field, const B: usize> SimpleGenerator<F> for BaseSplitGenerator<B> {
 
 #[cfg(test)]
 mod tests {
-    use crate::circuit_data::CircuitConfig;
     use crate::field::crandall_field::CrandallField;
     use crate::gates::base_sum::BaseSumGate;
     use crate::gates::gate_testing::test_low_degree;
diff --git a/src/gates/gmimc.rs b/src/gates/gmimc.rs
index 4f23a46e..e12668a3 100644
--- a/src/gates/gmimc.rs
+++ b/src/gates/gmimc.rs
@@ -325,8 +325,6 @@ mod tests {
     use crate::gates::gmimc::{GMiMCGate, W};
     use crate::generator::generate_partial_witness;
     use crate::gmimc::gmimc_permute_naive;
-    use crate::permutation_argument::TargetPartition;
-    use crate::target::Target;
     use crate::vars::{EvaluationTargets, EvaluationVars};
     use crate::verifier::verify;
     use crate::wire::Wire;
diff --git a/src/merkle_proofs.rs b/src/merkle_proofs.rs
index 74bdf67d..a9aeeb27 100644
--- a/src/merkle_proofs.rs
+++ b/src/merkle_proofs.rs
@@ -157,7 +157,6 @@ mod tests {
     use crate::circuit_data::CircuitConfig;
     use crate::field::crandall_field::CrandallField;
     use crate::field::extension_field::quartic::QuarticCrandallField;
-    use crate::merkle_proofs::verify_merkle_proof;
     use crate::merkle_tree::MerkleTree;
     use crate::verifier::verify;
     use crate::witness::PartialWitness;
@@ -169,7 +168,6 @@ mod tests {
     #[test]
     fn test_recursive_merkle_proof() -> Result<()> {
         type F = CrandallField;
-        type FF = QuarticCrandallField;
         let config = CircuitConfig::large_config();
         let mut builder = CircuitBuilder::<F, 4>::new(config);
         let mut pw = PartialWitness::new();
@@ -177,7 +175,7 @@ mod tests {
         let log_n = 8;
         let n = 1 << log_n;
         let leaves = random_data::<F>(n, 7);
-        let tree = MerkleTree::new(leaves.clone(), false);
+        let tree = MerkleTree::new(leaves, false);
         let i: usize = thread_rng().gen_range(0, n);
         let proof = tree.prove(i);
 
diff --git a/src/merkle_tree.rs b/src/merkle_tree.rs
index ed092cff..d6fa8694 100644
--- a/src/merkle_tree.rs
+++ b/src/merkle_tree.rs
@@ -114,7 +114,7 @@ mod tests {
         let leaves = random_data::<F>(n, 7);
 
         verify_all_leaves(leaves.clone(), n, false)?;
-        verify_all_leaves(leaves.clone(), n, true)?;
+        verify_all_leaves(leaves, n, true)?;
 
         Ok(())
     }
diff --git a/src/permutation_argument.rs b/src/permutation_argument.rs
index c3169285..ca5a228f 100644
--- a/src/permutation_argument.rs
+++ b/src/permutation_argument.rs
@@ -145,10 +145,10 @@ impl WirePartitions {
         debug_assert_eq!(self.indices.len() % degree, 0);
         let num_routed_wires = self.indices.len() / degree;
 
-        /// Find a wire's "neighbor" in the context of Plonk's "extended copy constraints" check. In
-        /// other words, find the next wire in the given wire's partition. If the given wire is last in
-        /// its partition, this will loop around. If the given wire has a partition all to itself, it
-        /// is considered its own neighbor.
+        // Find a wire's "neighbor" in the context of Plonk's "extended copy constraints" check. In
+        // other words, find the next wire in the given wire's partition. If the given wire is last in
+        // its partition, this will loop around. If the given wire has a partition all to itself, it
+        // is considered its own neighbor.
         let mut neighbors = HashMap::new();
         for subset in &self.partition {
             for n in 0..subset.len() {
diff --git a/src/plonk_challenger.rs b/src/plonk_challenger.rs
index da7253f0..f48cbbf1 100644
--- a/src/plonk_challenger.rs
+++ b/src/plonk_challenger.rs
@@ -346,7 +346,6 @@ mod tests {
     use crate::field::crandall_field::CrandallField;
     use crate::field::field::Field;
     use crate::generator::generate_partial_witness;
-    use crate::permutation_argument::TargetPartition;
     use crate::plonk_challenger::{Challenger, RecursiveChallenger};
     use crate::target::Target;
     use crate::witness::PartialWitness;
diff --git a/src/plonk_common.rs b/src/plonk_common.rs
index 2c3a0817..6fd0c393 100644
--- a/src/plonk_common.rs
+++ b/src/plonk_common.rs
@@ -1,16 +1,12 @@
 use std::borrow::Borrow;
 
 use crate::circuit_builder::CircuitBuilder;
-use crate::circuit_data::CommonCircuitData;
 use crate::field::extension_field::target::ExtensionTarget;
 use crate::field::extension_field::Extendable;
 use crate::field::field::Field;
-use crate::gates::gate::{GateRef, PrefixedGate};
 use crate::polynomial::commitment::SALT_SIZE;
 use crate::polynomial::polynomial::PolynomialCoeffs;
 use crate::target::Target;
-use crate::util::partial_products::check_partial_products;
-use crate::vars::{EvaluationTargets, EvaluationVars, EvaluationVarsBase};
 
 /// Holds the Merkle tree index and blinding flag of a set of polynomials used in FRI.
 #[derive(Debug, Copy, Clone)]
diff --git a/src/prover.rs b/src/prover.rs
index 25243c0a..cefe165f 100644
--- a/src/prover.rs
+++ b/src/prover.rs
@@ -14,10 +14,8 @@ use crate::proof::Proof;
 use crate::timed;
 use crate::util::partial_products::partial_products;
 use crate::util::{log2_ceil, transpose};
-use crate::vanishing_poly::{
-    eval_vanishing_poly_base, evaluate_gate_constraints, evaluate_gate_constraints_base, yoba,
-};
-use crate::vars::{EvaluationVars, EvaluationVarsBase};
+use crate::vanishing_poly::eval_vanishing_poly_base;
+use crate::vars::EvaluationVarsBase;
 use crate::witness::{PartialWitness, Witness};
 
 pub(crate) fn prove<F: Extendable<D>, const D: usize>(
diff --git a/src/recursive_verifier.rs b/src/recursive_verifier.rs
index 940c0142..1bd58c2a 100644
--- a/src/recursive_verifier.rs
+++ b/src/recursive_verifier.rs
@@ -1,8 +1,6 @@
 use crate::circuit_builder::CircuitBuilder;
 use crate::circuit_data::{CircuitConfig, CommonCircuitData, VerifierCircuitTarget};
 use crate::field::extension_field::Extendable;
-use crate::field::field::Field;
-use crate::gates::gate::{GateRef, PrefixedGate};
 use crate::plonk_challenger::RecursiveChallenger;
 use crate::proof::{HashTarget, ProofTarget};
 use crate::util::scaling::ReducingFactorTarget;
@@ -114,17 +112,14 @@ impl<F: Extendable<D>, const D: usize> CircuitBuilder<F, D> {
 mod tests {
     use super::*;
     use crate::field::crandall_field::CrandallField;
-    use crate::field::extension_field::quartic::QuarticCrandallField;
-    use crate::field::extension_field::target::ExtensionTarget;
     use crate::fri::FriConfig;
     use crate::gadgets::polynomial::PolynomialCoeffsExtTarget;
     use crate::merkle_proofs::MerkleProofTarget;
     use crate::polynomial::commitment::OpeningProofTarget;
     use crate::proof::{
         FriInitialTreeProofTarget, FriProofTarget, FriQueryRoundTarget, FriQueryStepTarget,
-        HashTarget, OpeningSetTarget, Proof,
+        OpeningSetTarget, Proof,
     };
-    use crate::target::Target;
     use crate::verifier::verify;
     use crate::witness::PartialWitness;
 
@@ -319,7 +314,6 @@ mod tests {
     fn test_recursive_verifier() {
         env_logger::init();
         type F = CrandallField;
-        type FF = QuarticCrandallField;
         const D: usize = 4;
         let config = CircuitConfig {
             num_wires: 134,
@@ -336,10 +330,10 @@ mod tests {
         };
         let (proof, vd, cd) = {
             let mut builder = CircuitBuilder::<F, D>::new(config.clone());
-            let two = builder.two();
-            let two = builder.hash_n_to_hash(vec![two], true).elements[0];
-            for i in 0..1000 {
-                let two = builder.mul(two, two);
+            let _two = builder.two();
+            let _two = builder.hash_n_to_hash(vec![_two], true).elements[0];
+            for _ in 0..1000 {
+                let _two = builder.mul(_two, _two);
             }
             let data = builder.build();
             (
diff --git a/src/util/marking.rs b/src/util/marking.rs
index 228c46b1..758d583e 100644
--- a/src/util/marking.rs
+++ b/src/util/marking.rs
@@ -1,11 +1,8 @@
-use std::convert::TryInto;
-
 use crate::field::extension_field::target::ExtensionTarget;
 use crate::field::extension_field::Extendable;
-use crate::field::field::Field;
 use crate::proof::HashTarget;
 use crate::target::Target;
-use crate::witness::{PartialWitness, Witness};
+use crate::witness::PartialWitness;
 
 /// Enum representing all types of targets, so that they can be marked.
 #[derive(Clone)]
diff --git a/src/util/scaling.rs b/src/util/scaling.rs
index 6effc5db..e2cedfb8 100644
--- a/src/util/scaling.rs
+++ b/src/util/scaling.rs
@@ -187,10 +187,7 @@ mod tests {
         let mut builder = CircuitBuilder::<F, D>::new(config);
 
         let alpha = FF::rand();
-        let alpha = FF::ONE;
-        let vs = (0..n)
-            .map(|i| FF::from_canonical_usize(i))
-            .collect::<Vec<_>>();
+        let vs = (0..n).map(FF::from_canonical_usize).collect::<Vec<_>>();
 
         let manual_reduce = ReducingFactor::new(alpha).reduce(vs.iter());
         let manual_reduce = builder.constant_extension(manual_reduce);
diff --git a/src/vanishing_poly.rs b/src/vanishing_poly.rs
index 70d19230..d176e57b 100644
--- a/src/vanishing_poly.rs
+++ b/src/vanishing_poly.rs
@@ -3,11 +3,10 @@ use crate::circuit_data::CommonCircuitData;
 use crate::field::extension_field::target::ExtensionTarget;
 use crate::field::extension_field::Extendable;
 use crate::field::field::Field;
-use crate::gates::gate::{Gate, GateRef, PrefixedGate};
+use crate::gates::gate::PrefixedGate;
 use crate::plonk_common;
-use crate::plonk_common::{eval_l_1, eval_l_1_recursively, ZeroPolyOnCoset};
+use crate::plonk_common::{eval_l_1_recursively, ZeroPolyOnCoset};
 use crate::target::Target;
-use crate::util::marking::MarkedTargets;
 use crate::util::partial_products::{check_partial_products, check_partial_products_recursively};
 use crate::util::scaling::ReducingFactorTarget;
 use crate::vars::{EvaluationTargets, EvaluationVars, EvaluationVarsBase};
@@ -185,108 +184,6 @@ pub(crate) fn eval_vanishing_poly_base<F: Extendable<D>, const D: usize>(
     plonk_common::reduce_with_powers_multi(&vanishing_terms, alphas)
 }
 
-pub(crate) fn yoba<F: Extendable<D>, const D: usize>(
-    common_data: &CommonCircuitData<F, D>,
-    index: usize,
-    x: F,
-    vars: EvaluationVarsBase<F>,
-    local_zs: &[F],
-    next_zs: &[F],
-    partial_products: &[F],
-    s_sigmas: &[F],
-    betas: &[F],
-    gammas: &[F],
-    alphas: &[F],
-) -> Vec<F> {
-    let max_degree = common_data.quotient_degree_factor;
-    let (num_prods, final_num_prod) = common_data.num_partial_products;
-
-    let constraint_terms =
-        evaluate_gate_constraints_base(&common_data.gates, common_data.num_gate_constraints, vars);
-
-    // The L_1(x) (Z(x) - 1) vanishing terms.
-    let mut vanishing_z_1_terms = Vec::new();
-    // The terms checking the partial products.
-    let mut vanishing_partial_products_terms = Vec::new();
-    // The Z(x) f'(x) - g'(x) Z(g x) terms.
-    let mut vanishing_v_shift_terms = Vec::new();
-
-    for i in 0..common_data.config.num_challenges {
-        let z_x = local_zs[i];
-        let z_gz = next_zs[i];
-        vanishing_z_1_terms.push(eval_l_1(common_data.degree(), x) * (z_x - F::ONE));
-
-        let numerator_values = (0..common_data.config.num_routed_wires)
-            .map(|j| {
-                let wire_value = vars.local_wires[j];
-                let k_i = common_data.k_is[j];
-                let s_id = k_i * x;
-                wire_value + betas[i] * s_id + gammas[i]
-            })
-            .collect::<Vec<_>>();
-        let denominator_values = (0..common_data.config.num_routed_wires)
-            .map(|j| {
-                let wire_value = vars.local_wires[j];
-                let s_sigma = s_sigmas[j];
-                wire_value + betas[i] * s_sigma + gammas[i]
-            })
-            .collect::<Vec<_>>();
-        let quotient_values = (0..common_data.config.num_routed_wires)
-            .map(|j| numerator_values[j] / denominator_values[j])
-            .collect::<Vec<_>>();
-
-        // The partial products considered for this iteration of `i`.
-        let current_partial_products = &partial_products[i * num_prods..(i + 1) * num_prods];
-        // Check the numerator partial products.
-        let mut partial_product_check =
-            check_partial_products(&quotient_values, current_partial_products, max_degree);
-        // The first checks are of the form `q - n/d` which is a rational function not a polynomial.
-        // We multiply them by `d` to get checks of the form `q*d - n` which low-degree polynomials.
-        denominator_values
-            .chunks(max_degree)
-            .zip(partial_product_check.iter_mut())
-            .for_each(|(d, q)| {
-                *q *= d.iter().copied().product();
-            });
-        vanishing_partial_products_terms.extend(partial_product_check);
-
-        // The quotient final product is the product of the last `final_num_prod` elements.
-        let quotient: F = current_partial_products[num_prods - final_num_prod..]
-            .iter()
-            .copied()
-            .product();
-        assert_eq!(
-            quotient,
-            numerator_values.iter().copied().product::<F>()
-                / denominator_values.iter().copied().product::<F>()
-        );
-        vanishing_v_shift_terms.push(quotient * z_x - z_gz);
-    }
-
-    if vanishing_z_1_terms.iter().any(|x| !x.is_zero()) {
-        dbg!(&vanishing_z_1_terms);
-    }
-    if vanishing_partial_products_terms
-        .iter()
-        .any(|x| !x.is_zero())
-    {
-        dbg!(&vanishing_partial_products_terms);
-    }
-    if vanishing_v_shift_terms.iter().any(|x| !x.is_zero()) {
-        dbg!(&vanishing_v_shift_terms);
-    }
-    if constraint_terms.iter().any(|x| !x.is_zero()) {
-        dbg!(&constraint_terms);
-    }
-    [
-        vanishing_z_1_terms,
-        vanishing_partial_products_terms,
-        vanishing_v_shift_terms,
-        constraint_terms,
-    ]
-    .concat()
-}
-
 /// Evaluates all gate constraints.
 ///
 /// `num_gate_constraints` is the largest number of constraints imposed by any gate. It is not
diff --git a/src/verifier.rs b/src/verifier.rs
index 864a2c15..ce438449 100644
--- a/src/verifier.rs
+++ b/src/verifier.rs
@@ -4,7 +4,7 @@ use crate::circuit_data::{CommonCircuitData, VerifierOnlyCircuitData};
 use crate::field::extension_field::Extendable;
 use crate::field::field::Field;
 use crate::plonk_challenger::Challenger;
-use crate::plonk_common::{eval_zero_poly, reduce_with_powers};
+use crate::plonk_common::reduce_with_powers;
 use crate::proof::Proof;
 use crate::vanishing_poly::eval_vanishing_poly;
 use crate::vars::EvaluationVars;
diff --git a/src/witness.rs b/src/witness.rs
index ac555f82..25885ba3 100644
--- a/src/witness.rs
+++ b/src/witness.rs
@@ -117,7 +117,7 @@ impl<F: Field> PartialWitness<F> {
 
     pub fn set_hash_target(&mut self, ht: HashTarget, value: Hash<F>) {
         ht.elements
-            .into_iter()
+            .iter()
             .zip(value.elements)
             .for_each(|(&t, x)| self.set_target(t, x));
     }