diff --git a/halo2_proofs/src/plonk.rs b/halo2_proofs/src/plonk.rs
index ad0e80362..72305731e 100644
--- a/halo2_proofs/src/plonk.rs
+++ b/halo2_proofs/src/plonk.rs
@@ -228,7 +228,8 @@ impl<C: CurveAffine> VerifyingKey<C> {
             + self.permutation.bytes_length(format)
             + self.selectors.len()
                 * (self
-                    .selectors.first()
+                    .selectors
+                    .first()
                     .map(|selector| (selector.len() + 7) / 8)
                     .unwrap_or(0))
     }
diff --git a/halo2_proofs/src/plonk/mv_lookup.rs b/halo2_proofs/src/plonk/mv_lookup.rs
index d66983c4b..c8a947f88 100644
--- a/halo2_proofs/src/plonk/mv_lookup.rs
+++ b/halo2_proofs/src/plonk/mv_lookup.rs
@@ -55,11 +55,8 @@ impl<F: Field> Argument<F> {
             input_degree
         };
 
-        let inputs_expressions_degree: usize = self
-            .inputs_expressions
-            .iter()
-            .map(expr_degree)
-            .sum();
+        let inputs_expressions_degree: usize =
+            self.inputs_expressions.iter().map(expr_degree).sum();
 
         let mut table_degree = 0;
         for expr in self.table_expressions.iter() {
diff --git a/halo2_proofs/src/plonk/mv_lookup/prover.rs b/halo2_proofs/src/plonk/mv_lookup/prover.rs
index 74e8d0070..abf3a6327 100644
--- a/halo2_proofs/src/plonk/mv_lookup/prover.rs
+++ b/halo2_proofs/src/plonk/mv_lookup/prover.rs
@@ -20,7 +20,6 @@ use group::{
 };
 use rustc_hash::FxHashMap as HashMap;
 
-
 use std::{
     iter,
     ops::{Mul, MulAssign},