halo2_proofs: Fix clippy lints

halo2_proofs/examples/cost-model.rs

@@ -102,7 +102,7 @@ impl FromStr for Poly {
 
 #[derive(Debug)]
 struct Lookup {
-    columns: usize,
+    _columns: usize,
     input_deg: usize,
     table_deg: usize,
 }
@@ -112,11 +112,11 @@ impl FromStr for Lookup {
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
         let mut parts = s.split(',');
-        let columns = parts.next().unwrap().parse()?;
+        let _columns = parts.next().unwrap().parse()?;
         let input_deg = parts.next().unwrap().parse()?;
         let table_deg = parts.next().unwrap().parse()?;
         Ok(Lookup {
-            columns,
+            _columns,
             input_deg,
             table_deg,
         })

halo2_proofs/src/poly.rs

@@ -195,7 +195,7 @@ impl<'a, F: Field, B: Basis> Add<&'a Polynomial<F, B>> for Polynomial<F, B> {
     }
 }
 
-impl<'a, F: Field> Polynomial<F, LagrangeCoeff> {
+impl<F: Field> Polynomial<F, LagrangeCoeff> {
     /// Rotates the values in a Lagrange basis polynomial by `Rotation`
     pub fn rotate(&self, rotation: Rotation) -> Polynomial<F, LagrangeCoeff> {
         let mut values = self.values.clone();
@@ -211,7 +211,7 @@ impl<'a, F: Field> Polynomial<F, LagrangeCoeff> {
     }
 }
 
-impl<'a, F: Field, B: Basis> Mul<F> for Polynomial<F, B> {
+impl<F: Field, B: Basis> Mul<F> for Polynomial<F, B> {
     type Output = Polynomial<F, B>;
 
     fn mul(mut self, rhs: F) -> Polynomial<F, B> {

halo2_proofs/src/poly/domain.rs

@@ -390,7 +390,7 @@ impl<G: Group> EvaluationDomain<G> {
         } else {
             point *= &self
                 .get_omega_inv()
-                .pow_vartime(&[(rotation.0 as i64).abs() as u64]);
+                .pow_vartime(&[(rotation.0 as i64).unsigned_abs()]);
         }
         point
     }