add auto implementation of Pod::equals (#327)

src/backends/plonky2/emptypod.rs

@@ -1,5 +1,4 @@
 use std::{
-    any::Any,
     collections::HashMap,
     sync::{LazyLock, Mutex},
 };
@@ -193,17 +192,6 @@ impl Pod for EmptyPod {
         })
         .expect("serialization to json")
     }
-
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
-    fn equals(&self, other: &dyn Pod) -> bool {
-        if let Some(other) = other.as_any().downcast_ref::<EmptyPod>() {
-            self == other
-        } else {
-            false
-        }
-    }
 }
 
 impl RecursivePod for EmptyPod {

src/backends/plonky2/mainpod/mod.rs

@@ -676,17 +676,6 @@ impl Pod for MainPod {
         })
         .expect("serialization to json")
     }
-
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
-    fn equals(&self, other: &dyn Pod) -> bool {
-        if let Some(other) = other.as_any().downcast_ref::<MainPod>() {
-            self == other
-        } else {
-            false
-        }
-    }
 }
 
 impl RecursivePod for MainPod {

src/backends/plonky2/mock/emptypod.rs

@@ -1,5 +1,3 @@
-use std::any::Any;
-
 use itertools::Itertools;
 
 use crate::{
@@ -69,17 +67,6 @@ impl Pod for MockEmptyPod {
     fn serialize_data(&self) -> serde_json::Value {
         serde_json::Value::Null
     }
-
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
-    fn equals(&self, other: &dyn Pod) -> bool {
-        if let Some(other) = other.as_any().downcast_ref::<MockEmptyPod>() {
-            self == other
-        } else {
-            false
-        }
-    }
 }
 
 impl RecursivePod for MockEmptyPod {

src/backends/plonky2/mock/mainpod.rs

@@ -2,7 +2,7 @@
 // MainPod
 //
 
-use std::{any::Any, fmt, iter};
+use std::{fmt, iter};
 
 use itertools::Itertools;
 use serde::{Deserialize, Serialize};
@@ -367,17 +367,6 @@ impl Pod for MockMainPod {
         })
         .expect("serialization to json")
     }
-
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
-    fn equals(&self, other: &dyn Pod) -> bool {
-        if let Some(other) = other.as_any().downcast_ref::<MockMainPod>() {
-            self == other
-        } else {
-            false
-        }
-    }
 }
 
 impl RecursivePod for MockMainPod {

src/backends/plonky2/mock/signedpod.rs

@@ -1,4 +1,4 @@
-use std::{any::Any, collections::HashMap};
+use std::collections::HashMap;
 
 use itertools::Itertools;
 use serde::{Deserialize, Serialize};
@@ -166,17 +166,6 @@ impl Pod for MockSignedPod {
         })
         .expect("serialization to json")
     }
-
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
-    fn equals(&self, other: &dyn Pod) -> bool {
-        if let Some(other) = other.as_any().downcast_ref::<MockSignedPod>() {
-            self == other
-        } else {
-            false
-        }
-    }
 }
 
 #[cfg(test)]

src/backends/plonky2/signedpod.rs

@@ -1,4 +1,4 @@
-use std::{any::Any, collections::HashMap, sync::LazyLock};
+use std::{collections::HashMap, sync::LazyLock};
 
 use itertools::Itertools;
 use num_bigint::{BigUint, RandBigInt};
@@ -203,17 +203,6 @@ impl Pod for SignedPod {
         })
         .expect("serialization to json")
     }
-
-    fn as_any(&self) -> &dyn Any {
-        self
-    }
-    fn equals(&self, other: &dyn Pod) -> bool {
-        if let Some(other) = other.as_any().downcast_ref::<SignedPod>() {
-            self == other
-        } else {
-            false
-        }
-    }
 }
 
 #[cfg(test)]