tmp fix to make it work at the current arkworks version with the cherry-picks

src/fields/fp/mod.rs

@@ -129,13 +129,14 @@ impl<F: PrimeField> AllocatedFp<F> {
     ///
     /// This does not create any constraints and only creates one linear
     /// combination.
-    pub fn addmany<'a, I: Iterator<Item = &'a Self>>(iter: I) -> Self {
+    pub fn addmany<B: Borrow<Self>, I: Iterator<Item = B>>(iter: I) -> Self {
         let mut cs = ConstraintSystemRef::None;
         let mut has_value = true;
         let mut value = F::zero();
         let mut new_lc = lc!();
 
         for variable in iter {
+            let variable = variable.borrow();
             if !variable.cs.is_none() {
                 cs = cs.or(variable.cs.clone());
             }
@@ -1063,6 +1064,22 @@ impl<'a, F: PrimeField> Sum<&'a FpVar<F>> for FpVar<F> {
     }
 }
 
+impl<'a, F: PrimeField> Sum<FpVar<F>> for FpVar<F> {
+    fn sum<I: Iterator<Item = FpVar<F>>>(iter: I) -> FpVar<F> {
+        let mut sum_constants = F::zero();
+        let sum_variables = FpVar::Var(AllocatedFp::<F>::addmany(iter.filter_map(|x| match x {
+            FpVar::Constant(c) => {
+                sum_constants += c;
+                None
+            },
+            FpVar::Var(v) => Some(v),
+        })));
+
+        let sum = sum_variables + sum_constants;
+        sum
+    }
+}
+
 #[cfg(test)]
 mod test {
     use crate::{

src/groups/curves/short_weierstrass/mod.rs

@@ -851,7 +851,7 @@ where
                 let (mut ge, iter) = if cofactor_weight < modulus_minus_1_weight {
                     let ge = Self::new_variable_omit_prime_order_check(
                         ark_relations::ns!(cs, "Witness without subgroup check with cofactor mul"),
-                        || f().map(|g| g.borrow().into_affine().mul_by_cofactor_inv().into()),
+                        || f().map(|g| g.into_affine().mul_by_cofactor_inv().into()),
                         mode,
                     )?;
                     (

src/groups/curves/twisted_edwards/mod.rs

@@ -337,7 +337,7 @@ where
                 .iter()
                 .zip(segment_powers.borrow())
             {
-                let base_power = base_power.borrow();
+                let base_power = base_power;
                 let mut acc_power = *base_power;
                 let mut coords = vec![];
                 for _ in 0..4 {
@@ -609,7 +609,7 @@ where
                 let (mut ge, iter) = if cofactor_weight < modulus_minus_1_weight {
                     let ge = Self::new_variable_omit_prime_order_check(
                         ark_relations::ns!(cs, "Witness without subgroup check with cofactor mul"),
-                        || f().map(|g| g.borrow().into_affine().mul_by_cofactor_inv().into()),
+                        || f().map(|g| g.into_affine().mul_by_cofactor_inv().into()),
                         mode,
                     )?;
                     (

src/poly/evaluations/univariate/mod.rs

@@ -166,7 +166,7 @@ impl<F: PrimeField> EvaluationsVar<F> {
             .map(|(coeff, eval)| coeff * eval)
             .sum::<FpVar<F>>();
 
-        Ok(interpolation)
+        Ok(interpolation.clone())
     }
 
     /// Generate interpolation constraints. We assume at compile time we know