Use operator syntax

eliminate a few redundant references

crypto-primitives/src/crh/bowe_hopwood/mod.rs

@@ -134,10 +134,10 @@ impl FixedLengthCRH for BoweHopwoodPedersenCRH
                     .map(|(chunk_bits, generator)| {
                         let mut encoded = generator.clone();
                         if chunk_bits[0] {
-                            encoded = encoded + &generator;
+                            encoded = encoded + generator;
                         }
                         if chunk_bits[1] {
-                            encoded = encoded + &generator.double();
+                            encoded += &generator.double();
                         }
                         if chunk_bits[2] {
                             encoded = encoded.neg();

crypto-primitives/src/crh/pedersen/mod.rs

@@ -106,7 +106,7 @@ impl FixedLengthCRH for PedersenCRH {
                 let mut encoded = G::zero();
                 for (bit, base) in bits.iter().zip(generator_powers.iter()) {
                     if *bit {
-                        encoded = encoded + base;
+                        encoded += base;
                     }
                 }
                 encoded

r1cs-std/src/bits/uint32.rs

@@ -205,7 +205,7 @@ impl UInt32 {
                         all_constants = false;
 
                         // Add coeff * bit_gadget
-                        lc = lc + (coeff, bit.get_variable());
+                        lc += (coeff, bit.get_variable());
                     },
                     Boolean::Not(ref bit) => {
                         all_constants = false;
@@ -215,7 +215,7 @@ impl UInt32 {
                     },
                     Boolean::Constant(bit) => {
                         if bit {
-                            lc = lc + (coeff, CS::one());
+                            lc += (coeff, CS::one());
                         }
                     },
                 }

r1cs-std/src/fields/fp.rs

@@ -364,7 +364,7 @@ impl ToBitsGadget for FpGadget {
         let mut coeff = F::one();
 
         for bit in bits.iter().rev() {
-            lc = lc + (coeff, bit.get_variable());
+            lc += (coeff, bit.get_variable());
 
             coeff.double_in_place();
         }
@@ -412,7 +412,7 @@ impl ToBytesGadget for FpGadget {
         {
             match bit {
                 Boolean::Is(bit) => {
-                    lc = lc + (coeff, bit.get_variable());
+                    lc += (coeff, bit.get_variable());
                     coeff.double_in_place();
                 },
                 Boolean::Constant(_) | Boolean::Not(_) => unreachable!(),

r1cs-std/src/groups/curves/twisted_edwards/mod.rs

@@ -994,7 +994,7 @@ mod projective_impl {
                     let mut coords = vec![];
                     for _ in 0..4 {
                         coords.push(acc_power);
-                        acc_power = acc_power + base_power;
+                        acc_power += base_power;
                     }
 
                     let bits = bits.borrow().to_bits(