add set_bit for fr

src/fields/fp.rs

@@ -98,6 +98,10 @@ macro_rules! field_impl {
             pub fn raw(&self) -> &U256 {
                 &self.0
             }
+
+            pub fn set_bit(&mut self, bit: usize, to: bool) {
+                self.0.set_bit(bit, to);
+            }
         }
 
         impl FieldElement for $name {

src/lib.rs

@@ -65,6 +65,9 @@ impl Fr {
     pub fn into_u256(self) -> arith::U256 {
         (self.0).into()
     }
+    pub fn set_bit(&mut self, bit: usize, to: bool) {
+        self.0.set_bit(bit, to);
+    }
 }
 
 impl Add<Fr> for Fr {