Use group crate for curve traits

benches/bls12_381/ec.rs

@@ -1,8 +1,8 @@
 mod g1 {
     use rand::{Rand, SeedableRng, XorShiftRng};
 
+    use group::CurveProjective;
     use pairing::bls12_381::*;
-    use pairing::CurveProjective;
 
     #[bench]
     fn bench_g1_mul_assign(b: &mut ::test::Bencher) {
@@ -65,8 +65,8 @@ mod g1 {
 mod g2 {
     use rand::{Rand, SeedableRng, XorShiftRng};
 
+    use group::CurveProjective;
     use pairing::bls12_381::*;
-    use pairing::CurveProjective;
 
     #[bench]
     fn bench_g2_mul_assign(b: &mut ::test::Bencher) {

benches/bls12_381/mod.rs

@@ -7,7 +7,7 @@ mod fr;
 use rand::{Rand, SeedableRng, XorShiftRng};
 
 use pairing::bls12_381::*;
-use pairing::{CurveAffine, Engine};
+use pairing::{Engine, PairingCurveAffine};
 
 #[bench]
 fn bench_pairing_g1_preparation(b: &mut ::test::Bencher) {

benches/pairing_benches.rs

@@ -1,6 +1,7 @@
 #![feature(test)]
 
 extern crate ff;
+extern crate group;
 extern crate pairing;
 extern crate rand;
 extern crate test;