fix RngCore Sized

Cargo.toml

@@ -18,7 +18,7 @@ edition ="2018"
 
 [dependencies]
 byteorder = "1"
-ff = { version = "0.5.0", path = "../ff", features = ["derive"] }
+ff = { version = "0.6.0", path = "../ff", features = ["derive"] }
 group = { version = "0.2.0", path = "../group" }
 rand_core = "0.5"
 

src/bls12_381/ec.rs

@@ -200,7 +200,7 @@ macro_rules! curve_impl {
             type Base = $basefield;
             type Affine = $affine;
 
-            fn random<R: RngCore>(rng: &mut R) -> Self {
+            fn random<R: RngCore + ?std::marker::Sized>(rng: &mut R) -> Self {
                 loop {
                     let x = $basefield::random(rng);
                     let greatest = rng.next_u32() % 2 != 0;

src/bls12_381/fq12.rs

@@ -40,7 +40,7 @@ impl Fq12 {
 }
 
 impl Field for Fq12 {
-    fn random<R: RngCore>(rng: &mut R) -> Self {
+    fn random<R: RngCore + ?std::marker::Sized>(rng: &mut R) -> Self {
         Fq12 {
             c0: Fq6::random(rng),
             c1: Fq6::random(rng),

src/bls12_381/fq2.rs

@@ -57,7 +57,7 @@ impl Fq2 {
 }
 
 impl Field for Fq2 {
-    fn random<R: RngCore>(rng: &mut R) -> Self {
+    fn random<R: RngCore + ?std::marker::Sized>(rng: &mut R) -> Self {
         Fq2 {
             c0: Fq::random(rng),
             c1: Fq::random(rng),

src/bls12_381/fq6.rs

@@ -100,7 +100,7 @@ impl Fq6 {
 }
 
 impl Field for Fq6 {
-    fn random<R: RngCore>(rng: &mut R) -> Self {
+    fn random<R: RngCore + ?std::marker::Sized>(rng: &mut R) -> Self {
         Fq6 {
             c0: Fq2::random(rng),
             c1: Fq2::random(rng),