cargo fix --edition-idioms for bellman

bellman/src/groth16/tests/dummy_engine.rs

@@ -16,7 +16,7 @@ const MODULUS_R: Wrapping<u32> = Wrapping(64513);
 pub struct Fr(Wrapping<u32>);
 
 impl fmt::Display for Fr {
-    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
         write!(f, "{}", (self.0).0)
     }
 }
@@ -149,7 +149,7 @@ impl PartialOrd for FrRepr {
 }
 
 impl fmt::Display for FrRepr {
-    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
         write!(f, "{}", (self.0)[0])
     }
 }

bellman/src/lib.rs

@@ -1,18 +1,16 @@
-extern crate ff;
-extern crate group;
-#[cfg(feature = "pairing")]
-extern crate pairing;
-extern crate rand_core;
 
-extern crate bit_vec;
+
-extern crate blake2s_simd;
+
-extern crate byteorder;
+
-extern crate futures;
+
+
+
+
+
 
 #[cfg(feature = "multicore")]
 extern crate crossbeam;
-#[cfg(feature = "multicore")]
+
-extern crate futures_cpupool;
 #[cfg(feature = "multicore")]
 extern crate num_cpus;
 
@@ -23,11 +21,9 @@ extern crate hex_literal;
 #[cfg(test)]
 extern crate rand;
 
-#[cfg(test)]
-extern crate rand_xorshift;
 
-#[cfg(test)]
+
-extern crate sha2;
+
 
 pub mod domain;
 pub mod gadgets;
@@ -230,7 +226,7 @@ impl Error for SynthesisError {
 }
 
 impl fmt::Display for SynthesisError {
-    fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
         if let &SynthesisError::IoError(ref e) = self {
             write!(f, "I/O error: ")?;
             e.fmt(f)
@@ -309,7 +305,7 @@ pub trait ConstraintSystem<E: ScalarEngine>: Sized {
 
 /// This is a "namespaced" constraint system which borrows a constraint system (pushing
 /// a namespace context) and, when dropped, pops out of the namespace context.
-pub struct Namespace<'a, E: ScalarEngine, CS: ConstraintSystem<E> + 'a>(&'a mut CS, PhantomData<E>);
+pub struct Namespace<'a, E: ScalarEngine, CS: ConstraintSystem<E>>(&'a mut CS, PhantomData<E>);
 
 impl<'cs, E: ScalarEngine, CS: ConstraintSystem<E>> ConstraintSystem<E> for Namespace<'cs, E, CS> {
     type Root = CS::Root;

bellman/src/multiexp.rs

@@ -153,7 +153,7 @@ fn multiexp_inner<Q, D, G, S>(
     mut skip: u32,
     c: u32,
     handle_trivial: bool,
-) -> Box<Future<Item = <G as CurveAffine>::Projective, Error = SynthesisError>>
+) -> Box<dyn Future<Item = <G as CurveAffine>::Projective, Error = SynthesisError>>
 where
     for<'a> &'a Q: QueryDensity,
     D: Send + Sync + 'static + Clone + AsRef<Q>,
@@ -256,7 +256,7 @@ pub fn multiexp<Q, D, G, S>(
     bases: S,
     density_map: D,
     exponents: Arc<Vec<<<G::Engine as ScalarEngine>::Fr as PrimeField>::Repr>>,
-) -> Box<Future<Item = <G as CurveAffine>::Projective, Error = SynthesisError>>
+) -> Box<dyn Future<Item = <G as CurveAffine>::Projective, Error = SynthesisError>>
 where
     for<'a> &'a Q: QueryDensity,
     D: Send + Sync + 'static + Clone + AsRef<Q>,

bellman/tests/mimc.rs

@@ -1,7 +1,7 @@
-extern crate bellman;
+
-extern crate ff;
+
-extern crate pairing;
+
-extern crate rand;
+
 
 // For randomness (during paramgen and proof generation)
 use rand::thread_rng;