Be more idiomatic.

storage-proofs/core/src/multi_proof.rs

@@ -1,7 +1,7 @@
 use bellperson::groth16;
 
 use crate::error::Result;
-use anyhow::Context;
+use anyhow::{ensure, Context};
 use paired::bls12_381::Bls12;
 use rayon::prelude::*;
 use std::io::{self, Read, Write};
@@ -45,11 +45,19 @@ impl<'a> MultiProof<'a> {
     ) -> Result<Self> {
         let num_proofs = partitions.unwrap_or(1);
 
-        let proofs = (0..num_proofs)
-            .into_par_iter()
-            .map(|i| groth16::Proof::read(&proof_bytes[GROTH_PROOF_SIZE * i..]))
+        let proofs = proof_bytes
+            .par_chunks(GROTH_PROOF_SIZE)
+            .take(num_proofs)
+            .map(groth16::Proof::read)
             .collect::<io::Result<Vec<_>>>()?;
 
+        ensure!(
+            num_proofs == proofs.len(),
+            "expected {} proofs but found only {}",
+            num_proofs,
+            proofs.len()
+        );
+
         Ok(Self::new(proofs, verifying_key))
     }