Address new rustc warnings around unused variables

diff --git a/src/crypto/bigint.rs b/src/crypto/bigint.rs
index 4bd6f372aef071991411c9cf6ee1f581a4935653..a9245a47884866d2669ecb6eb2035c6a208ff257 100644 (file)
--- a/src/crypto/bigint.rs
+++ b/src/crypto/bigint.rs
@@ -104,7 +104,7 @@ macro_rules! negate { ($v: ident) => { {
                $v[i] ^= 0xffff_ffff_ffff_ffff;
                i += 1;
        }
-       add_u64!($v, 1);
+       let _ = add_u64!($v, 1);
 } } }
 
 /// Doubles in-place, returning an overflow flag, in which case one out-of-bounds high bit is
@@ -985,7 +985,8 @@ impl<M: PrimeModulus<U256>> U256Mod<M> {
                        // should be able to do it at compile time alone.
                        let r_minus_one = [0xffff_ffff_ffff_ffff; 4];
                        let (mut r_mod_prime, _) = sub_4(&r_minus_one, &M::PRIME.0);
-                       add_u64!(r_mod_prime, 1);
+                       let r_mod_prime_overflow = add_u64!(r_mod_prime, 1);
+                       assert!(!r_mod_prime_overflow);
                        let r_squared = sqr_4(&r_mod_prime);
                        let mut prime_extended = [0; 8];
                        let prime = M::PRIME.0;
@@ -1183,7 +1184,8 @@ impl<M: PrimeModulus<U384>> U384Mod<M> {
                        // should be able to do it at compile time alone.
                        let r_minus_one = [0xffff_ffff_ffff_ffff; 6];
                        let (mut r_mod_prime, _) = sub_6(&r_minus_one, &M::PRIME.0);
-                       add_u64!(r_mod_prime, 1);
+                       let r_mod_prime_overflow = add_u64!(r_mod_prime, 1);
+                       assert!(!r_mod_prime_overflow);
                        let r_squared = sqr_6(&r_mod_prime);
                        let mut prime_extended = [0; 12];
                        let prime = M::PRIME.0;