From 15e13a552e57501cf398f0bc1dac7a657900f16c Mon Sep 17 00:00:00 2001
From: Tony Arcieri <bascule@gmail.com>
Date: Thu, 23 Nov 2023 11:04:44 -0700
Subject: [PATCH] Fix benchmark build (#302)

Benchmarks weren't building without the `alloc` feature.

Also adds CI that ensures the benchmarks build with no features.
---
 .github/workflows/crypto-bigint.yml | 1 +
 benches/bench.rs                    | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/crypto-bigint.yml b/.github/workflows/crypto-bigint.yml
index ce28d0e5..1b9a3257 100644
--- a/.github/workflows/crypto-bigint.yml
+++ b/.github/workflows/crypto-bigint.yml
@@ -136,6 +136,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: 1.70.0
+      - run: cargo build --benches
       - run: cargo build --all-features --benches
 
   doc:
diff --git a/benches/bench.rs b/benches/bench.rs
index d39cf70d..acbd8b20 100644
--- a/benches/bench.rs
+++ b/benches/bench.rs
@@ -3,10 +3,13 @@ use criterion::{
 };
 use crypto_bigint::{
     modular::{DynResidue, DynResidueParams},
-    Limb, MultiExponentiate, NonZero, Random, Reciprocal, U128, U2048, U256,
+    Limb, NonZero, Random, Reciprocal, U128, U2048, U256,
 };
 use rand_core::OsRng;
 
+#[cfg(feature = "alloc")]
+use crypto_bigint::MultiExponentiate;
+
 fn bench_division<M: Measurement>(group: &mut BenchmarkGroup<'_, M>) {
     group.bench_function("div/rem, U256/U128, full size", |b| {
         b.iter_batched(
@@ -102,6 +105,7 @@ fn bench_montgomery_ops<M: Measurement>(group: &mut BenchmarkGroup<'_, M>) {
         )
     });
 
+    #[cfg(feature = "alloc")]
     for i in [1, 2, 3, 4, 10, 100] {
         group.bench_function(
             format!("multi_exponentiate for {i} bases, U256^U256"),