Index: crc32fast/src/lib.rs
===================================================================
--- crc32fast.orig/src/lib.rs
+++ crc32fast/src/lib.rs
@@ -51,6 +51,9 @@ extern crate cfg_if;
 #[cfg(feature = "std")]
 use std as core;
 
+#[cfg(all(test,not(feature = "std")))]
+extern crate alloc;
+
 use core::fmt;
 use core::hash;
 
@@ -195,7 +198,8 @@ impl hash::Hasher for Hasher {
 #[cfg(test)]
 mod test {
     use super::Hasher;
-
+    #[cfg(not(feature = "std"))]
+    use alloc::vec::Vec;
     quickcheck! {
         fn combine(bytes_1: Vec<u8>, bytes_2: Vec<u8>) -> bool {
             let mut hash_a = Hasher::new();
Index: crc32fast/src/specialized/pclmulqdq.rs
===================================================================
--- crc32fast.orig/src/specialized/pclmulqdq.rs
+++ crc32fast/src/specialized/pclmulqdq.rs
@@ -204,6 +204,7 @@ unsafe fn get(a: &mut &[u8]) -> arch::__
 
 #[cfg(test)]
 mod test {
+    #[cfg(feature = "std")]
     quickcheck! {
         fn check_against_baseline(init: u32, chunks: Vec<(Vec<u8>, usize)>) -> bool {
             let mut baseline = super::super::super::baseline::State::new(init);
Index: crc32fast/benches/bench.rs
===================================================================
--- crc32fast.orig/benches/bench.rs
+++ crc32fast/benches/bench.rs
@@ -45,9 +45,13 @@ benchmark_group!(
     bench_kilobyte_baseline,
     bench_megabyte_baseline
 );
+#[cfg(feature = "std")]
 benchmark_group!(
     bench_specialized,
     bench_kilobyte_specialized,
     bench_megabyte_specialized
 );
+#[cfg(feature = "std")]
 benchmark_main!(bench_baseline, bench_specialized);
+#[cfg(not(feature = "std"))]
+benchmark_main!(bench_baseline);
Index: crc32fast/src/baseline.rs
===================================================================
--- crc32fast.orig/src/baseline.rs
+++ crc32fast/src/baseline.rs
@@ -70,6 +70,9 @@ pub(crate) fn update_slow(prev: u32, buf
 
 #[cfg(test)]
 mod test {
+    #[cfg(not(feature = "std"))]
+    use alloc::vec::Vec;
+
     #[test]
     fn slow() {
         assert_eq!(super::update_slow(0, b""), 0);