From 5556afd5241d64aad9a853627a12d6c19d5f4a54 Mon Sep 17 00:00:00 2001
From: Rob Ede <robjtede@icloud.com>
Date: Sun, 28 Nov 2021 01:19:57 +0000
Subject: [PATCH] fix bytestring test on older rust versions

---
 bytestring/Cargo.toml |  1 +
 bytestring/src/lib.rs | 16 +++++++++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/bytestring/Cargo.toml b/bytestring/Cargo.toml
index d58af564..6be9eed2 100644
--- a/bytestring/Cargo.toml
+++ b/bytestring/Cargo.toml
@@ -25,3 +25,4 @@ serde = { version = "1.0", optional = true }
 ahash = { version = "0.7.6", default-features = false }
 serde_json = "1.0"
 static_assertions = "1.1"
+rustversion = "1"
diff --git a/bytestring/src/lib.rs b/bytestring/src/lib.rs
index d9c5a253..ecf21c95 100644
--- a/bytestring/src/lib.rs
+++ b/bytestring/src/lib.rs
@@ -231,10 +231,7 @@ mod serde {
 #[cfg(test)]
 mod test {
     use alloc::borrow::ToOwned;
-    use core::{
-        hash::{Hash, Hasher},
-        panic::{RefUnwindSafe, UnwindSafe},
-    };
+    use core::hash::{Hash, Hasher};
 
     use ahash::AHasher;
     use static_assertions::assert_impl_all;
@@ -242,10 +239,19 @@ mod test {
     use super::*;
 
     assert_impl_all!(ByteString: Send, Sync, Unpin, Sized);
-    assert_impl_all!(ByteString: UnwindSafe, RefUnwindSafe);
     assert_impl_all!(ByteString: Clone, Default, Eq, PartialOrd, Ord);
     assert_impl_all!(ByteString: fmt::Debug, fmt::Display);
 
+    #[rustversion::since(1.56)]
+    mod above_1_56_impls {
+        // `[Ref]UnwindSafe` traits were only in std until rust 1.56
+
+        use core::panic::{RefUnwindSafe, UnwindSafe};
+
+        use super::*;
+        assert_impl_all!(ByteString: UnwindSafe, RefUnwindSafe);
+    }
+
     #[test]
     fn test_partial_eq() {
         let s: ByteString = ByteString::from_static("test");