From 352b4e720e02455c3a13f9a87a01959429a6be79 Mon Sep 17 00:00:00 2001
From: Juniper Tyree <juniper.tyree@helsinki.fi>
Date: Thu, 11 Jan 2024 05:24:20 +0000
Subject: [PATCH] Add back missing Backup for SeaHash and WyHash rngs

---
 necsim/impls/no-std/src/cogs/rng/seahash.rs | 9 ++++++++-
 necsim/impls/no-std/src/cogs/rng/wyhash.rs  | 9 ++++++++-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/necsim/impls/no-std/src/cogs/rng/seahash.rs b/necsim/impls/no-std/src/cogs/rng/seahash.rs
index 1da7d2e9a..93cc87ecd 100644
--- a/necsim/impls/no-std/src/cogs/rng/seahash.rs
+++ b/necsim/impls/no-std/src/cogs/rng/seahash.rs
@@ -1,6 +1,6 @@
 use core::marker::PhantomData;
 
-use necsim_core::cogs::{MathsCore, PrimeableRng, RngCore};
+use necsim_core::cogs::{Backup, MathsCore, PrimeableRng, RngCore};
 
 use serde::{Deserialize, Serialize};
 
@@ -17,6 +17,13 @@ pub struct SeaHash<M: MathsCore> {
     marker: PhantomData<M>,
 }
 
+#[contract_trait]
+impl<M: MathsCore> Backup for SeaHash<M> {
+    unsafe fn backup_unchecked(&self) -> Self {
+        self.clone()
+    }
+}
+
 impl<M: MathsCore> RngCore<M> for SeaHash<M> {
     type Seed = [u8; 8];
 
diff --git a/necsim/impls/no-std/src/cogs/rng/wyhash.rs b/necsim/impls/no-std/src/cogs/rng/wyhash.rs
index eae21264c..c4fdeed68 100644
--- a/necsim/impls/no-std/src/cogs/rng/wyhash.rs
+++ b/necsim/impls/no-std/src/cogs/rng/wyhash.rs
@@ -1,6 +1,6 @@
 use core::marker::PhantomData;
 
-use necsim_core::cogs::{MathsCore, PrimeableRng, RngCore};
+use necsim_core::cogs::{Backup, MathsCore, PrimeableRng, RngCore};
 
 use serde::{Deserialize, Serialize};
 
@@ -23,6 +23,13 @@ pub struct WyHash<M: MathsCore> {
     marker: PhantomData<M>,
 }
 
+#[contract_trait]
+impl<M: MathsCore> Backup for WyHash<M> {
+    unsafe fn backup_unchecked(&self) -> Self {
+        self.clone()
+    }
+}
+
 impl<M: MathsCore> RngCore<M> for WyHash<M> {
     type Seed = [u8; 8];