core: Fix wrapping assert when seeding Pcg64

diff --git a/libs/narcissus-core/src/rand.rs b/libs/narcissus-core/src/rand.rs
index 1a01910bdd2c6069383035fd15316ac4f60aa760..a8e2b424628fa24cf70edd6716680b770faa4d5e 100644 (file)
--- a/libs/narcissus-core/src/rand.rs
+++ b/libs/narcissus-core/src/rand.rs
@@ -15,7 +15,7 @@ impl Pcg64 {
     pub fn with_seed(seed: u128) -> Self {
         let mut rng = Self { state: 0 };
         let _ = rng.next_u64();
-        rng.state += seed;
+        rng.state = rng.state.wrapping_add(seed);
         let _ = rng.next_u64();
         rng
     }