impl serde for rand_distr::WeightedAliasIndex; fix bounds for Uniform

rand_distr/Cargo.toml

@@ -20,7 +20,7 @@ default = ["std"]
 std = ["alloc", "rand/std"]
 alloc = ["rand/alloc"]
 std_math = ["num-traits/std"]
-serde1 = ["serde"]
+serde1 = ["serde", "rand/serde1"]
 
 [dependencies]
 rand = { path = "..", version = "0.8.0", default-features = false }

rand_distr/src/weighted_alias.rs

@@ -16,6 +16,8 @@ use core::iter::Sum;
 use core::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign};
 use rand::Rng;
 use alloc::{boxed::Box, vec, vec::Vec};
+#[cfg(feature = "serde1")]
+use serde::{Serialize, Deserialize};
 
 /// A distribution using weighted sampling to pick a discretely selected item.
 ///
@@ -64,6 +66,9 @@ use alloc::{boxed::Box, vec, vec::Vec};
 /// [`Uniform<u32>::sample`]: Distribution::sample
 /// [`Uniform<W>::sample`]: Distribution::sample
 #[cfg_attr(doc_cfg, doc(cfg(feature = "alloc")))]
+#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "serde1", serde(bound(serialize = "W: Serialize, W::Sampler: Serialize")))]
+#[cfg_attr(feature = "serde1", serde(bound(deserialize = "W: Deserialize<'de>, W::Sampler: Deserialize<'de>")))]
 pub struct WeightedAliasIndex<W: AliasableWeight> {
     aliases: Box<[u32]>,
     no_alias_odds: Box<[W]>,

src/distributions/uniform.rs

@@ -172,6 +172,8 @@ use serde::{Serialize, Deserialize};
 /// [`Rng::gen_range`]: Rng::gen_range
 #[derive(Clone, Copy, Debug)]
 #[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "serde1", serde(bound(serialize = "X::Sampler: Serialize")))]
+#[cfg_attr(feature = "serde1", serde(bound(deserialize = "X::Sampler: Deserialize<'de>")))]
 pub struct Uniform<X: SampleUniform>(X::Sampler);
 
 impl<X: SampleUniform> Uniform<X> {