1 files changed, 47 insertions, 0 deletions
diff --git a/third_party/rust/rand/src/distributions/weighted.rs b/third_party/rust/rand/src/distributions/weighted.rs
new file mode 100644
index 0000000000..846b9df9c2
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+++ b/third_party/rust/rand/src/distributions/weighted.rs
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+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Weighted index sampling
+//!
+//! This module is deprecated. Use [`crate::distributions::WeightedIndex`] and
+//! [`crate::distributions::WeightedError`] instead.
+
+pub use super::{WeightedIndex, WeightedError};
+
+#[allow(missing_docs)]
+#[deprecated(since = "0.8.0", note = "moved to rand_distr crate")]
+pub mod alias_method {
+    // This module exists to provide a deprecation warning which minimises
+    // compile errors, but still fails to compile if ever used.
+    use core::marker::PhantomData;
+    use alloc::vec::Vec;
+    use super::WeightedError;
+
+    #[derive(Debug)]
+    pub struct WeightedIndex<W: Weight> {
+        _phantom: PhantomData<W>,
+    }
+    impl<W: Weight> WeightedIndex<W> {
+        pub fn new(_weights: Vec<W>) -> Result<Self, WeightedError> {
+            Err(WeightedError::NoItem)
+        }
+    }
+
+    pub trait Weight {}
+    macro_rules! impl_weight {
+        () => {};
+        ($T:ident, $($more:ident,)*) => {
+            impl Weight for $T {}
+            impl_weight!($($more,)*);
+        };
+    }
+    impl_weight!(f64, f32,);
+    impl_weight!(u8, u16, u32, u64, usize,);
+    impl_weight!(i8, i16, i32, i64, isize,);
+    impl_weight!(u128, i128,);
+}