Added docs about rand's use of const generics

README.md

@@ -128,6 +128,8 @@ Additionally, these features configure Rand:
 -   `nightly` enables some optimizations requiring nightly Rust
 -   `simd_support` (experimental) enables sampling of SIMD values
     (uniformly random SIMD integers and floats), requiring nightly Rust
+-   `min_const_gen` enables generating random arrays of 
+    any size using min-const-generics, requiring Rust ≥ 1.51.
 
 Note that nightly features are not stable and therefore not all library and
 compiler versions will be compatible. This is especially true of Rand's

src/distributions/other.rs

@@ -186,6 +186,7 @@ tuple_impl! {A, B, C, D, E, F, G, H, I, J}
 tuple_impl! {A, B, C, D, E, F, G, H, I, J, K}
 tuple_impl! {A, B, C, D, E, F, G, H, I, J, K, L}
 
+#[cfg_attr(doc_cfg, doc(cfg(feature = "min_const_gen")))]
 #[cfg(feature = "min_const_gen")]
 impl<T, const N: usize> Distribution<[T; N]> for Standard
 where Standard: Distribution<T>

src/rng.rs

@@ -392,6 +392,7 @@ macro_rules! impl_fill {
 impl_fill!(u16, u32, u64, usize, u128,);
 impl_fill!(i8, i16, i32, i64, isize, i128,);
 
+#[cfg_attr(doc_cfg, doc(cfg(feature = "min_const_gen")))]
 #[cfg(feature = "min_const_gen")]
 impl<T, const N: usize> Fill for [T; N]
 where [T]: Fill