Use explicit features rather than implicit.

CHANGELOG.md

@@ -20,6 +20,7 @@ You may also find the [Upgrade Guide](https://rust-random.github.io/book/update.
 - Fix portability of `rand::distributions::Slice` (#1469)
 - Rename `rand::distributions` to `rand::distr` (#1470)
 - The `serde1` feature has been renamed `serde` (#1477)
+- The implicit feature `rand_chacha` has been removed. This is enabled by `std_rng`. (#1473)
 
 ## [0.9.0-alpha.1] - 2024-03-18
 - Add the `Slice::num_choices` method to the Slice distribution (#1402)

Cargo.toml

@@ -46,7 +46,7 @@ getrandom = ["rand_core/getrandom"]
 simd_support = ["zerocopy/simd-nightly"]
 
 # Option (enabled by default): enable StdRng
-std_rng = ["rand_chacha"]
+std_rng = ["dep:rand_chacha"]
 
 # Option: enable SmallRng
 small_rng = []
@@ -56,6 +56,9 @@ small_rng = []
 # Note: enabling this option is expected to affect reproducibility of results.
 unbiased = []
 
+# Option: enable logging
+log = ["dep:log"]
+
 [workspace]
 members = [
     "rand_core",

rand_core/Cargo.toml

@@ -27,6 +27,7 @@ all-features = true
 [features]
 std = ["alloc", "getrandom?/std"]
 alloc = []  # enables Vec and Box support without std
+getrandom = ["dep:getrandom"]
 serde = ["dep:serde"] # enables serde for BlockRng wrapper
 
 [dependencies]

rand_distr/Cargo.toml

@@ -30,6 +30,7 @@ alloc = ["rand/alloc"]
 std_math = ["num-traits/std"]
 
 serde = ["dep:serde", "rand/serde"]
+serde_with = ["dep:serde_with"]
 
 [dependencies]
 rand = { path = "..", version = "=0.9.0-alpha.1", default-features = false }