Implement From<RangeInclusive> for Uniform

Fixes rust-random#556.

Cargo.toml

@@ -25,6 +25,7 @@ alloc = ["rand_core/alloc"]  # enables Vec and Box support (without std)
 i128_support = [] # enables i128 and u128 support
 simd_support = [] # enables SIMD support
 serde1 = ["serde", "serde_derive", "rand_core/serde1"] # enables serialization for PRNGs
+rust_1_27 = [] # enables RangeInclusive support for Rust >= 1.27
 
 [workspace]
 members = ["rand_core", "rand_isaac"]

src/distributions/uniform.rs

@@ -276,6 +276,13 @@ impl<X: SampleUniform> From<::core::ops::Range<X>> for Uniform<X> {
     }
 }
 
+#[cfg(feature = "rust_1_27")]
+impl<X: SampleUniform> From<::core::ops::RangeInclusive<X>> for Uniform<X> {
+    fn from(r: ::core::ops::RangeInclusive<X>) -> Uniform<X> {
+        Uniform::new_inclusive(r.start(), r.end())
+    }
+}
+
 /// Helper trait similar to [`Borrow`] but implemented
 /// only for SampleUniform and references to SampleUniform in
 /// order to resolve ambiguity issues.
@@ -1060,4 +1067,16 @@ mod tests {
         assert_eq!(r.inner.low, 2.0);
         assert_eq!(r.inner.scale, 5.0);
     }
+
+    #[cfg(feature = "rust_1_27")]
+    #[test]
+    fn test_uniform_from_std_range_inclusive() {
+        let r = Uniform::from(2u32..=6);
+        assert_eq!(r.inner.low, 2);
+        assert_eq!(r.inner.range, 5);
+        let r = Uniform::from(2.0f64..=7.0);
+        assert_eq!(r.inner.low, 2.0);
+        assert!(r.inner.scale > 5.0);
+        assert!(r.inner.scale < 5.0 + 1e15);
+    }
 }