Fix SIMD tests

Unfortunately, `gen_range` can no longer accept SIMD types (because it
requires `PartialOrd`), therefore we have to call
`UniformSample::sample_single` directly.

src/distributions/uniform.rs

@@ -1160,7 +1160,7 @@ mod tests {
                     }
 
                     for _ in 0..1000 {
-                        let v: $ty = rng.gen_range(low..high);
+                        let v = <$ty as SampleUniform>::Sampler::sample_single(low, high, &mut rng);
                         assert!($le(low, v) && $lt(v, high));
                     }
                 }
@@ -1242,7 +1242,8 @@ mod tests {
                             assert!(low_scalar <= v && v < high_scalar);
                             let v = rng.sample(my_incl_uniform).extract(lane);
                             assert!(low_scalar <= v && v <= high_scalar);
-                            let v = rng.gen_range(low..high).extract(lane);
+                            let v = <$ty as SampleUniform>::Sampler
+                                ::sample_single(low, high, &mut rng).extract(lane);
                             assert!(low_scalar <= v && v < high_scalar);
                         }
 
@@ -1253,7 +1254,9 @@ mod tests {
 
                         assert_eq!(zero_rng.sample(my_uniform).extract(lane), low_scalar);
                         assert_eq!(zero_rng.sample(my_incl_uniform).extract(lane), low_scalar);
-                        assert_eq!(zero_rng.gen_range(low..high).extract(lane), low_scalar);
+                        assert_eq!(<$ty as SampleUniform>::Sampler
+                            ::sample_single(low, high, &mut zero_rng)
+                            .extract(lane), low_scalar);
                         assert!(max_rng.sample(my_uniform).extract(lane) < high_scalar);
                         assert!(max_rng.sample(my_incl_uniform).extract(lane) <= high_scalar);
 
@@ -1266,7 +1269,9 @@ mod tests {
                                 (-1i64 << $bits_shifted) as u64,
                             );
                             assert!(
-                                lowering_max_rng.gen_range(low..high).extract(lane) < high_scalar
+                                <$ty as SampleUniform>::Sampler
+                                    ::sample_single(low, high, &mut lowering_max_rng)
+                                    .extract(lane) < high_scalar
                             );
                         }
                     }
@@ -1312,9 +1317,9 @@ mod tests {
     fn test_float_assertions() {
         use super::SampleUniform;
         use std::panic::catch_unwind;
-        fn range<T: SampleUniform + PartialOrd>(low: T, high: T) {
+        fn range<T: SampleUniform>(low: T, high: T) {
             let mut rng = crate::test::rng(253);
-            rng.gen_range(low..high);
+            T::Sampler::sample_single(low, high, &mut rng);
         }
 
         macro_rules! t {