Add benchmarks for Beta

rand_distr/benches/distributions.rs

@@ -7,6 +7,7 @@
 // except according to those terms.
 
 #![feature(test)]
+#![feature(custom_inner_attributes)]
 
 // Rustfmt slits many macro invocations to shorten lines; in this case longer-lines are more readable
 #![rustfmt::skip]
@@ -211,6 +212,10 @@ distr_float!(distr_normal, f64, Normal::new(-1.23, 4.56).unwrap());
 distr_float!(distr_log_normal, f64, LogNormal::new(-1.23, 4.56).unwrap());
 distr_float!(distr_gamma_large_shape, f64, Gamma::new(10., 1.0).unwrap());
 distr_float!(distr_gamma_small_shape, f64, Gamma::new(0.1, 1.0).unwrap());
+distr_float!(distr_beta_small_param, f64, Beta::new(0.1, 0.1).unwrap());
+distr_float!(distr_beta_large_param_similar, f64, Beta::new(101., 95.).unwrap());
+distr_float!(distr_beta_large_param_different, f64, Beta::new(10., 1000.).unwrap());
+distr_float!(distr_beta_mixed_param, f64, Beta::new(0.5, 100.).unwrap());
 distr_float!(distr_cauchy, f64, Cauchy::new(4.2, 6.9).unwrap());
 distr_float!(distr_triangular, f64, Triangular::new(0., 1., 0.9).unwrap());
 distr_int!(distr_binomial, u64, Binomial::new(20, 0.7).unwrap());