From dd64d20bea2d046aad897fe09533f12e60086cb3 Mon Sep 17 00:00:00 2001
From: Vinzent Steinberg <Vinzent.Steinberg@gmail.com>
Date: Mon, 19 Apr 2021 17:45:56 -0300
Subject: [PATCH] Try to fix tests on stable Rust

This required introducing a new "nightly" feature.
---
 .travis.yml                  | 7 ++++++-
 Cargo.toml                   | 4 +++-
 src/distribution/beta.rs     | 2 +-
 src/distribution/gamma.rs    | 2 +-
 src/distribution/internal.rs | 1 +
 src/lib.rs                   | 4 ++--
 6 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index c140f8c6..4483b13f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -33,7 +33,12 @@ before_script:
 script:
   - cargo fmt --all -- --check
   - cargo build
-  - cargo test
+  - >
+    if [[ "$TRAVIS_RUST_VERSION" == "nightly" ]]; then
+      cargo test --features nightly
+    else
+      cargo test
+    fi
 
 after_success: >
   if [[ "$TRAVIS_OS_NAME" == "linux" ]] && [[ "$TRAVIS_RUST_VERSION" == "stable" ]]; then
diff --git a/Cargo.toml b/Cargo.toml
index bb2a22fb..83699ea7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,10 +13,12 @@ repository = "https://github.com/boxtown/statrs"
 edition = "2018"
 
 [lib]
-
 name = "statrs"
 path = "src/lib.rs"
 
+[features]
+nightly = []
+
 [dependencies]
 rand = "0.8"
 nalgebra = { version = "0.26", features = ["rand"] }
diff --git a/src/distribution/beta.rs b/src/distribution/beta.rs
index d384bc5b..a477ff4d 100644
--- a/src/distribution/beta.rs
+++ b/src/distribution/beta.rs
@@ -369,7 +369,7 @@ impl Continuous<f64, f64> for Beta {
 }
 
 #[rustfmt::skip]
-#[cfg(test)]
+#[cfg(all(test, feature = "nightly"))]
 mod tests {
     use super::*;
     use crate::consts::ACC;
diff --git a/src/distribution/gamma.rs b/src/distribution/gamma.rs
index cbdf6d92..33435ab8 100644
--- a/src/distribution/gamma.rs
+++ b/src/distribution/gamma.rs
@@ -322,7 +322,7 @@ pub fn sample_unchecked<R: Rng + ?Sized>(rng: &mut R, shape: f64, rate: f64) ->
     }
 }
 
-#[cfg(test)]
+#[cfg(all(test, feature = "nightly"))]
 mod tests {
     use super::*;
     use crate::consts::ACC;
diff --git a/src/distribution/internal.rs b/src/distribution/internal.rs
index 016227f4..eebe53f3 100644
--- a/src/distribution/internal.rs
+++ b/src/distribution/internal.rs
@@ -18,6 +18,7 @@ pub mod test {
     use crate::consts::ACC;
     use crate::distribution::{Continuous, ContinuousCDF, Discrete, DiscreteCDF};
 
+    #[cfg(feature = "nightly")]
     #[macro_export]
     macro_rules! testing_boiler {
         ($arg:ty, $dist:ty) => {
diff --git a/src/lib.rs b/src/lib.rs
index 9970aea9..b8970d61 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -29,8 +29,8 @@
 #![allow(clippy::many_single_char_names)]
 #![allow(unused_imports)]
 #![forbid(unsafe_code)]
-#![cfg_attr(test, feature(unboxed_closures))]
-#![cfg_attr(test, feature(fn_traits))]
+#![cfg_attr(all(test, feature = "nightly"), feature(unboxed_closures))]
+#![cfg_attr(all(test, feature = "nightly"), feature(fn_traits))]
 
 #[macro_use]
 extern crate approx;