From fdd2043e66673926f475a12e3ee9ce4d1d50d7d4 Mon Sep 17 00:00:00 2001
From: Konrad Borowski <konrad@borowski.pw>
Date: Fri, 4 Oct 2019 23:59:37 +0200
Subject: [PATCH] Deprecate unreachable function

This is designed to merged after #162, as it deprecates
a function that should be no longer necessary on newer
Rust versions.
---
 .travis.yml | 2 +-
 lib.rs      | 9 ++++-----
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index ee744e1..2dc4702 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: rust
 rust:
-  - 1.20.0
+  - 1.36.0
   - nightly
   - beta
   - stable
diff --git a/lib.rs b/lib.rs
index cedf2bd..a993e1f 100644
--- a/lib.rs
+++ b/lib.rs
@@ -130,12 +130,11 @@ macro_rules! smallvec {
 /// Hint to the optimizer that any code path which calls this function is
 /// statically unreachable and can be removed.
 ///
-/// Equivalent to `std::hint::unreachable_unchecked` but works in older versions of Rust.
+/// Equivalent to `std::hint::unreachable_unchecked`.
 #[inline]
+#[deprecated(note = "Use std::hint::unreachable_unchecked instead")]
 pub unsafe fn unreachable() -> ! {
-    enum Void {}
-    let x: &Void = mem::transmute(1usize);
-    match *x {}
+    std::hint::unreachable_unchecked()
 }
 
 /// `panic!()` in debug builds, optimization hint in release.
@@ -144,7 +143,7 @@ macro_rules! debug_unreachable {
     () => { debug_unreachable!("entered unreachable code") };
     ($e:expr) => {
         if cfg!(not(debug_assertions)) {
-            unreachable();
+            std::hint::unreachable_unchecked();
         } else {
             panic!($e);
         }