From 3bf076e76b2afde77f1c0d2c763cef32407f0465 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Linus=20F=C3=A4rnstrand?= <faern@faern.net>
Date: Tue, 23 Mar 2021 21:27:38 +0100
Subject: [PATCH] Add test for Result::into_err

---
 library/core/tests/result.rs | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/library/core/tests/result.rs b/library/core/tests/result.rs
index 5fcd7b4d3a327..c461ab380ad3d 100644
--- a/library/core/tests/result.rs
+++ b/library/core/tests/result.rs
@@ -225,6 +225,28 @@ pub fn test_into_ok() {
     assert_eq!(infallible_op2().into_ok(), 667);
 }
 
+#[test]
+pub fn test_into_err() {
+    fn until_error_op() -> Result<!, isize> {
+        Err(666)
+    }
+
+    assert_eq!(until_error_op().into_err(), 666);
+
+    enum MyNeverToken {}
+    impl From<MyNeverToken> for ! {
+        fn from(never: MyNeverToken) -> ! {
+            match never {}
+        }
+    }
+
+    fn until_error_op2() -> Result<MyNeverToken, isize> {
+        Err(667)
+    }
+
+    assert_eq!(until_error_op2().into_err(), 667);
+}
+
 #[test]
 fn test_try() {
     fn try_result_some() -> Option<u8> {