From b74d6922ff15d9f3bf39d317ccd7141518f4f5ec Mon Sep 17 00:00:00 2001
From: Michael Lamparski <diagonaldevice@gmail.com>
Date: Mon, 16 Apr 2018 16:34:09 -0400
Subject: smaller PR just to fix #50002

---
 src/liballoc/tests/str.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'src/liballoc/tests')

diff --git a/src/liballoc/tests/str.rs b/src/liballoc/tests/str.rs
index a3f4c385fe2..e3f198f7362 100644
--- a/src/liballoc/tests/str.rs
+++ b/src/liballoc/tests/str.rs
@@ -401,6 +401,22 @@ fn test_str_get_maxinclusive() {
     }
 }
 
+#[test]
+fn test_str_slicemut_rangetoinclusive_ok() {
+    let mut s = "abcαβγ".to_owned();
+    let s: &mut str = &mut s;
+    &mut s[..=3]; // before alpha
+    &mut s[..=5]; // after alpha
+}
+
+#[test]
+#[should_panic]
+fn test_str_slicemut_rangetoinclusive_notok() {
+    let mut s = "abcαβγ".to_owned();
+    let s: &mut str = &mut s;
+    &mut s[..=4]; // middle of alpha, which is 2 bytes long
+}
+
 #[test]
 fn test_is_char_boundary() {
     let s = "ศไทย中华Việt Nam β-release 🐱123";
-- 
cgit 1.4.1-3-g733a5