From 961012e9833a304114dcea9956dc132a9b3afed2 Mon Sep 17 00:00:00 2001
From: Simon Sapin <simon.sapin@exyr.org>
Date: Thu, 20 Aug 2015 14:38:46 +0200
Subject: [PATCH] Add a test for char::to_lowercase mapping to more than one
 `char`.

I was wrong about Unicode not having such language-independent mapping.
---
 src/libcoretest/char.rs | 38 +++++++++++++++++---------------------
 1 file changed, 17 insertions(+), 21 deletions(-)

diff --git a/src/libcoretest/char.rs b/src/libcoretest/char.rs
index e077a0d8fe7f..f03f8e0ee782 100644
--- a/src/libcoretest/char.rs
+++ b/src/libcoretest/char.rs
@@ -55,28 +55,24 @@ fn test_to_digit() {
 
 #[test]
 fn test_to_lowercase() {
-    fn lower(c: char) -> char {
-        let mut it = c.to_lowercase();
-        let c = it.next().unwrap();
-        // As of Unicode version 7.0.0, `SpecialCasing.txt` has no lower-case mapping
-        // to multiple code points.
-        assert!(it.next().is_none());
-        c
+    fn lower(c: char) -> Vec<char> {
+        c.to_lowercase().collect()
     }
-    assert_eq!(lower('A'), 'a');
-    assert_eq!(lower('Ö'), 'ö');
-    assert_eq!(lower('ß'), 'ß');
-    assert_eq!(lower('Ü'), 'ü');
-    assert_eq!(lower('💩'), '💩');
-    assert_eq!(lower('Σ'), 'σ');
-    assert_eq!(lower('Τ'), 'τ');
-    assert_eq!(lower('Ι'), 'ι');
-    assert_eq!(lower('Γ'), 'γ');
-    assert_eq!(lower('Μ'), 'μ');
-    assert_eq!(lower('Α'), 'α');
-    assert_eq!(lower('Σ'), 'σ');
-    assert_eq!(lower('Dž'), 'dž');
-    assert_eq!(lower('fi'), 'fi');
+    assert_eq!(lower('A'), ['a']);
+    assert_eq!(lower('Ö'), ['ö']);
+    assert_eq!(lower('ß'), ['ß']);
+    assert_eq!(lower('Ü'), ['ü']);
+    assert_eq!(lower('💩'), ['💩']);
+    assert_eq!(lower('Σ'), ['σ']);
+    assert_eq!(lower('Τ'), ['τ']);
+    assert_eq!(lower('Ι'), ['ι']);
+    assert_eq!(lower('Γ'), ['γ']);
+    assert_eq!(lower('Μ'), ['μ']);
+    assert_eq!(lower('Α'), ['α']);
+    assert_eq!(lower('Σ'), ['σ']);
+    assert_eq!(lower('Dž'), ['dž']);
+    assert_eq!(lower('fi'), ['fi']);
+    assert_eq!(lower('İ'), ['i', '\u{307}']);
 }
 
 #[test]