From 3155b3101108dc9a3be32b6cb3cf33b9e1c45a0c Mon Sep 17 00:00:00 2001
From: Huon Wilson <dbau.pp+github@gmail.com>
Date: Thu, 8 Jan 2015 22:48:32 +1100
Subject: [PATCH] Let ToString work with unsized types, importantly, `str`.

---
 src/libcollections/string.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/libcollections/string.rs b/src/libcollections/string.rs
index 1bb0be05b1e82..317f03e1b7d52 100644
--- a/src/libcollections/string.rs
+++ b/src/libcollections/string.rs
@@ -932,7 +932,7 @@ pub trait ToString {
     fn to_string(&self) -> String;
 }
 
-impl<T: fmt::String> ToString for T {
+impl<T: fmt::String + ?Sized> ToString for T {
     fn to_string(&self) -> String {
         use core::fmt::Writer;
         let mut buf = String::new();
@@ -994,6 +994,12 @@ mod tests {
       assert_eq!(owned.as_ref().map(|s| s.as_slice()), Some("string"));
     }
 
+    #[test]
+    fn test_unsized_to_string() {
+        let s: &str = "abc";
+        let _: String = (*s).to_string();
+    }
+
     #[test]
     fn test_from_utf8() {
         let xs = b"hello".to_vec();