1 files changed, 36 insertions, 0 deletions
diff --git a/tests/ui/traits/to-str.rs b/tests/ui/traits/to-str.rs
new file mode 100644
index 00000000000..9670edbfa2b
--- /dev/null
+++ b/tests/ui/traits/to-str.rs
@@ -0,0 +1,36 @@
+// run-pass
+#![allow(non_camel_case_types)]
+
+
+trait to_str {
+    fn to_string_(&self) -> String;
+}
+
+impl to_str for isize {
+    fn to_string_(&self) -> String { self.to_string() }
+}
+
+impl<T:to_str> to_str for Vec<T> {
+    fn to_string_(&self) -> String {
+        format!("[{}]",
+                self.iter()
+                    .map(|e| e.to_string_())
+                    .collect::<Vec<String>>()
+                    .join(", "))
+    }
+}
+
+pub fn main() {
+    assert_eq!(1.to_string_(), "1".to_string());
+    assert_eq!((vec![2, 3, 4]).to_string_(), "[2, 3, 4]".to_string());
+
+    fn indirect<T:to_str>(x: T) -> String {
+        format!("{}!", x.to_string_())
+    }
+    assert_eq!(indirect(vec![10, 20]), "[10, 20]!".to_string());
+
+    fn indirect2<T:to_str>(x: T) -> String {
+        indirect(x)
+    }
+    assert_eq!(indirect2(vec![1]), "[1]!".to_string());
+}