1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/single-use-lifetime/one-use-in-trait-method-argument.rs b/src/test/ui/single-use-lifetime/one-use-in-trait-method-argument.rs
new file mode 100644
index 00000000000..99e9eaf98ad
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+++ b/src/test/ui/single-use-lifetime/one-use-in-trait-method-argument.rs
@@ -0,0 +1,30 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Test that we DO warn for a lifetime on an impl used only in `&self`
+// in a trait method.
+
+#![deny(single_use_lifetime)]
+#![allow(dead_code)]
+#![allow(unused_variables)]
+
+struct Foo<'f> {
+    data: &'f u32
+}
+
+impl<'f> Iterator for Foo<'f> {
+    type Item = &'f u32;
+
+    fn next<'g>(&'g mut self) -> Option<Self::Item> { //~ ERROR `'g` only used once
+        None
+    }
+}
+
+fn main() { }