add warnings for unused lifetime parameters

4 files changed, 68 insertions, 0 deletions

diff --git a/src/test/ui/single-use-lifetime/zero-uses-in-fn.rs b/src/test/ui/single-use-lifetime/zero-uses-in-fn.rs
new file mode 100644
index 00000000000..b71b189833a
--- /dev/null
+++ b/src/test/ui/single-use-lifetime/zero-uses-in-fn.rs
@@ -0,0 +1,19 @@
+// 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 when lifetime name is not used at all.
+
+#![deny(unused_lifetime)]
+#![allow(dead_code)]
+#![allow(unused_variables)]
+
+fn d<'a>() { } //~ ERROR `'a` never used
+
+fn main() { }
diff --git a/src/test/ui/single-use-lifetime/zero-uses-in-fn.stderr b/src/test/ui/single-use-lifetime/zero-uses-in-fn.stderr
new file mode 100644
index 00000000000..f1cdc6e495a
--- /dev/null
+++ b/src/test/ui/single-use-lifetime/zero-uses-in-fn.stderr
@@ -0,0 +1,14 @@
+error: lifetime parameter `'a` never used
+  --> $DIR/zero-uses-in-fn.rs:17:6
+   |
+LL | fn d<'a>() { } //~ ERROR `'a` never used
+   |      ^^
+   |
+note: lint level defined here
+  --> $DIR/zero-uses-in-fn.rs:13:9
+   |
+LL | #![deny(unused_lifetime)]
+   |         ^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+
diff --git a/src/test/ui/single-use-lifetime/zero-uses-in-impl.rs b/src/test/ui/single-use-lifetime/zero-uses-in-impl.rs
new file mode 100644
index 00000000000..6a09727015f
--- /dev/null
+++ b/src/test/ui/single-use-lifetime/zero-uses-in-impl.rs
@@ -0,0 +1,21 @@
+// 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 when lifetime name is not used at all.
+
+#![deny(unused_lifetime)]
+#![allow(dead_code)]
+#![allow(unused_variables)]
+
+struct Foo { }
+
+impl<'a> Foo { } //~ ERROR `'a` never used
+
+fn main() { }
diff --git a/src/test/ui/single-use-lifetime/zero-uses-in-impl.stderr b/src/test/ui/single-use-lifetime/zero-uses-in-impl.stderr
new file mode 100644
index 00000000000..d2dd26e68a2
--- /dev/null
+++ b/src/test/ui/single-use-lifetime/zero-uses-in-impl.stderr
@@ -0,0 +1,14 @@
+error: lifetime parameter `'a` never used
+  --> $DIR/zero-uses-in-impl.rs:19:6
+   |
+LL | impl<'a> Foo { } //~ ERROR `'a` never used
+   |      ^^
+   |
+note: lint level defined here
+  --> $DIR/zero-uses-in-impl.rs:13:9
+   |
+LL | #![deny(unused_lifetime)]
+   |         ^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+