Warn unused type aliases

3 files changed, 22 insertions, 0 deletions

diff --git a/src/test/compile-fail/issue-32119.rs b/src/test/compile-fail/issue-32119.rs
index 4743b779ef6..e630a01a593 100644
--- a/src/test/compile-fail/issue-32119.rs
+++ b/src/test/compile-fail/issue-32119.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![feature(rustc_attrs)]
+#![allow(dead_code)]
 
 pub type T = ();
 mod foo { pub use super::T; }
diff --git a/src/test/compile-fail/lint-dead-code-type-alias.rs b/src/test/compile-fail/lint-dead-code-type-alias.rs
new file mode 100644
index 00000000000..aaa01aa6bbe
--- /dev/null
+++ b/src/test/compile-fail/lint-dead-code-type-alias.rs
@@ -0,0 +1,20 @@
+// 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.
+
+#![deny(dead_code)]
+
+type Used = u8;
+type Unused = u8; //~ ERROR type alias is never used
+
+fn id(x: Used) -> Used { x }
+
+fn main() {
+    id(0);
+}
diff --git a/src/test/compile-fail/macro-tt-matchers.rs b/src/test/compile-fail/macro-tt-matchers.rs
index 945490cefb9..969f1500717 100644
--- a/src/test/compile-fail/macro-tt-matchers.rs
+++ b/src/test/compile-fail/macro-tt-matchers.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 #![feature(rustc_attrs)]
+#![allow(dead_code)]
 
 macro_rules! foo {
     ($x:tt) => (type Alias = $x<i32>;)