Use a proper future-compatibility lint

1 files changed, 26 insertions, 0 deletions

diff --git a/src/test/compile-fail/defaulted-unit-warning.rs b/src/test/compile-fail/defaulted-unit-warning.rs
new file mode 100644
index 00000000000..7a15ac025ef
--- /dev/null
+++ b/src/test/compile-fail/defaulted-unit-warning.rs
@@ -0,0 +1,26 @@
+// 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(resolve_trait_on_defaulted_unit)]
+
+trait Deserialize {
+    fn deserialize() -> Result<Self, String>
+}
+
+fn doit() -> Result<(), String> {
+    let _ = Deserialize::deserialize()?;
+    //~^ ERROR attempt to resolve a trait
+    Ok(())
+}
+
+fn main() {
+    doit();
+}
+