Auto merge of #22541 - Manishearth:rollup, r=Gankro 1.0.0-alpha.2

Continued from #22520

1 files changed, 26 insertions, 0 deletions

diff --git a/src/test/compile-fail/variance-use-covariant-struct-2.rs b/src/test/compile-fail/variance-use-covariant-struct-2.rs
new file mode 100644
index 00000000000..d8e1a5f5f1c
--- /dev/null
+++ b/src/test/compile-fail/variance-use-covariant-struct-2.rs
@@ -0,0 +1,26 @@
+// Copyright 2015 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 a covariant struct permits the lifetime of a reference to
+// be shortened.
+
+#![allow(dead_code)]
+#![feature(rustc_attrs)]
+
+struct SomeStruct<T>(T);
+
+fn foo<'min,'max>(v: SomeStruct<&'max ()>)
+                  -> SomeStruct<&'min ()>
+    where 'max : 'min
+{
+    v
+}
+
+#[rustc_error] fn main() { } //~ ERROR compilation successful