Support `use $crate;` with a future compatibility warning.

2 files changed, 33 insertions, 0 deletions

diff --git a/src/test/compile-fail/auxiliary/import_crate_var.rs b/src/test/compile-fail/auxiliary/import_crate_var.rs
new file mode 100644
index 00000000000..1dfc7a128aa
--- /dev/null
+++ b/src/test/compile-fail/auxiliary/import_crate_var.rs
@@ -0,0 +1,12 @@
+// 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.
+
+#[macro_export]
+macro_rules! m { () => { use $crate; } }
diff --git a/src/test/compile-fail/import-crate-var.rs b/src/test/compile-fail/import-crate-var.rs
new file mode 100644
index 00000000000..9f573945483
--- /dev/null
+++ b/src/test/compile-fail/import-crate-var.rs
@@ -0,0 +1,21 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// aux-build:import_crate_var.rs
+// error-pattern: `$crate` may not be imported
+// error-pattern: `use $crate;` was erroneously allowed and will become a hard error
+
+#![feature(rustc_attrs)]
+
+#[macro_use] extern crate import_crate_var;
+m!();
+
+#[rustc_error]
+fn main() {}