rollup merge of #20563: cmr/macro-input-future-proofing

src/test/compile-fail/macro-input-future-proofing.rs

@@ -0,0 +1,30 @@
+// 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.
+
+macro_rules! errors_everywhere {
+    ($ty:ty <) => (); //~ ERROR `$ty:ty` is followed by `<`, which is not allowed for `ty`
+    ($ty:ty < foo ,) => (); //~ ERROR `$ty:ty` is followed by `<`, which is not allowed for `ty`
+    ($ty:ty , ) => ();
+    ( ( $ty:ty ) ) => ();
+    ( { $ty:ty } ) => ();
+    ( [ $ty:ty ] ) => ();
+    ($bl:block < ) => ();
+    ($pa:pat >) => (); //~ ERROR `$pa:pat` is followed by `>`, which is not allowed for `pat`
+    ($pa:pat , ) => ();
+    ($pa:pat | ) => (); //~ ERROR `$pa:pat` is followed by `|`
+    ($pa:pat $pb:pat $ty:ty ,) => ();
+    //~^ ERROR `$pa:pat` is followed by `$pb:pat`, which is not allowed
+    //~^^ ERROR `$pb:pat` is followed by `$ty:ty`, which is not allowed
+    ($($ty:ty)* -) => (); //~ ERROR `$ty:ty` is followed by `-`
+    ($($a:ty, $b:ty)* -) => (); //~ ERROR `$b:ty` is followed by `-`
+    ($($ty:ty)-+) => (); //~ ERROR `$ty:ty` is followed by `-`, which is not allowed for `ty`
+}
+
+fn main() { }