add UI test

src/test/ui/macro_backtrace/auxiliary/ping.rs

@@ -0,0 +1,20 @@
+// Copyright 2017 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 the macro backtrace facility works (supporting file)
+
+// a non-local macro
+#[macro_export]
+macro_rules! ping {
+    () => {
+        pong!();
+    }
+}
+

src/test/ui/macro_backtrace/main.rs

@@ -0,0 +1,25 @@
+// Copyright 2017 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 the macro backtrace facility works
+// aux-build:ping.rs
+// rustc-env:RUST_MACRO_BACKTRACE
+
+#[macro_use] extern crate ping;
+
+// a local macro
+macro_rules! pong {
+    () => { syntax error };
+}
+
+fn main() {
+    pong!();
+    ping!();
+}

src/test/ui/macro_backtrace/main.stderr

@@ -0,0 +1,21 @@
+error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found `error`
+  --> $DIR/main.rs:19:20
+   |
+19 |     () => { syntax error };
+   |                   -^^^^^ unexpected token
+   |                   |
+   |                   expected one of 8 possible tokens here
+$DIR/main.rs:23:5: 23:13 note: in this expansion of pong! (defined in $DIR/main.rs)
+
+error: expected one of `!`, `.`, `::`, `;`, `?`, `{`, `}`, or an operator, found `error`
+  --> $DIR/main.rs:19:20
+   |
+19 |     () => { syntax error };
+   |                   -^^^^^ unexpected token
+   |                   |
+   |                   expected one of 8 possible tokens here
+$DIR/main.rs:24:5: 24:13 note: in this expansion of ping! (defined in <ping macros>)
+<ping macros>:1:11: 1:24 note: in this expansion of pong! (defined in $DIR/main.rs)
+
+error: aborting due to 2 previous errors
+