Fix debug line info for macro expansions.

Macro expansions produce code tagged with debug locations that are completely different from the surrounding expressions.  This wrecks havoc on debugger's ability the step over source lines.

In order to have a good line stepping behavior in debugger, we overwrite debug locations of macro expansions with that of the outermost expansion site.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/test/debuginfo/auxiliary/macro-stepping.rs b/src/test/debuginfo/auxiliary/macro-stepping.rs
new file mode 100644
index 00000000000..1006b684a8c
--- /dev/null
+++ b/src/test/debuginfo/auxiliary/macro-stepping.rs
@@ -0,0 +1,20 @@
+// Copyright 2013-2016 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.
+
+// compile-flags:-g
+
+#![crate_type = "rlib"]
+
+#[macro_export]
+macro_rules! new_scope {
+    () => {
+        let x = 1;
+    }
+}