From b865c1f28ca2459b27c1ac83829aa45085f1b50e Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@gmail.com>
Date: Tue, 9 Sep 2014 22:38:23 -0700
Subject: [PATCH] Don't ICE on macros with -Z show-span

Closes #17115
---
 src/librustc/front/show_span.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/librustc/front/show_span.rs b/src/librustc/front/show_span.rs
index 36db4e422c1..1a59b3603de 100644
--- a/src/librustc/front/show_span.rs
+++ b/src/librustc/front/show_span.rs
@@ -28,6 +28,10 @@ impl<'a> Visitor<()> for ShowSpanVisitor<'a> {
         self.sess.span_note(e.span, "expression");
         visit::walk_expr(self, e, ());
     }
+
+    fn visit_mac(&mut self, macro: &ast::Mac, e: ()) {
+        visit::walk_mac(self, macro, e);
+    }
 }
 
 pub fn run(sess: &Session, krate: &ast::Crate) {