From 253979236e00a391fdce12943fd21b5e8c4656b1 Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Fri, 18 May 2012 19:06:56 -0700
Subject: [PATCH] print ids of patterns when doing --pretty identified

---
 src/rustc/driver/driver.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/rustc/driver/driver.rs b/src/rustc/driver/driver.rs
index ad669c1a4e4..33f82ccab75 100644
--- a/src/rustc/driver/driver.rs
+++ b/src/rustc/driver/driver.rs
@@ -276,7 +276,10 @@ fn pretty_print_input(sess: session, cfg: ast::crate_cfg, input: input,
             pprust::synth_comment(s, int::to_str(expr.id, 10u));
             pprust::pclose(s);
           }
-          _ { }
+          pprust::node_pat(s, pat) {
+            pp::space(s.s);
+            pprust::synth_comment(s, "pat " + int::to_str(pat.id, 10u));
+          }
         }
     }