From 1d377d10a1c86152a49b46f446557c150fda655d Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Tue, 20 Feb 2018 10:36:29 -0500
Subject: [PATCH] add handy helper for Cell<usize>, used for perf stats

---
 src/librustc/util/common.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/librustc/util/common.rs b/src/librustc/util/common.rs
index e1ae41f2472..96b77d351e2 100644
--- a/src/librustc/util/common.rs
+++ b/src/librustc/util/common.rs
@@ -373,3 +373,13 @@ fn test_to_readable_str() {
     assert_eq!("1_000_000", to_readable_str(1_000_000));
     assert_eq!("1_234_567", to_readable_str(1_234_567));
 }
+
+pub trait CellUsizeExt {
+    fn increment(&self);
+}
+
+impl CellUsizeExt for Cell<usize> {
+    fn increment(&self) {
+        self.set(self.get() + 1);
+    }
+}