From bbe54115873eca9d9a889be3d9eff0c01d2ba8be Mon Sep 17 00:00:00 2001
From: Jorge Aparicio <japaricious@gmail.com>
Date: Wed, 5 Apr 2017 21:11:22 -0500
Subject: document the implementation a bit more

---
 src/libsyntax/feature_gate.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/libsyntax')

diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs
index 66a813025c4..5f719001203 100644
--- a/src/libsyntax/feature_gate.rs
+++ b/src/libsyntax/feature_gate.rs
@@ -344,8 +344,8 @@ declare_features! (
     // See rust-lang/rfcs#1414. Allows code like `let x: &'static u32 = &42` to work.
     (active, rvalue_static_promotion, "1.15.1", Some(38865)),
 
-    // Used to preserve symbols
-    (active, used, "1.18.0", None),
+    // Used to preserve symbols (see llvm.used)
+    (active, used, "1.18.0", Some(40289)),
 );
 
 declare_features! (
-- 
cgit 1.4.1-3-g733a5