From ef4b3d9bfa9496f6b76ff1c6546c39f9c7c7331e Mon Sep 17 00:00:00 2001
From: topecongiro <seuchida@gmail.com>
Date: Mon, 4 Dec 2017 11:34:27 +0900
Subject: [PATCH] Inspect CFG_RELEASE_CHANNEL env var at compile time

---
 src/config.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/config.rs b/src/config.rs
index d7b5e8c6ee3..e0fae952d6b 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -24,9 +24,9 @@ use Summary;
 
 macro_rules! is_nightly_channel {
     () => {
-    env::var("CFG_RELEASE_CHANNEL")
-        .map(|c| c == "nightly")
-        .unwrap_or(false)
+        option_env!("CFG_RELEASE_CHANNEL")
+            .map(|c| c == "nightly")
+            .unwrap_or(false)
     }
 }