From 6d294e6bcb7a8bbefbce62ad8e553f4cae5bde3d Mon Sep 17 00:00:00 2001
From: Alex McArther <acmcarther@google.com>
Date: Tue, 23 Jan 2018 07:55:50 -0800
Subject: [PATCH] Make rustfmt-bin's CARGO_PKG_VERSION envvar optional

---
 src/bin/rustfmt.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/bin/rustfmt.rs b/src/bin/rustfmt.rs
index ba586e1fd91..5a9119cdb11 100644
--- a/src/bin/rustfmt.rs
+++ b/src/bin/rustfmt.rs
@@ -387,7 +387,7 @@ fn print_usage_to_stdout(opts: &Options, reason: &str) {
 fn print_version() {
     println!(
         "{}-nightly{}",
-        env!("CARGO_PKG_VERSION"),
+        option_env!("CARGO_PKG_VERSION").unwrap_or("unknown"),
         include_str!(concat!(env!("OUT_DIR"), "/commit-info.txt"))
     )
 }