From 25275b07bb3a2b19f0955445c09c13b2b9973b87 Mon Sep 17 00:00:00 2001
From: Eric Huss <eric@huss.org>
Date: Sun, 16 Feb 2020 09:29:25 -0800
Subject: [PATCH] Add new/old rustflags to fingerprint log.

---
 src/cargo/core/compiler/fingerprint.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/cargo/core/compiler/fingerprint.rs b/src/cargo/core/compiler/fingerprint.rs
index 75250a3212f..ce0dee7e6f9 100644
--- a/src/cargo/core/compiler/fingerprint.rs
+++ b/src/cargo/core/compiler/fingerprint.rs
@@ -653,7 +653,11 @@ impl Fingerprint {
             bail!("profile configuration has changed")
         }
         if self.rustflags != old.rustflags {
-            bail!("RUSTFLAGS has changed")
+            bail!(
+                "RUSTFLAGS has changed: {:?} != {:?}",
+                self.rustflags,
+                old.rustflags
+            )
         }
         if self.metadata != old.metadata {
             bail!("metadata changed")