From a35550774b1c6f2e59012213de0632ccaf72fb23 Mon Sep 17 00:00:00 2001
From: Mark Rousskov <mark.simulacrum@gmail.com>
Date: Thu, 11 Feb 2021 19:57:59 -0500
Subject: [PATCH] Tell user how to fix CI file being not up to date

---
 src/tools/expand-yaml-anchors/src/main.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/tools/expand-yaml-anchors/src/main.rs b/src/tools/expand-yaml-anchors/src/main.rs
index f8cf18a9309ec..8992d165d5d50 100644
--- a/src/tools/expand-yaml-anchors/src/main.rs
+++ b/src/tools/expand-yaml-anchors/src/main.rs
@@ -76,7 +76,11 @@ impl App {
                         self.path(&path),
                         self.path(&dest_path)
                     ),
-                    Mode::Check => format!("{} is not up to date", self.path(&dest_path)),
+                    Mode::Check => format!(
+                        "{} is not up to date; please run \
+                        `x.py run src/tools/expand-yaml-anchors`.",
+                        self.path(&dest_path)
+                    ),
                 })?;
             }
         }