From 7ed75ce97c634ff63cba27d979c9574c86c85c1f Mon Sep 17 00:00:00 2001
From: pierwill <pierwill@users.noreply.github.com>
Date: Thu, 30 Sep 2021 12:52:51 -0500
Subject: [PATCH] Recommend running `cargo clean` in E0514 output

---
 compiler/rustc_metadata/src/locator.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_metadata/src/locator.rs b/compiler/rustc_metadata/src/locator.rs
index b6922e0d72a06..80963c9658e3d 100644
--- a/compiler/rustc_metadata/src/locator.rs
+++ b/compiler/rustc_metadata/src/locator.rs
@@ -1030,7 +1030,8 @@ impl CrateError {
                         add,
                     );
                     err.help(&format!(
-                        "please recompile that crate using this compiler ({})",
+                        "please recompile that crate using this compiler ({}) \
+                         (consider running `cargo clean` first)",
                         rustc_version(),
                     ));
                     let mismatches = locator.crate_rejections.via_version.iter();