Rollup merge of #89407 - pierwill:recommend-clean-E0514, r=davidtwco

Recommend running `cargo clean` in E0514 output This suggestion has worked for me before. Seems to me it could help others.
rust-lang · Oct 4, 2021 · 9381d7a · 9381d7a
2 parents 9e387cf + 7ed75ce
commit 9381d7a
Showing 1 changed file with 2 additions and 1 deletion.
diff --git 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();