From c9a56cdc58bbb51ece4510f4e54ef2fe26b7b771 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume.gomez@huawei.com>
Date: Fri, 10 Sep 2021 20:20:10 +0200
Subject: [PATCH] Add help for E0463

---
 compiler/rustc_metadata/src/locator.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/compiler/rustc_metadata/src/locator.rs b/compiler/rustc_metadata/src/locator.rs
index d3512b6cf57..b6922e0d72a 100644
--- a/compiler/rustc_metadata/src/locator.rs
+++ b/compiler/rustc_metadata/src/locator.rs
@@ -1095,6 +1095,11 @@ impl CrateError {
                         == Symbol::intern(&sess.opts.debugging_opts.profiler_runtime)
                     {
                         err.note(&"the compiler may have been built without the profiler runtime");
+                    } else if crate_name.as_str().starts_with("rustc_") {
+                        err.help(
+                            "maybe you need to install the missing components with: \
+                             `rustup component add rust-src rustc-dev llvm-tools-preview`",
+                        );
                     }
                     err.span_label(span, "can't find crate");
                     err