From 88c7355cb6aff50a64c699c0d19442ce672bc59e Mon Sep 17 00:00:00 2001
From: messense <messense@icloud.com>
Date: Sun, 19 Jun 2022 13:32:40 +0800
Subject: [PATCH] Don't warn if packages not listed in `cargo metadata` are
 coming from Rust sysroot

---
 src/compile.rs | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/compile.rs b/src/compile.rs
index 170bfb5da..df41118a7 100644
--- a/src/compile.rs
+++ b/src/compile.rs
@@ -399,11 +399,17 @@ fn compile_target(
                 let crate_name = match package_in_metadata {
                     Some(package) => &package.name,
                     None => {
-                        // This is a spurious error I don't really understand
-                        println!(
-                            "⚠️  Warning: The package {} wasn't listed in `cargo metadata`",
-                            artifact.package_id
-                        );
+                        let package_id = &artifact.package_id;
+                        // Ignore the package if it's coming from Rust sysroot when compiling with `-Zbuild-std`
+                        if !package_id.repr.contains("rustup")
+                            && !package_id.repr.contains("rustlib")
+                        {
+                            // This is a spurious error I don't really understand
+                            println!(
+                                "⚠️  Warning: The package {} wasn't listed in `cargo metadata`",
+                                package_id
+                            );
+                        }
                         continue;
                     }
                 };