Function cargo::core::compiler::custom_build::insert_warnings_in_build_outputs

fn insert_warnings_in_build_outputs(
    build_script_outputs: Arc<Mutex<BuildScriptOutputs>>,
    id: PackageId,
    metadata_hash: Metadata,
    warnings: Vec<String>
)

When a build script run fails, store only warnings and nuke other outputs, as they are likely broken.