From df044ee754bfb05b9aa23178a72b1e6a8dc6ec65 Mon Sep 17 00:00:00 2001
From: bit-aloo <sshourya17@gmail.com>
Date: Wed, 28 Jan 2026 00:13:32 +0530
Subject: [PATCH] fix linking of postcard test

---
 crates/proc-macro-srv-cli/tests/bidirectional_postcard.rs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/crates/proc-macro-srv-cli/tests/bidirectional_postcard.rs b/crates/proc-macro-srv-cli/tests/bidirectional_postcard.rs
index 33ca1d791d..ba9657a9bb 100644
--- a/crates/proc-macro-srv-cli/tests/bidirectional_postcard.rs
+++ b/crates/proc-macro-srv-cli/tests/bidirectional_postcard.rs
@@ -1,4 +1,8 @@
 #![cfg(feature = "sysroot-abi")]
+#![cfg_attr(feature = "in-rust-tree", feature(rustc_private))]
+
+#[cfg(feature = "in-rust-tree")]
+extern crate rustc_driver as _;
 
 mod common {
     pub(crate) mod utils;