From 7b53bff3e6f1640bbd58fc96bde95507a0de2756 Mon Sep 17 00:00:00 2001
From: David Tolnay <dtolnay@gmail.com>
Date: Mon, 1 Jan 2024 20:03:07 -0800
Subject: [PATCH] Make env-dep:RUSTC_BOOTSTRAP get listed in probe's dep-info

---
 build/probe.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/build/probe.rs b/build/probe.rs
index dc00214..0dce6f5 100644
--- a/build/probe.rs
+++ b/build/probe.rs
@@ -27,3 +27,6 @@ impl Error for MyError {
         request.provide_ref(&self.0);
     }
 }
+
+// Include in sccache cache key.
+const _: Option<&str> = option_env!("RUSTC_BOOTSTRAP");