linux-kernel - [PATCH] rust: fix off-by-one line number in rustdoc tests

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Message-ID: <20251211182208.2791025-1-gary@kernel.org>
Date: Thu, 11 Dec 2025 18:22:07 +0000
From: Gary Guo <gary@...nel.org>
To: Brendan Higgins <brendan.higgins@...ux.dev>,
	David Gow <davidgow@...gle.com>,
	Rae Moar <raemoar63@...il.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <lossin@...nel.org>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>,
	Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>
Cc: linux-kselftest@...r.kernel.org,
	kunit-dev@...glegroups.com,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] rust: fix off-by-one line number in rustdoc tests

From: Gary Guo <gary@...yguo.net>

When the `#![allow]` line was added, the doctest line number anchor
isn't updated which causes the line number printed in kunit test to be
off-by-one.

Fixes: ab844cf32058 ("rust: allow `unreachable_pub` for doctests")
Signed-off-by: Gary Guo <gary@...yguo.net>
---
 scripts/rustdoc_test_gen.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/rustdoc_test_gen.rs b/scripts/rustdoc_test_gen.rs
index be05610496605..6fd9f5c84e2e4 100644
--- a/scripts/rustdoc_test_gen.rs
+++ b/scripts/rustdoc_test_gen.rs
@@ -206,7 +206,7 @@ macro_rules! assert_eq {{
 
     /// The anchor where the test code body starts.
     #[allow(unused)]
-    static __DOCTEST_ANCHOR: i32 = ::core::line!() as i32 + {body_offset} + 1;
+    static __DOCTEST_ANCHOR: i32 = ::core::line!() as i32 + {body_offset} + 2;
     {{
         #![allow(unreachable_pub, clippy::disallowed_names)]
         {body}

base-commit: 559e608c46553c107dbba19dae0854af7b219400
-- 
2.51.2