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Thu, 14 Aug 2025 22:32:41 -0700 (PDT) From: Jesung Yang To: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Alexandre Courbot Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, nouveau@lists.freedesktop.org, Jesung Yang Subject: [PATCH v2 3/5] rust: macros: prefix variable `span` with underscore Date: Fri, 15 Aug 2025 05:32:13 +0000 Message-Id: <1455d8540acc62ad3acc1dd8ead71b1ad38935da.1755235180.git.y.j3ms.n@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Prefix the variable `span` in `quote_spanned!()` macro with an underscore to silence unused variable warnings. The warning occurs when the macro is used without any uninterpolated identifiers. For example: // Triggers a warning: "unused variable: `span`" quote! { #foo } // This is fine quote! { Some(#foo) } There is no good reason to disallow such quoting patterns, so fix the warning instead. Tested-by: Alexandre Courbot Signed-off-by: Jesung Yang --- rust/macros/quote.rs | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/rust/macros/quote.rs b/rust/macros/quote.rs index 24764b04a07d..75367a93e0d3 100644 --- a/rust/macros/quote.rs +++ b/rust/macros/quote.rs @@ -57,8 +57,8 @@ macro_rules! quote_spanned { #[allow(clippy::vec_init_then_push)] { tokens =3D ::std::vec::Vec::new(); - let span =3D $span; - quote_spanned!(@proc tokens span $($tt)*); + let _span =3D $span; + quote_spanned!(@proc tokens _span $($tt)*); } ::proc_macro::TokenStream::from_iter(tokens) }}; --=20 2.39.5