linux-kernel - Re: [PATCH v2 2/5] rust: macros: extend custom `quote!()` macro

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Message-Id: <DD5VAPG2QFWA.2A58AL13VHPN2@nvidia.com>
Date: Tue, 30 Sep 2025 13:58:22 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Jesung Yang" <y.j3ms.n@...il.com>, "Miguel Ojeda" <ojeda@...nel.org>,
 "Alex Gaynor" <alex.gaynor@...il.com>, "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>,
 "Alexandre Courbot" <acourbot@...dia.com>
Cc: <linux-kernel@...r.kernel.org>, <rust-for-linux@...r.kernel.org>,
 <nouveau@...ts.freedesktop.org>
Subject: Re: [PATCH v2 2/5] rust: macros: extend custom `quote!()` macro

Hi Jesung,

On Fri Aug 15, 2025 at 2:32 PM JST, Jesung Yang wrote:
> Extend the `quote_spanned!()` macro to support additional punctuation
> tokens: `->`, `<`, `>`, and `==`. This symbols are commonly needed when
> dealing with functions, generic bounds, and equality comparisons.
>
> Tested-by: Alexandre Courbot <acourbot@...dia.com>
> Signed-off-by: Jesung Yang <y.j3ms.n@...il.com>
> ---

Note that this patch doesn't apply cleanly in `rust-next`, I've had to
add the following on top of it.

I suggest waiting for -rc1 to be released and using it as a base for a
new version - hopefully this will also give time for more feedback to
come.

diff --git a/rust/macros/quote.rs b/rust/macros/quote.rs
index 76a99f7e01c4..bb6970fd2a26 100644
--- a/rust/macros/quote.rs
+++ b/rust/macros/quote.rs
@@ -147,33 +147,33 @@ macro_rules! quote_spanned {
         quote_spanned!(@proc $v $span $($tt)*);
     };
     (@proc $v:ident $span:ident -> $($tt:tt)*) => {
-        $v.push(::proc_macro::TokenTree::Punct(
+        $v.extend([::proc_macro::TokenTree::Punct(
                 ::proc_macro::Punct::new('-', ::proc_macro::Spacing::Joint)
-        ));
-        $v.push(::proc_macro::TokenTree::Punct(
+        )]);
+        $v.extend([::proc_macro::TokenTree::Punct(
                 ::proc_macro::Punct::new('>', ::proc_macro::Spacing::Alone)
-        ));
+        )]);
         quote_spanned!(@proc $v $span $($tt)*);
     };
     (@proc $v:ident $span:ident < $($tt:tt)*) => {
-        $v.push(::proc_macro::TokenTree::Punct(
+        $v.extend([::proc_macro::TokenTree::Punct(
                 ::proc_macro::Punct::new('<', ::proc_macro::Spacing::Alone)
-        ));
+        )]);
         quote_spanned!(@proc $v $span $($tt)*);
     };
     (@proc $v:ident $span:ident > $($tt:tt)*) => {
-        $v.push(::proc_macro::TokenTree::Punct(
+        $v.extend([::proc_macro::TokenTree::Punct(
                 ::proc_macro::Punct::new('>', ::proc_macro::Spacing::Alone)
-        ));
+        )]);
         quote_spanned!(@proc $v $span $($tt)*);
     };
     (@proc $v:ident $span:ident == $($tt:tt)*) => {
-        $v.push(::proc_macro::TokenTree::Punct(
+        $v.extend([::proc_macro::TokenTree::Punct(
                 ::proc_macro::Punct::new('=', ::proc_macro::Spacing::Joint)
-        ));
-        $v.push(::proc_macro::TokenTree::Punct(
+        )]);
+        $v.extend([::proc_macro::TokenTree::Punct(
                 ::proc_macro::Punct::new('=', ::proc_macro::Spacing::Alone)
-        ));
+        )]);
         quote_spanned!(@proc $v $span $($tt)*);
     };
     (@proc $v:ident $span:ident # $($tt:tt)*) => {