linux-kernel - [PATCH 16/18] rust: syn: remove `unicode-ident` dependency

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Message-ID: <20251110095025.1475896-17-ojeda@kernel.org>
Date: Mon, 10 Nov 2025 10:50:21 +0100
From: Miguel Ojeda <ojeda@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>
Cc: 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>,
	rust-for-linux@...r.kernel.org,
	linux-kbuild@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev
Subject: [PATCH 16/18] rust: syn: remove `unicode-ident` dependency

The `syn` crate depends on the `unicode-ident` crate to determine whether
characters have the XID_Start or XID_Continue properties according to
Unicode Standard Annex #31.

However, we only need ASCII identifiers in the kernel, thus we can
simplify the check and remove completely that dependency.

Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
---
 rust/syn/ident.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/rust/syn/ident.rs b/rust/syn/ident.rs
index 2c4b56505bec..03ccebf9c022 100644
--- a/rust/syn/ident.rs
+++ b/rust/syn/ident.rs
@@ -39,11 +39,11 @@ fn from(token: Token![_]) -> Ident {
 pub(crate) fn xid_ok(symbol: &str) -> bool {
     let mut chars = symbol.chars();
     let first = chars.next().unwrap();
-    if !(first == '_' || unicode_ident::is_xid_start(first)) {
+    if !(first == '_' || first.is_ascii_alphabetic()) {
         return false;
     }
     for ch in chars {
-        if !unicode_ident::is_xid_continue(ch) {
+        if !(ch == '_' || ch.is_ascii_alphanumeric()) {
             return false;
         }
     }
-- 
2.51.2