gnu: Add rust-rustc-ap-rustc-lexer-654.

* gnu/packages/crates-io.scm (rust-rustc-ap-rustc-lexer-654): New variable.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/packages/crates-io.scm

@@ -20230,6 +20230,31 @@ It is automatically published using the compiler repository at
 @url{https://www.github.com/rust-lang/rust}")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-rustc-ap-rustc-lexer-654
+  (package
+    (name "rust-rustc-ap-rustc-lexer")
+    (version "654.0.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "rustc-ap-rustc_lexer" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "19bx2z4gxxzqfjh9m11jp52lgdzz0k5fb0p1ad739bdc5cm4sciv"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-unicode-xid" ,rust-unicode-xid-0.2))))
+    (home-page "https://github.com/alexcrichton/rustc-auto-publish")
+    (synopsis "Automatically published versions of rustc macros")
+    (description
+     "Use the lexer used in the Rust compiler with this crate.
+It is automatically published using the compiler repository at
+@url{https://www.github.com/rust-lang/rust}.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-rustc-ap-rustc-macros-654
   (package
     (name "rust-rustc-ap-rustc-macros")