gnu: Add rust-synstructure-0.10.

* gnu/packages/crates-io.scm (rust-synstructure-0.10): New variable.

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

gnu/packages/crates-io.scm

@@ -6681,6 +6681,35 @@ and Jaro-Winkler.")
         ("rust-walkdir" ,rust-walkdir-2.2))))
     (properties '())))
 
+(define-public rust-synstructure-0.10
+  (package
+    (name "rust-synstructure")
+    (version "0.10.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "synstructure" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0grirdkgh2wl4hf9a3nbiazpgccxgq54kn52ms0xrr6njvgkwd82"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       (("rust-proc-macro2" ,rust-proc-macro2-0.4)
+        ("rust-quote" ,rust-quote-1.0)
+        ("rust-syn" ,rust-syn-0.15)
+        ("rust-unicode-xid" ,rust-unicode-xid-0.1))
+       #:cargo-development-inputs
+       (("rust-synstructure-test-traits" ,rust-synstructure-test-traits-0.1))))
+    (home-page "https://github.com/mystor/synstructure")
+    (synopsis "Helper methods and macros for custom derives")
+    (description
+     "Helper methods and macros for custom derives.")
+    (license license:expat)))
+
 (define-public rust-synstructure-test-traits-0.1
   (package
     (name "rust-synstructure-test-traits")