gnu: Add cl-trivial-arguments.

* gnu/packages/lisp-xyz.scm (cl-trivial-arguments, ecl-trivial-arguments,
  sbcl-trivial-arguments): New variables.

Signed-off-by: Guillaume Le Vaillant <glv@posteo.net>

gnu/packages/lisp-xyz.scm

@@ -3235,6 +3235,34 @@ client and server.")
 (define-public ecl-s-xml-rpc
   (sbcl-package->ecl-package sbcl-s-xml-rpc))
 
+(define-public sbcl-trivial-arguments
+  (let ((commit "ecd84ed9cf9ef8f1e873d7409e6bd04979372aa7")
+        (revision "1"))
+    (package
+      (name "sbcl-trivial-arguments")
+      (version (git-version "1.1.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/Shinmera/trivial-arguments")
+               (commit commit)))
+         (file-name (git-file-name "trivial-arguments" version))
+         (sha256
+          (base32 "02vaqfavhj8jqxnr68nnzvzshm8jbgcy6m9lvyv4daa6f7ihqf88"))))
+      (build-system asdf-build-system/sbcl)
+      (home-page "https://github.com/Shinmera/trivial-arguments")
+      (synopsis "Common Lisp library to retrieve a function's lambda-list")
+      (description
+       "This is a simple library to retrieve the argument list of a function.")
+      (license license:zlib))))
+
+(define-public ecl-trivial-arguments
+  (sbcl-package->ecl-package sbcl-trivial-arguments))
+
+(define-public cl-trivial-arguments
+  (sbcl-package->cl-source-package sbcl-trivial-arguments))
+
 (define-public sbcl-trivial-clipboard
   (let ((commit "afcd3743b842f5a81fc86dba60f9db59970f49c5"))
     (package