gnu: Add rust-unescape-0.1.

* gnu/packages/crates-io.scm (rust-unescape-0.1): New variable.

gnu/packages/crates-io.scm

@@ -70332,6 +70332,24 @@ arithmetic.")
      "Unchecked indexing wrapper using regular index syntax.")
     (license (list license:asl2.0 license:expat))))
 
+(define-public rust-unescape-0.1
+  (package
+    (name "rust-unescape")
+    (version "0.1.0")
+    (source (origin
+              (method url-fetch)
+              (uri (crate-uri "unescape" version))
+              (file-name (string-append name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0vlgws15n4kz8xq4igzr1f80nbiyr838k687hn6ly8a36an7vffc"))))
+    (build-system cargo-build-system)
+    (home-page "https://github.com/saghm/unescape-rs")
+    (synopsis "Unescapes strings")
+    (description
+     "Unescapes strings with escape sequences written out as literal characters.")
+    (license license:expat)))
+
 (define-public rust-ungrammar-1
   (package
     (name "rust-ungrammar")