gnu: Add rust-similar-asserts.

* gnu/packages/crates-io.scm (rust-similar-asserts-1): New variable.

gnu/packages/crates-io.scm

@@ -56532,6 +56532,32 @@ extensions.")
     (description "This package provides a diff library for Rust.")
     (license license:asl2.0)))
 
+(define-public rust-similar-asserts-1
+  (package
+    (name "rust-similar-asserts")
+    (version "1.2.0")
+    (source (origin
+              (method url-fetch)
+              (uri (crate-uri "similar-asserts" version))
+              (file-name (string-append name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "1789db0fm85p4zvy44b2jwdjgw6h2b51bi133kak2l1pl8qzbjb4"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-console" ,rust-console-0.15)
+        ("rust-serde" ,rust-serde-1)
+        ("rust-similar" ,rust-similar-2))
+       #:cargo-development-inputs
+       (("rust-serde" ,rust-serde-1))))
+    (home-page "https://github.com/mitsuhiko/similar-asserts")
+    (synopsis "Asserts macros with colorized diff output")
+    (description
+     "This crate provides @code{assert_eq!}-like macros with colorized
+diff output.")
+    (license license:asl2.0)))
+
 (define-public rust-simplelog-0.11
   (package
     (name "rust-simplelog")