gnu: Add rust-fast-float-0.2.

* gnu/packages/crates-io.scm (rust-fast-float-0.2): New variable.

gnu/packages/crates-io.scm

@@ -15220,6 +15220,27 @@ implement features such as look-around and backtracking, which are not
 supported in purely NFA-based implementations.")
     (license license:expat)))
 
+(define-public rust-fast-float-0.2
+  (package
+    (name "rust-fast-float")
+    (version "0.2.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "fast-float" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0g7kfll3xyh99kc7r352lhljnwvgayxxa6saifb6725inikmyxlm"))))
+    (build-system cargo-build-system)
+    (arguments `(#:skip-build? #t))
+    (home-page "https://github.com/aldanor/fast-float-rust")
+    (synopsis "Fast floating-point number parser.")
+    (description
+     "This crate provides a fast decimal number parser from strings into
+floats.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-fastrand-1
   (package
     (name "rust-fastrand")