gnu: Add rust-envmnt-0.6.

* gnu/packages/crates-io.scm (rust-envmnt-0.6): New variable.

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

gnu/packages/crates-io.scm

@@ -1744,6 +1744,30 @@ char, u8 and u16.")
 is configured via an environment variable.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-envmnt-0.6
+  (package
+    (name "rust-envmnt")
+    (version "0.6.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "envmnt" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "12zkq3p999bypyxmjnpiqw9r3hmifb3bcikd7j3as1fdcbq01fyl"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       (("rust-indexmap" ,rust-indexmap-1.0))))
+    (home-page "https://github.com/sagiegurari/envmnt")
+    (synopsis "Environment variables utility functions")
+    (description
+     "Environment variables utility functions.")
+    (license license:asl2.0)))
+
 (define-public rust-fallible-iterator-0.2
   (package
     (name "rust-fallible-iterator")