gnu: Add julia-abstracttrees.

* gnu/packages/julia-xyz.scm (julia-abstracttrees-0.2.1): New variable.

gnu/packages/julia-xyz.scm

@@ -2125,3 +2125,27 @@ TextParse as a framework for implementing parsers for other formats.")
     (description "This package provides load and save support for CSV Files
 under the @code{FileIO.jl} package.")
     (license license:expat)))
+
+(define-public julia-abstracttrees
+  (package
+    (name "julia-abstracttrees")
+    (version "0.2.1")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/Keno/AbstractTrees.jl")
+             (commit (string-append "v" version))))
+       (file-name "AbstractTrees")
+       (sha256
+        (base32 "0w05zar1hlyqqx7zlzh05h78mjs9vsgaifn5z390crrhb1bgw4bj"))))
+    (propagated-inputs `(("julia-compat" ,julia-compat)))
+    (build-system julia-build-system)
+    (home-page "https://github.com/Keno/AbstractTrees.jl")
+    (synopsis "Abstract julia interfaces for working with trees")
+    (description "This package provides several utilities for working with
+tree-like data structures.  Most importantly, it defines the children method
+that any package that contains such a datastructure may import and extend in
+order to take advantage of any generic tree algorithm in this package (or
+other packages compatible with this package).")
+    (license license:expat)))