From eb6ae860e53568fa224c4c689af5aae7aeaf3383 Mon Sep 17 00:00:00 2001 From: Siniša Biđin Date: Tue, 18 Aug 2015 22:40:07 +0200 Subject: gnu: Add ghc-dlist. * gnu/packages/haskell.scm (ghc-dlist): New variable. Signed-off-by: Eric Bavier --- gnu/packages/haskell.scm | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm index 4c7374b378..225ebbc9e7 100644 --- a/gnu/packages/haskell.scm +++ b/gnu/packages/haskell.scm @@ -325,6 +325,29 @@ package.") package.") (license bsd-3))) +(define-public ghc-dlist + (package + (name "ghc-dlist") + (version "0.7.1.1") + (source + (origin + (method url-fetch) + (uri (string-append + "http://hackage.haskell.org/package/dlist/dlist-" + version + ".tar.gz")) + (sha256 + (base32 "1zayvxvkan2s2ixajdr3f5rn1gzhprzv6cww4cbpwjhzw0l7zc08")))) + (arguments `(#:tests? #f)) + (build-system haskell-build-system) + (home-page "https://github.com/spl/dlist") + (synopsis "Difference lists") + (description + "Difference lists are a list-like type supporting O(1) append. This is +particularly useful for efficient logging and pretty printing (e.g. with the +Writer monad), where list append quickly becomes too expensive.") + (license bsd-3))) + (define-public ghc-mtl (package (name "ghc-mtl") -- cgit 1.4.1