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| -rw-r--r-- | gnu/packages/haskell.scm | 23 |
1 files changed, 23 insertions, 0 deletions
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") |