diff options
| -rw-r--r-- | gnu/packages/haskell-xyz.scm | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/gnu/packages/haskell-xyz.scm b/gnu/packages/haskell-xyz.scm index 1ff6f30141..6a4d958490 100644 --- a/gnu/packages/haskell-xyz.scm +++ b/gnu/packages/haskell-xyz.scm @@ -12127,6 +12127,45 @@ from a shell. The @code{tldr} pages are a community effort to simplify the man pages with practical examples.") (license license:bsd-3))) +(define-public ghc-transformers + (package + (name "ghc-transformers") + (version "0.5.6.2") + (source + (origin + (method url-fetch) + (uri (string-append + "mirror://hackage/package/transformers/transformers-" + version + ".tar.gz")) + (sha256 + (base32 + "0v66j5k0xqk51pmca55wq192qyw2p43s2mgxlz4f95q2c1fpjs5n")))) + (build-system haskell-build-system) + (home-page + "http://hackage.haskell.org/package/transformers") + (synopsis "Concrete functor and monad transformers") + (description + "Transformers provides functor and monad transformers, inspired by the +paper \"Functional Programming with Overloading and Higher-Order +Polymorphism\", by Mark P Jones, in Advanced School of Functional Programming, +1995 @url{http://web.cecs.pdx.edu/~mpj/pubs/springschool.html}. + +This package contains: +@itemize +@item the monad transformer class (in @code{Control.Monad.Trans.Class}) +@item concrete functor and monad transformers, each with associated operations +and functions to lift operations associated with other transformers. +@end itemize + +This package can be used on its own in portable Haskell code, in which case +operations need to be manually lifted through transformer stacks (see +@code{Control.Monad.Trans.Class} for some examples). Alternatively, it can be +used with the non-portable monad classes in the mtl or monads-tf packages, +which automatically lift operations introduced by monad transformers through +other transformers.") + (license license:bsd-3))) + (define-public ghc-transformers-base (package (name "ghc-transformers-base") |