/var/lib/ghc/package.conf.d/fclabels-2.0.3.2.conf is in libghc-fclabels-dev 2.0.3.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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version: 2.0.3.2
id: fclabels-2.0.3.2-4EezQlp7n1w9uoh5Y3yxAt
key: fclabels-2.0.3.2-4EezQlp7n1w9uoh5Y3yxAt
license: BSD3
maintainer: Sebastiaan Visser <code@fvisser.nl>
homepage: https://github.com/sebastiaanvisser/fclabels
synopsis: First class accessor labels implemented as lenses.
description:
This package provides first class labels that can act as
bidirectional record fields. The labels can be derived
automatically using Template Haskell which means you don't have
to write any boilerplate yourself. The labels are implemented as
/lenses/ and are fully composable. Lenses can be used to /get/,
/set/ and /modify/ parts of a data type in a consistent way.
.
See "Data.Label" for an introductory explanation or see the
introductory blog post at
<http://fvisser.nl/post/2013/okt/1/fclabels-2.0.html>
.
* /Total and partial lenses/
.
Internally lenses do not used Haskell functions directly, but
are implemented as categories. Categories allow the lenses to be
run in custom computational contexts. This approach allows us to
make partial lenses that point to fields of multi-constructor
datatypes in an elegant way.
.
See "Data.Label.Partial" for the use of partial labels.
.
* /Monomorphic and polymorphic lenses/
.
We have both polymorphic and monomorphic lenses. Polymorphic
lenses allow updates that change the type. The types of
polymorphic lenses are slightly more verbose than their
monomorphic counterparts, but their usage is similar. Because
monomorphic lenses are built by restricting the types of
polymorphic lenses they are essentially the same and can be
freely composed with eachother.
.
See "Data.Label.Mono" and "Data.Label.Poly" for the difference
between polymorphic and monomorphic lenses.
.
* /Using fclabels/
.
To simplify working with labels we supply both a set of labels
for Haskell's base types, like lists, tuples, Maybe and Either,
and we supply a set of combinators for working with labels for
values in the Reader and State monad.
.
See "Data.Label.Base" and "Data.Label.Monadic" for more
information.
.
* /Changelog from 2.0.3.1 to 2.0.3.2/
.
> - Allow HUnit 1.5.*.
category: Data, Lenses
author: Sebastiaan Visser, Erik Hesselink, Chris Eidhof, Sjoerd Visscher
with lots of help and feedback from others.
exposed: True
exposed-modules:
Data.Label Data.Label.Base Data.Label.Derive Data.Label.Failing
Data.Label.Monadic Data.Label.Mono Data.Label.Partial
Data.Label.Point Data.Label.Poly Data.Label.Total
abi: 003dac01778bc7b7951a2829e5352e71
trusted: False
import-dirs: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.0.2/fclabels-2.0.3.2-4EezQlp7n1w9uoh5Y3yxAt
library-dirs: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.0.2/fclabels-2.0.3.2-4EezQlp7n1w9uoh5Y3yxAt
dynamic-library-dirs: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.0.2
data-dir: /usr/share/fclabels
hs-libraries: HSfclabels-2.0.3.2-4EezQlp7n1w9uoh5Y3yxAt
depends:
base-4.9.1.0 mtl-2.2.1-BLKBelFsPB3BoFeSWSOYj6
template-haskell-2.11.1.0 transformers-0.5.2.0
haddock-interfaces: /usr/lib/ghc-doc/haddock/fclabels-2.0.3.2/fclabels.haddock
haddock-html: /usr/share/doc/libghc-fclabels-doc/html/
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