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[ Source: haskell-fclabels  ]

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first-class accessor labels; profiling libraries

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. Labels can be used to /get/, /set/ and /modify/ parts of a datatype in a consistent way.

See "Data.Label" for an introductory explanation.

Internally lenses are not tied to Haskell functions directly, but are implemented as arrows. Arrows 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 the "Data.Label.Maybe" module for the use of partial labels.

> -> 1.1.2 > - Added partial set/modify versions that act as identity > when the constructor field is not available.

 Author: Sebastiaan Visser, Erik Hesselink, Chris Eidhof, Sjoerd Visscher
with lots of help and feedback from others.
 Upstream-Maintainer: Sebastiaan Visser <>

This package contains the libraries compiled with profiling enabled.

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Architecture Version Package Size Installed Size Files
alpha (unofficial port) 197.3 kB2,328.0 kB [list of files]
amd64 135.5 kB1,310.0 kB [list of files]
arm64 179.2 kB2,233.0 kB [list of files]
armel 152.6 kB1,177.0 kB [list of files]
armhf 168.3 kB1,237.0 kB [list of files]
hppa (unofficial port) 246.2 kB2,249.0 kB [list of files]
hurd-i386 138.1 kB989.0 kB [list of files]
i386 138.0 kB990.0 kB [list of files]
kfreebsd-amd64 134.2 kB1,304.0 kB [list of files]
kfreebsd-i386 138.0 kB990.0 kB [list of files]
m68k (unofficial port) 211.8 kB1,745.0 kB [list of files]
mips 174.7 kB1,537.0 kB [list of files]
mips64el 189.5 kB2,208.0 kB [list of files]
mipsel 172.8 kB1,537.0 kB [list of files]
powerpc 138.5 kB1,216.0 kB [list of files]
powerpcspe (unofficial port) 180.1 kB1,656.0 kB [list of files]
ppc64 (unofficial port) 183.0 kB2,384.0 kB [list of files]
ppc64el 190.5 kB2,304.0 kB [list of files]
s390x 222.6 kB3,333.0 kB [list of files]
sh4 (unofficial port) 172.5 kB1,405.0 kB [list of files]
sparc64 (unofficial port) 257.1 kB4,059.0 kB [list of files]
x32 (unofficial port) 234.5 kB1,882.0 kB [list of files]