Add Functor, Applicative, Monad instances for First, Last

This was proposed in 2011 [1] with no serious objections although wasn't implemented until it was again mentioned in 2014 [2].

[1] http://www.haskell.org/pipermail/libraries/2011-January/015552.html [2] http://www.haskell.org/pipermail/libraries/2014-June/023228.html

Trac metadata

Trac field	Value
Version	7.8.2
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed weight to 5

added Tfeature request Trac import labels

Trac metadata

Trac field	Value
Component	Compiler → libraries/base

added core libraries label

Attached file 0001-Add-Functor-Applicative-Monad-instances-for-First-La.patch (download).

Patch

Or see https://github.com/bgamari/ghc/tree/first-last-amf

Trac metadata

Trac field	Value
Differential revisions	→ D81

closed

This was merged in 9a7440c0/ghc.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

added Pnormal label