[GHC] #9664: Add identity functor to base
GHC
ghc-devs at haskell.org
Sat Oct 4 07:59:47 UTC 2014
#9664: Add identity functor to base
-------------------------------------+-------------------------------------
Reporter: hvr | Owner: ekmett
Type: task | Status: new
Priority: normal | Milestone: 7.10.1
Component: Core Libraries | Version:
Keywords: | Operating System:
Architecture: Unknown/Multiple | Unknown/Multiple
Difficulty: Easy (less than 1 | Type of failure:
hour) | None/Unknown
Blocked By: | Test Case:
Related Tickets: | Blocking:
| Differential Revisions:
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`base` already provides a `Const`ant functor, but the even more useful
`Id`entity (or `Identity`) functor does not exist in `base` yet.
This was already [https://groups.google.com/forum/#!msg/haskell-core-
libraries/_nReDCbROew/Mdmf0zIloysJ proposed to the CLC back in early
2013], and already missed inclusion in GHC 7.8
However, in order to implement this, coordination with `transformers` is
desirable, as `transformers` currently provides a non-transforming
`Data.Functor.Identity`, and we'd like to avoid name clashes.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9664>
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