[GHC] #13520: instance Alternative ZipList
GHC
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Fri Apr 7 15:58:33 UTC 2017
#13520: instance Alternative ZipList
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Reporter: Iceland_jack | Owner: (none)
Type: feature request | Status: closed
Priority: normal | Milestone: 8.4.1
Component: libraries/base | Version: 8.0.1
Resolution: fixed | Keywords: newcomer
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s): Phab:D3416
Wiki Page: |
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Comment (by Iceland_jack):
Cale from `#haskell` points out the following:
{{{
<Cale> Iceland_jack: I think it probably ought to be the one which uses
Semigroup's (<>) to combine corresponding elements.
<Cale> Iceland_jack: Then you can recover the instance there by using the
First semigroup
}}}
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13520#comment:8>
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