[GHC] #15961: TH 'Lift' instance for 'NonEmpty'
GHC
ghc-devs at haskell.org
Wed Nov 28 22:29:15 UTC 2018
#15961: TH 'Lift' instance for 'NonEmpty'
-------------------------------------+-------------------------------------
Reporter: fr33domlover | Owner: (none)
Type: feature request | Status: new
Priority: normal | Milestone: 8.6.3
Component: Template Haskell | Version: 8.6.2
Resolution: | Keywords: lift,
| instance, nonempty
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: Other | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by harpocrates):
Please avoid using the default `Data` implementations of `Lift` (or at
least explicitly define `lift = liftData`). For existing code, I would use
`-XStandaloneDeriving` and `-XDeriveLift`.
{{{
deriving instance Lift a => Lift (NonEmpty a)
}}}
I agree we should put instances in `template-haskell` now that `NonEmpty`
is in `base`. I'll put up a patch and we can see what others think.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15961#comment:2>
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