Hi and thank you both!

For disambiguation the tick may be required for syntactically empty and one element lists, right? As only these can be ambiguous at locations where a type is expected.

On Wed, Oct 20, 2021 at 3:29 PM Adam Gundry <adam@well-typed.com> wrote:

I've created a ticket to request disabling this warning by default:
https://gitlab.haskell.org/ghc/ghc/-/issues/20531

I'm not sure if this needs a full ghc-proposal.

Cheers,

Adam



On 18/10/2021 03:19, Richard Eisenberg wrote:
> As its author, I think -Wunticked-promoted-constructors is a misfeature. It was motivated by the fact that writing [True] when you mean '[True] produces a cascade of obscure kind errors, and so I thought it was good to encourage people to always write the ticks. But the feature does not achieve its goal: because errors squelch warnings, we do not see the warnings if there are any errors. Furthermore, I agree with Adam's post that I've come to prefer a style where we leave off the ticks (where possible).
>
> Bottom line: feel free to turn this warning off.
>
> Richard
>
>> On Oct 16, 2021, at 5:55 AM, Markus Läll <markus.l2ll@gmail.com> wrote:
>>
>> Hi!
>>
>> Is there any consensus on unticked promoted constructors -- are they generally safe to use?
>>
>> Currently the warning is part of -Wall, but having promoted constructors unticked is just aesthetically nicer.
>>
>>
>> Thanks,
>>
>> --
>> Markus Läll


--
Adam Gundry, Haskell Consultant
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--

Markus Läll

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