[Haskell-cafe] [ANN] acme-dont-1.2 - a "don't" construct

Richard Eisenberg rae at richarde.dev
Wed Apr 1 13:33:31 UTC 2020

Presumably, if we don't execute the argument of don't, we don't need to type-check it either. This suggests that, with -fdefer-type-errors -Wno-deferred-type-errors -Wno-deferred-out-of-scope-variables, `don't $` becomes a decent replacement for the `--` commenting operator, except that `don't` has the advantage of being indentation-aware in a `do` block. Perhaps with https://github.com/ghc-proposals/ghc-proposals/pull/216 <https://github.com/ghc-proposals/ghc-proposals/pull/216>, we can have `Not.do` introduce an indentation-aware block of comments. This would surely show off the power, elegance, and beauty of Haskell.


> On Apr 1, 2020, at 9:38 AM, Jack Kelly <jack at jackkelly.name> wrote:
> Hello all,
> I have taken over the maintainership of acme-dont, and am pleased to
> announce a new acme-dont release on Hackage[1].
> acme-dont provides a `don't` function, which does not execute its
> argument. For example, the following code will not print anything:
>    import Acme.Dont (don't)
>    quiet :: IO ()
>    quiet = don't $ putStrLn "You'll never see this on stdout"
> New in this release:
> * `don't` has been generalised from `Monad` to `Applicative`. If you
>  have been waiting since GHC 8.0.1's release in 2016[2] to use `don't` with
>  `-XApplicativeDo`, wait no longer.
> * A test suite, to ensure that `don't` does not do anything. Previous
>  versions could have been defined as `don't = void` for all we knew.
> Also, the acme-dont community now has a new home on sourcehut. On there,
> you can find the following invaluable resources:
> * A source repository[3], to track further developement and new ways of
>  not doing things, with a commit history reconstructed from the release
>  tarballs uploaded to Hackage.
> * A mailing list[4] for the acme-dont community to discuss the best ways
>  of not doing things.
> * A bug tracker[5] to handle reports, in case someone observes acme-dont
>  doing something.
> * Continuous integration[6], to ensure that acme-dont continues to not
>  do things across multiple versions of GHC.
> I would like to thank Gracjan Polak for uploading the initial releases
> of `acme-dont`, and for maintaining the package these past eleven
> years. I do not intend to betray the responsibility he has assigned me
> in handing over this critical package.
> Best,
> -- Jack
> [1]: https://hackage.haskell.org/package/acme-dont-1.2
> [2]: https://www.haskell.org/ghc/download_ghc_8_0_1
> [3]: https://git.sr.ht/~jack/acme-dont
> [4]: https://lists.sr.ht/~jack/acme-dont-discuss
> [5]: https://todo.sr.ht/~jack/acme-dont
> [6]: https://builds.sr.ht/~jack/acme-dont
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