[Haskell-cafe] Monad of no `return` Proposal (MRP): Moving `return` out of `Monad`

Johan Tibell johan.tibell at gmail.com
Mon Oct 5 19:01:16 UTC 2015

On Mon, Oct 5, 2015 at 8:34 PM, Gregory Collins <greg at gregorycollins.net>

> On Mon, Oct 5, 2015 at 8:09 AM, Gershom B <gershomb at gmail.com> wrote:
>> My understanding of the argument here, which seems to make sense to me,
>> is that the AMP already introduced a significant breaking change with
>> regards to monads. Books and lecture notes have already not caught up to
>> this, by and large. Hence, by introducing a further change, which
>> _completes_ the general AMP project, then by the time books and lecture
>> notes are all updated, they will be able to tell a much nicer story than
>> the current one?
> This is a multi-year, "boil the ocean"-style project, affecting literally
> every Haskell user, and the end result after all of this labor is going to
> be... a slightly spiffier bike shed?
> Strongly -1 from me also. My experience over the last couple of years is
> that every GHC release breaks my libraries in annoying ways that require
> CPP to fix:
> ~/personal/src/snap λ  find . -name '*.hs' | xargs egrep
> '#if.*(MIN_VERSION)|(GLASGOW_HASKELL)' | wc -l
> 64
> As a user this is another bikeshedding change that is not going to benefit
> me at all. Maintaining a Haskell library can be an exasperating exercise of
> running on a treadmill to keep up with busywork caused by changes to the
> core language and libraries. My feeling is starting to become that the
> libraries committee is doing as much (if not more) to *cause* problems
> and work for me than it is doing to improve the common infrastructure.

On the libraries I maintain and have a copy of on my computer right now: 329
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