[core libraries] Re: Proposal: Debug.Trace.traceWith

Michael Snoyman michael at snoyman.com
Tue Feb 20 06:24:03 UTC 2018

On Tue, Feb 20, 2018 at 8:22 AM, Gershom B <gershomb at gmail.com> wrote:

> From: Joachim Breitner <mail at joachim-breitner.de>
> > But on the other hand, pointfree.io tells me that you can write
> >
> > trace =<< f
> > trace =<< show . f
> >
> > so I'm not sure how urgent these are.
> Nifty! If we add this prominently to the docs in Data.Trace, wouldn’t
> that suit us better?
> If I’m not mistaken, those make use of the unwrapped reader monad? In my
> opinion, that is an instance that is confusing and unidiomatic to many
> people. I don’t think that “easy to write with unwrapped reader” is the
> same as “easy to write” (or “easy to understand”). I wouldn’t want core
> docs to recommend this as an approach.
> -g
I agree with Gershom.

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