[Haskell-cafe] New type of ($) operator in GHC 8.0 is problematic

Christopher Allen cma at bitemyapp.com
Fri Feb 5 19:16:56 UTC 2016

I just showed the type of ($) to my boss in our company chat who has been
using Haskell for 14 years. He'd played with Haskell prior to that, but 14
years ago is when he started postgrad and teaching Haskell. Here's what he

>what does that do?

He's been using Haskell in production for the last 5 years as well, I think.

Please simplify the type unless a pragma specific to levity is turned on.
As it happens, I like the name levity better than runtimerep, but neither
solve any pedagogical issues. YMMV.

On Fri, Feb 5, 2016 at 1:12 PM, Bardur Arantsson <spam at scientician.net>

> On 02/05/2016 08:05 PM, Christopher Allen wrote:
> > Changing the name doesn't fix the issue. The issue is the noise and the
> > referent, not the referrer. There's a habit of over-focusing on names in
> > programming communities. I think it'd be a mistake to do that here and
> risk
> > missing the point.
> >
> I think you're being a bit harsh, but I *do* think you're essentially
> right. Beginners will have no idea what most the that means, so... *yes*
> the type *will* need to be simplified for display purposes. (Unless, of
> course, you opt-in to full signatures.)
> Regards,
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Chris Allen
Currently working on http://haskellbook.com
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