[Haskell-cafe] Language complexity & beginners (Was: New type of ($) operator in GHC 8.0 is problematic)

Takenobu Tani takenobu.hs at gmail.com
Mon Feb 8 10:08:55 UTC 2016

Hi Richard and devs,

What a wonderful (#11549) !
This is a beautiful solution for beginners/newcomers.
Beginners will not confuse and they can gradually go ahead.

I extremely appreciate that you are continuously improving the ghc for us.

Thank you very much,

2016-02-07 0:17 GMT+09:00 Richard Eisenberg <eir at cis.upenn.edu>:

> I have made a ticket #11549 (https://ghc.haskell.org/trac/ghc/ticket/11549)
> requesting a -fshow-runtime-rep flag (recalling that the name levity will
> soon be outdated) as described in this thread. I will make sure this gets
> in for the release of 8.0.
> Other points:
> - You're quite right that (.) could be generalized. But I'll wait for
> someone to really want this.
> - I don't have a non-contrived example of the use of ($) with unlifted
> types. It's quite possible that when adding the dirty runST hack, it was
> observed that an unlifted type would be OK. At that point, the type of ($)
> didn't need to become so elaborate. And now we're just trying not to change
> old (but perhaps unrequested) behavior.
> - For the record, this debate is entirely unrelated to the runST
> impredicativity hack. (Except, as noted above, perhaps in history.) That
> hack remains, basically unchanged.
> - On Feb 6, 2016, at 9:55 AM, Roman Cheplyaka <roma at ro-che.info> wrote:
> >
> > I would call this a simplification rather than a lie.
> This is a very convincing argument.
> - Thanks, also, for the voice of support. What I love about the Haskell
> community is that we can have an impassioned debate full of strong
> opinions, and it all very rarely devolves into a proper flame war. All the
> posts I've seen in this thread have been constructive and helpful. Thanks.
> Richard
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