Enabling TypeHoles by default

[Carter Schonwald]

+1. Will any freevariable be considered a type hole? Or just _blah and _ ?


On Mon, Jan 13, 2014 at 2:07 PM, Erik Hesselink <hesselink at gmail.com> wrote:

> I think that's a good idea. It was also suggested in a reddit thread
> [0] a year ago, and it doesn't seem like that thread has any arguments
> against it.
>
> Erik
>
> [0]
> http://www.reddit.com/r/haskell/comments/10u7xr/ghc_head_now_features_agdalike_holes/c6gvy0r
>
> On Mon, Jan 13, 2014 at 8:03 PM, migmit <migmit at gmail.com> wrote:
> > Agreed. Having it in 7.8 would be very nice, and yes, I don't see how it
> can
> > break anything.
> >
> > Отправлено с iPad
> >
> > 13 янв. 2014 г., в 22:54, Edward Kmett <ekmett at gmail.com> написал(а):
> >
> > I have to admit, I rather like this suggestion.
> >
> > -Edward
> >
> >
> > On Mon, Jan 13, 2014 at 1:42 PM, Krzysztof Gogolewski
> > <krz.gogolewski at gmail.com> wrote:
> >>
> >> Hello,
> >>
> >> As discussed on ghc-devs, I propose to enable -XTypeHoles in GHC by
> >> default. Rationale:
> >>
> >> (1) This way holes are far easier to use; just entering "_" allows to
> >> check type of a subexpression, no need of adding "-XTypeHoles".
> >>
> >> (2) This affects error messages only; i.e. the set of programs that
> >> compile stays the same - Haskell 2010. The only exception is that if
> you use
> >> -fdefer-type-errors, then a program with a hole compiles, but this seems
> >> fine with philosophy of -fdefer-type-errors.
> >>
> >> If so: would you like it to be in 7.8 or wait a cycle? My preference is
> >> 7.8, two people (John and Richard) suggested 7.10.
> >>
> >> -KG
> >>
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> >>
> >
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