Enabling TypeHoles by default

[migmit]

Agreed. Having it in 7.8 would be very nice, and yes, I don't see how it can break anything.

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> 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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