[Haskell-cafe] [] == []

[Brandon Allbery]

On Tue, Mar 10, 2015 at 9:18 AM, Rustom Mody <rustompmody at gmail.com> wrote:

> On Tue, Mar 10, 2015 at 2:03 PM, Brandon Allbery <allbery.b at gmail.com>
> wrote:
>
>> On Mon, Mar 9, 2015 at 10:33 PM, Rustom Mody <rustompmody at gmail.com>
>> wrote:
>>
>>> 1. Which instance of == is being used?
>>> 2. Is there some option controlling this behavior?
>>>
>>
>> The instance being used is (), and it's controlled by
>> -XExtendedDefaultRules.
>>
>>
>> https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/interactive-evaluation.html#extended-default-rules
>>
>
> Thats what I first thought
> Tried starting ghci with  -XNoExtendedDefaultRules
> but it does not turn it off
>

Looks like -X only affects compiler flags:

    Prelude> :showi language
    base language is: Haskell2010
    with the following modifiers:
      -XNoMonomorphismRestriction
      -XNoDatatypeContexts
      -XNondecreasingIndentation
      -XExtendedDefaultRules

Probably need to use :seti inside of ghci, or in a .ghci / ghci.ini file.

-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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