default fixity for `quotRem`, `divMod` ??

[Isaac Dupree]

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Bulat Ziganshin wrote:
> Hello Isaac,
> 
> Monday, June 18, 2007, 9:20:29 PM, you wrote:
> 
>> I was just bitten in ghci by `divMod` being the default infixl 9 instead
>> of the same as `div` and `mod`.
> 
> one of my hard-to-find bugs was exactly in this area: i wrote
> something like  x `div` y+1  instead of  x `div` (y+1)
> 
> so, based on practical experience, i have opposite proposal: give to
> all `op` lowest precedence (a bit higher than of '$') because it
> complies to its visual effect

I wonder how much code this would break.  Maybe we could have a warning
for anything that relies on the default fixity anyway (for things like
x `div` y+1  , that don't give a type error anyway).  And it would be
nice if even e.g. `div` had the same precedence as all other `op`s in
existence -- but I'm pretty sure that would break a bunch of code.

Isaac
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