[Haskell-cafe] ANNOUNCE slot-lambda

[Tom Ellis]

On Tue, Apr 08, 2014 at 03:58:30AM +0700, Kim-Ee Yeoh wrote:
> On Mon, Apr 7, 2014 at 11:02 PM, ducis <ducis_cn at 126.com> wrote:
> 
> > It lets your write lambdas with 'slots' without inventing names for the
> > parameters.
> >
> > [s| ı + ı |]  =  \x y -> x+y
> >
> >
> I have no background in this 'slot lambda' and a search reveals this
> package as the only hit.
> 
> Which may explain why I find the example given confusing. Why would [s| 1+1
> |] not be equivalent to \x->x+x ?

Because each slot stands for a new variable.