On 17 avr. 2014, at 22:24, Edward Kmett <ekmett@gmail.com> wrote:

* (|) is already stolen for syntax, so the pairing, while a powerful mnemonic, can't be used at all here.

* (#) collides with the use of (#) in MagicHash, so you get uncomfortable cases where you need to throw in a space.

* (&) can be read off as "and then". (#) has no such obvious reading and is just more line noise someone has to learn.

Thanks for the explanation. Maybe some Wiki page with a list of syntax and fixity proposals, explanations, comments, and votes could be made for this?

One more idea: how about '>-' for 'flip ($)' and '-<' for '$', by analogy with '>>=' and '=<<'?

y = 3 >- \x -> x * x -- y == 9

Alexey.