[pure-lang-users] precedences

[Albert G. <Dr....@t-...>]

Eddie Rucker wrote:
> With that precedence, how can I write something like [1=>"a",2=>"b"] without a syntax error?

Oops, you're right, of course you want to bind it stronger than ',', but
weaker than the logical operators.

Also, I'm wondering whether '$' has the right precedence. I made it
weaker than ',' so that you can write something like foo $ x,y,z. But
now I think that this is wrong, it should be:

infixr 0 , ;
infix  1 => ;
infixr 1 $ ;

Then you'll have to write foo (x,y,z) (which looks nicer anyway), but
you can also use $ inside list elements without parenthesizing it.

Any objections?

Also, on second thought I'm willing to add => to the prelude after all.
If two completely unrelated modules use this, then others may follow
suit, and it's going to be a mess if we need to change the precedence again.

Albert

-- 
Dr. Albert Gr"af
Dept. of Music-Informatics, University of Mainz, Germany
Email:  Dr....@t-..., ag...@mu...
WWW:    http://www.musikinformatik.uni-mainz.de/ag