[racket] Writing algebraic maths expressions

That just made me think of this:
https://github.com/AlexKnauth/sweet-exp-utils/blob/master/sweet-exp-utils/kw-let.rkt
Which lets you write:
kw-let #:a 1 #:b 2
    {a + b}
Or:
kw-let
    #:a 1
    #:b 2
    {a + b}
Instead of having let, group, and the first id-val pair all be on different lines.


On Mar 7, 2015, at 8:05 AM, Alexander D. Knauth <alexander at knauth.org> wrote:

> 
> On Mar 7, 2015, at 7:11 AM, Norman Gray <norman at astro.gla.ac.uk> wrote:
> 
>> Another possibility is Sweet expressions, as described at <http://pkg-build.racket-lang.org/doc/sweet/index.html> and <http://readable.sourceforge.net>.  That feels plausible, but (i) the port doesn't seem complete, since when I try:
>> 
>> #lang sweet-exp racket/base
>> 
>> let
>> \\
>>   a 1
>> *(a a)
> 
>> (see <http://sourceforge.net/p/readable/wiki/Scheme-tutorial/>, at 'Grouping and Splitting'), I get 'let: bad syntax (not an identifier and expression for a binding) in: |\\|’.  
> 
> For this, sweet-exp uses `group` instead of `\\`.
> 
> #lang sweet-exp racket
> let
>  group
>    a 1
>    b 2
>  {a + b}
> 
> 
> 
> ____________________
>  Racket Users list:
>  http://lists.racket-lang.org/users