[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: how useful are collecting lists?

On 03/12/2013 11:54 PM, Alan Manuel Gloria wrote:
There's another, the comment-only blank line, which is the "quietest"
blank line replacement:

define foo(x)
! define bar(y)
! ! y
! define baz(z)
! ! z
! whatever
! ...

Ah - good point!
In my examples, define has an implicit begin.  In this situation, I'm
unsure how to use <*, because it introduces an extra parenthesis.  Have
you run into this problem?
I've intentionally defined <* to ALWAYS create another open paren.
I think that's easier to understand, and it also makes it really helpful
in short lists.
I agree.

I haven't worried about the define-in-define case above, because the
long-and-annoying constructs that we've seen so far (as use cases)
always had some sort of list that <*...*> easily mapped to.
Of course, maybe that's a limitation of the use cases we've discussed!

Hmm. If that's a *problem*, one solution without significantly changing
the existing semantics might be to allow <*...*> after ".".  I suspect
such cases would basically just continue a list.  Here's what I have in
define foo(x) . <*
define bar(y)
! y
define baz(z)
! z
! *>
; ==> (define (foo x) (define bar(y) y) (define baz(z) z))

So... does anyone have thoughts about this?  Is this an important case?
If it is, then is this a solution?  Are people running to the exits?
Other thoughts?
Ara ara, I thought this was *already* allowed.  Basically, what you're doing is:

(define (foo x) . (
(define (bar y)
(define (baz z)

... which should work without any modifications to the spec.

This makes sense to me.