Alan Manuel Gloria:
> Now, my instinct is that option2 requires another semantic symbol with
> a different name. Let's call it ENLIST. And we want an ENLIST-inline
> rule that is different from SPLICE-inline, but which is ultimately
> compatible with ENLIST-at-the-start (in the same manner that
> SPLICE-inline and SPLICE-at-the-start are compatible in the sense that
> vim's shift-J transform them syntactically from one to the other but
> retain the semantic meaning).
>
> Provisionally let's use ~ for ENLIST (which is sadly used in Arc, but
> I suppose we can say "tilde whitespace", since Arc uses ~ as a prefix
> on symbols meaning "negate the function of this symbol")
Reasonable enough. Other punctuation we might use for some purpose other than
~ includes !, @, and ^. A combo could be used too, e.g., ~~ or !! or ^^.
I'm getting a little concerned about the symbol \. While I think it LOOKS
nice, it has an established meaning in Common Lisp (and I think other
implementations too).
> ENLIST-at-the-start:
>
> let
> ..~ var1 val1
> ....var2 val2
> ..content
>
> ENLIST-inline (!!)
>
> ; (you should probably view this in a fixed-width font)
> let ~ var1 val1
> ......var2 val2
> ..content
>
> ...so how do we spec it? I dunno. Probably need to make head accept
> a declarative input too, hahaha.
*That's* interesting.
You could also do:
let ~ var1(val1) var2(val2)
..content
To be fair, for the simple version, the ~ isn't much more complex than:
let (var1(val1) var2(val2))
..content
The real advantage of this ENLIST (~) operator is when val1 or val2 are more
complex, so you'd like to be able to indent further (since parens disable
indentation processing).
> > That said, I'm simply floating the idea at this point. Both
> > option#1 ("initial-\-ignored") and option#2 ("initial-\-creates-new list")
> > seem plausible enough.
--- David A. Wheeler
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