Seems OK by me.
On Fri, Aug 17, 2012 at 8:47 PM, David A. Wheeler <dwhee...@dwheeler.com> wrote:
> After fiddling, I'm thinking we should handle length 0 curly-infix
> expressions specially, CHANGING the semantics of {} and f{} specifically.
> This isn't a big change, it's an edge case, but I'd like to get it right.
> Let's talk!
>
> Currently, the empty curly-infix-expression {} means (nfx). That's
> defensible, but it is weird, and it's subtly inconsistent with the idea that
> {} is basically a slightly different list notation. After all, () IS an
> empty list. But more importantly, this means that the neoteric-expression
> f{} maps to (f (nfx)), not to (f).
>
> That interpretation of f{} is unlikely to be what the user intended. I think
> it's quite likely that since people will use f{...} for an infix list, they
> will occasionally write f{} expecting it to map to (f). While we can't
> prevent all mistakes (!), if we can define the semantics constructs have
> their "expected" meaning that'd be a good thing. These meanings of {} and
> f{} are very unlikely to be the user's intent. And if the user really means
> that, there are already clearer ways to write that: (nfx) or nfx() for the
> first case, and (f (nfx)) or f(nfx()) for the second case.
>
> So I propose the following semantic changes:
> * Curly-infix: If the length is 0, return () not (nfx).
> * Neoteric-expressions: Given e{...}, if the curly expression {} returns (),
> map it to (e).
>
> --- David A. Wheeler
>
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