[Nickle]Array comprehension syntax

[Keith Packard]

Around 23 o'clock on Aug 4, Bart Massey wrote:

> the comprehension should just take formal names and an expression, like the
> Smalltalk block construct.

How about two forms:

 a)	{ = (i, j) i * j }

 b)	{ = (i, j) { return i * j; } }

These are trivial to distinguish, although my compose example does
take advantage of the ability to use an arbitrary function valued 
expression as a comprehension which I thought was a pretty nifty trick.

Here's what compose would look like with form a):

    poly (poly...) compose (poly f, poly g) {
        return poly func (poly args...) {
            return f (g ((poly[func_args(g)]) { = (i) args[i] } ...),
                      (poly[func_args(f)-1]) { = (i) args[func_args(g)+i] }...);
        };
    }

It's getting shorter and shorter...

Keith Packard        XFree86 Core Team        HP Cambridge Research Lab