> and redefines the SVE of ${=x.y} to be
>
> function () { return arguments.length ? (x.y = arguments[0]) : x.y }
>
> so instead of passing substitution values, for read-only substitutions
> (those without the = modifier) you get a thunk, and for writable
> substitutions you get a function that returns the value when called
> with 0 arguments or assigns the first parameter if passed one.
Ah, nice. I would have handed in an array of substitutions, let the handler
change an array element and then performed an assignment such as
x.y = substs[0].
The above solution is better, because the desugaring is local.
Axel
--
Dr. Axel Rauschmayer
a...@rauschma.de
twitter.com/rauschma
home: rauschma.de
blog: 2ality.com
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