Here is a design I came up with yesterday evening (nothing done yet): for
[a, b, c, ...d]
parser builds an ast:
%SpreadArrayLiteral([a,b,c], d)
where builtin:
function SpreadArrayLiteral(lit, rest) {
let index = lit.length;
let done = false;
while (!done) {
let result = IteratorNext(rest);
done = result.done;
if (!done) lit[index+] = result.value;
}
}
Codegen will generate the code as-is, whereas PatternRewriter will
reinterpret
this as a pattern.
https://codereview.chromium.org/1125183008/
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