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var samples = [
"[...a]",
"[...[1]]",
"[1, ...a, 2]",
"[1, ...[2, 3], 4]",
"[...[1], , ]",
"[1, , ...[2]]",
"[, 1, ...[2], ...[3], , 4, 5, , ]"
];
for (var sample of samples) {
var source = "function f() {\n return " + sample + ";\n}";
eval(source);
assertEq(f.toString(), source);
}