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var registry = new FinalizationRegistry(x => {
if (target1 === null) {
return;
}
target1 = null;
gc();
print("targets:", [...x]); // consume
});
var target1 = {};
registry.register(target1, "target1");
var target2 = {};
registry.register(target2, "target2");
target2 = null;
gc();