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var max_nesting_level = 8;
self.addEventListener('message', function(event) {
var level = event.data;
if (level < max_nesting_level)
dispatchEvent(new MessageEvent('message', { data: level + 1 }));
throw Error('error at level ' + level);
});
self.addEventListener('activate', function(event) {
dispatchEvent(new MessageEvent('message', { data: 1 }));
});