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<!DOCTYPE html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JS Bin</title>
<script>
window.onunhandledrejection = e => {
  console.log(e.reason);
  return false;
};
  
console.clear();
const rs = new ReadableStream({
  start(controller) {
    controller.close();
  }
});
const reader = rs.getReader();
reader.releaseLock();
</script>
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