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chromium/third_party/blink/web_tests/fast/dom/script-module-with-export-leak.html 

<!doctype HTML>
<script type="module">
export var foo = 42;
</script>
<script>
if (window.testRunner)
  testRunner.dumpAsText();
</script>
<p>This test shouldn't leak any document when run w/ --enable-leak-detection</p>