when-defined-reentry-crash.html

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This WPT test may be referenced by the following Test IDs:
- /custom-elements/when-defined-reentry-crash.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Check for crashes when a whenDefined promise resolving re-entries</title>

<meta name="author" href="mailto:xiaochengh@chromium.org">

<link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-elements-api">

<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1366813">

<script>

class CustomElement extends HTMLElement {}

Object.prototype.__defineGetter__("then", main);

let depth = 0;

function main() {

  if (depth > 1) return;

  ++depth;

  customElements.whenDefined("custom-a"); // Causes re-entry of main()

  try { customElements.define("custom-a", CustomElement) } catch (e) {}

  customElements.whenDefined("custom-b");

  --depth;

main();

</script>

Test passes if it does not crash.