René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"PyRepl tests failing with Emscripten 6.0.2","articleBody":"# Bug report\n\n### Bug description:\n\nReported via @encukou in [this comment](https://github.com/python/cpython/issues/145177#issuecomment-4912789806)\n\nThe Emscripten buildbot is currently failing the PyRepl test. If I run the browser test locally, I get the following error in the JS console:\n\n`Unhandled Promise Rejection: TypeError: Module.PyUnstable_DumpTraceback is not a function. (In 'Module.PyUnstable_DumpTraceback(2, Module._PyGILState_GetThisThreadState())', 'Module.PyUnstable_DumpTraceback' is undefined)`\n\nIf I revert to emscripten 6.0.0, the PyRepl page loads without a problem.\n\n/cc @hoodmane \n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nOther\n\n\u003c!-- gh-linked-prs -->\n### Linked PRs\n* gh-153698\n* gh-153701\n* gh-153727\n* gh-153728\n\u003c!-- /gh-linked-prs -->\n","author":{"url":"https://github.com/freakboy3742","@type":"Person","name":"freakboy3742"},"datePublished":"2026-07-08T09:07:45Z","url":"https://github.com/python/cpython/issues/153313"}