[Bug]: Emscripten ci builds fail as of 10th November when running xeus-cpp C++ tests.

[mcbarton]

Description of bug

As of the 10th November the Emscripten ci fails. See here for the first nightly build which failed

https://github.com/compiler-research/CppInterOp/actions/runs/19245558989

Its not immediately obvious as to what is causing the failures. The only change which I am aware of which happened between the 9th (when the ci passed) and 10th November (when it began failing) is this commit got made to xeus-cpps main compiler-research/xeus-cpp@5860e95 . This commit however doesn't appear to be the source of the error, since reverting it doesn't allow the Emscripten ci to pass. Since the 10th November the Emscripten ci for the llvm 21 PR doesn't pass either for the xeus-cpp tests.

[mcbarton]

Solved and opened up a PR here reverting xeus-cpps latest commit here compiler-research/xeus-cpp#411. I made the silly mistake of forgetting there is a big difference between git reset --soft HEAD~ and git reset --hard HEAD~ when undoing the last commit of a repo, when I previously discounted it as the source of the problem.

[mcbarton]

Reopening as the broken Emscripten ci and deployment will not be fixed until that xeus-cpp PR is in.