Pop-count: The header file tab is missing

This exercise has passed before, but today I found it doesn’t compile.
It seems that the header file, which I modified before, has not been saved.
And the tab is also missing.


I can’t reproduce this, but this exact exercise received a tiny update a couple days ago (which shouldn’t have this effect).
Could you reset the exercise by clicking on the ... and then on Revert to exercise start , and tell me if the header file is still missing?


It works. Once I clicked Revert to exercise start, it showed the header.
Thank you!

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