Why does rustc warning 'Failed to garbage collect finalized incremental compilation session directory'

This will occur when I compile any project on ubuntu running on Termux Android

Although it seems harmless, but it may decrease the compiling speed or do something else unknown. How can I resolve it?

Sounds weird. I would just delete the target directory and rebuild.

I have tried that many times, the first time building the project after deleting the target directory the warning doesn't appear, but since second the warning will appear again :slightly_frowning_face: