Does this not tell us that the function is not only not imported, but not even defined

The error message from the OP tells us it wasn't defined.

Neither the error message or the fact that using the full qualified name works tells us whether it was imported or not.

But it does strongly suggest the problem is that it wasn't imported, yes. The two most likely causes of that is buggy/missing exporting logic, or modules that (directly or indirectly) use each other.

In reply to Re^3: use statement seemingly ignored by ikegami
in thread use statement seemingly ignored by wolfie7873

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