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I discovered that magnolia compiled by 3.3.3 (or 3.3.4) causes

scala/scala3#22499

which is due to a tree with NoSpan. I believe it is the Ident in this unchecked annotation:

https://github.com/softwaremill/magnolia/blob/scala3/core/src/main/scala/magnolia1/impl.scala#L120

I have verified that a couple of the projects erroring at the ticket (which depend directly or indirectly on magnolia) work after just publishing locally with 3.3.5. (That is, a project using 3.7 consuming magnolia built by 3.3.5.)

Sorry I haven't yet nailed down what the fix is on 3.3.5.

The symptom is that on 3.7 -Wunused:imports uses the span but must code defensively. I don't know yet whether it's strictly a bug that a tree has a position that has no span. The defensive fix is at

scala/scala3#22504

@adamw adamw merged commit 5be4e9a into softwaremill:scala3 Feb 25, 2025
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adamw commented Feb 25, 2025

Thanks

@som-snytt som-snytt deleted the upgrade/3.3.5 branch February 25, 2025 12:34
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2 participants