Unused implicit conversion imports are not detected under certain circumstances #22976
Description
Compiler version
3.6.4
Minimized code
package testing
object Syntax {
implicit def conversion(a: DummyClass): DummyClass = new DummyClass
}
class DummyClass
import Syntax.*
case class CaseClass(field: Boolean)Note: I could not reproduce this in the REPL
Output
Expectation
The above code should return the following warning:
[warn] -- [E198] Test2.scala:9:14
[warn] 9 |import Syntax.*
[warn] | ^
[warn] | unused import
[warn] one warning found
As far as I can tell, this warning behaves correctly for:
- trait
- class
- abstract class
- object
- def
The warning behaves incorrectly for:
- case class
- case object (even trivial ones)
Note also this occurs even if the implicit conversion is completely irrelevant to any types involved, as in the above example