Add test for wunused Inlined call

Author: szymon-rd

compiler/src/dotty/tools/dotc/transform/CheckUnused.scala

@@ -59,7 +59,6 @@ class CheckUnused extends MiniPhase:
   // ========== SETUP ============
 
   override def prepareForUnit(tree: tpd.Tree)(using Context): Context =
-    println(tree)
     val data = UnusedData()
     val fresh = ctx.fresh.setProperty(_key, data)
     fresh
@@ -76,7 +75,7 @@ class CheckUnused extends MiniPhase:
     traverser.traverse(tree)
     ctx
 
-  def prepareForInlined(tree: Inlined)(using Context): Context =
+  override def prepareForInlined(tree: tpd.Inlined)(using Context): Context =
     traverser.traverse(tree.call)
     ctx
 

tests/neg-custom-args/fatal-warnings/i15503i.scala

@@ -209,7 +209,7 @@ package foo.test.i16925:
       _ = println(i) // OK
     } yield ()
 
-package foo.test.i16679:
+package foo.test.i16679a:
   object myPackage:
     trait CaseClassName[A]:
       def name: String
@@ -225,3 +225,23 @@ package foo.test.i16679:
     import myPackage.CaseClassName // OK
     case class CoolClass(i: Int) derives CaseClassName.CaseClassByStringName
     println(summon[CaseClassName[CoolClass]].name)
+
+package foo.test.i16679b:
+  object myPackage:
+    trait CaseClassName[A]:
+      def name: String
+
+    object CaseClassName:
+      import scala.deriving.Mirror
+      inline final def derived[A](using inline A: Mirror.Of[A]): CaseClassName[A] =
+        new CaseClassName[A]:
+          def name: String = A.toString
+
+  object Foo:
+    given x: myPackage.CaseClassName[secondPackage.CoolClass] = null
+
+  object secondPackage:
+    import myPackage.CaseClassName // OK
+    import Foo.x
+    case class CoolClass(i: Int)
+    println(summon[myPackage.CaseClassName[CoolClass]])