Merge pull request #640 from scala/backport-lts-3.3-24259

Backport "Fix scala#24207: Cleanup the type of `UnApply` trees in posttyper" to 3.3 LTS

Author: tgodzik

tests/pos/i24207.scala

@@ -0,0 +1,12 @@
+class Generator:
+  private def generateTable(table: Table) =
+    val (ownRelations, _) = calculateOwnRelations(table)
+    ownRelations
+
+  private def calculateOwnRelations(table: Table) =
+    val ownRelations = table.relations.filter(_.association.isDefined)
+    (ownRelations, Nil)
+
+case class Table(relations: Seq[TableRelation])
+case class TableRelation(association: Option[Association])
+trait Association