Regression test for #16076

Author: odersky

tests/pos/i16076.scala

@@ -0,0 +1,9 @@
+trait Column[V]
+trait ColumnPath
+
+trait ColumnFactory[V, C <: Column[V]]:
+  def apply(columnPath: ColumnPath): C
+
+object ColumnFactory:
+  private def apply[V, C <: Column[V]](f: String => C): ColumnFactory[V, C] =
+    columnPath => f(columnPath.toString())