attempt to make sorting function static: error: /table.scala:87: could not find implicit value for parameter mapper: shapeless.ops.hlist.Mapper[TableView.this.on.transformer.type,xx.Out] - [error]       val sorters = x map on.transformer
adding a Mapper does not work: table.scala:83: not found: value on - [error]                                            mappr: Mapper[on.transformer.type,Out]) {