1/1: Building IfErr (IfErr.idr)IfErr.idr:15:10--17:1:While processing right hand side of test at IfErr.idr:15:1--17:1:Can't find an implementation for Eq FooIfErr.idr:23:9--25:1:While processing right hand side of test2 at IfErr.idr:23:1--25:1:Can't find an implementation for Show Foo