1 ../lib/pipeline.nit:50,10--35: Warning: Expression is already a Collection[Object] since it is a Collection[E].
2 ../lib/pipeline.nit:67,10--35: Warning: Expression is already a Collection[Object] since it is a Collection[E].
3 ../lib/pipeline.nit:165,17--36: Warning: Expression is already a Object since it is a E.
4 ../lib/pipeline.nit:167,40--61: Warning: Expression is already a Object since it is a E.