Empty.ceylon: corrected span param that was contravariant (weird that it wasn't caught by the typechecker)
Empty.ceylon: corrected span param that was contravariant (weird that it wasn't caught by the typechecker)

gijsleussink/ceylon,gijsleussink/ceylon,gijsleussink/ceylon,gijsleussink/ceylon,gijsleussink/ceylon