Property definitions

nitc $ MVirtualTypeDef :: defaultinit
# A local definition of a virtual type
class MVirtualTypeDef
	super MPropDef

	redef type MPROPERTY: MVirtualTypeProp
	redef type MPROPDEF: MVirtualTypeDef

	# The bound of the virtual type
	var bound: nullable MType = null is writable

	# Is the bound fixed?
	var is_fixed = false is writable
end
src/model/model.nit:2706,1--2718,3