Property definitions

nitc $ MPropertyCallVisitor :: defaultinit
# Visitor looking for calls to a `MProperty` (new T).
#
# See `CallCmd`.
private class MPropertyCallVisitor
	super Visitor

	var calls = new HashSet[MProperty]
	redef fun visit(node)
	do
		node.visit_all(self)
		if not node isa ASendExpr then return
		calls.add node.callsite.as(not null).mproperty
	end
end
src/doc/commands/commands_usage.nit:191,1--204,3