System.ReferenceType - Manhunter07/MFL GitHub Wiki
Declaration
const ReferenceType = 1
Description
The ReferenceType constant in the System package represents the type code for referenced variables, functions and types. It is returned when retrieving the type of such references using the TypeOf function.
Other than the name might suggest, it is not a type but a constant. If you want to restrict function parameters to accept references only, use System.Reference instead.