ref
fun LanguageFrontend.ref(name: CharSequence, type: Type = newUnknownType(), init: DeclaredReferenceExpression.() -> Unit? = null): DeclaredReferenceExpression
Creates a new DeclaredReferenceExpression in the Fluent Node DSL and invokes ArgumentHolder.addArgument of the nearest enclosing Holder, but only if it is an ArgumentHolder.