class RuboCop::Cop::VariableForce::Reference

but it can be considered used implicitly by the `super` or `binding`.
In these cases, the variable `foo` is not explicitly referenced,

end
do_something(binding)
def some_method(foo)

Another case is `binding`:

end
super
def some_method(foo)

There's an implicit variable reference by the zero-arity `super`:

def explicit?
  ![ZERO_ARITY_SUPER_TYPE, SEND_TYPE].include?(@node.type)
end