class RBS::Definition

def sub(s)
  definition = self.class.new(type_name: type_name, self_type: _ = self_type.sub(s), ancestors: ancestors, entry: entry)
  definition.methods.merge!(methods.transform_values {|method| method.sub(s) })
  definition.instance_variables.merge!(instance_variables.transform_values {|v| v.sub(s) })
  definition.class_variables.merge!(class_variables.transform_values {|v| v.sub(s) })
  definition
end