Support for the Ruby 2.4 series has ended. See here for reference.
Object
Returns a hash, that will be turned into a JSON
object and represent this object.
# File json/lib/json/add/struct.rb, line 16 def as_json(*) klass = self.class.name klass.to_s.empty? and raise JSON::JSONError, "Only named structs are supported!" { JSON.create_id => klass, 'v' => values, } end