JSON.deprecated_singleton_attr_accessor

# File tmp/rubies/ruby-4.0.0/ext/json/lib/json/common.rb, line 203
    def deprecated_singleton_attr_accessor(*attrs)
      args = RUBY_VERSION >= "3.0" ? ", category: :deprecated" : ""
      attrs.each do |attr|
        singleton_class.class_eval <<~RUBY
          def #{attr}
            warn "JSON.#{attr} is deprecated and will be removed in json 3.0.0", uplevel: 1 #{args}
            @#{attr}
          end

          def #{attr}=(val)
            warn "JSON.#{attr}= is deprecated and will be removed in json 3.0.0", uplevel: 1 #{args}
            @#{attr} = val
          end

          def _#{attr}
            @#{attr}
          end
        RUBY
      end
    end