def load_constant(constant)
      return if loaded?(constant)

      registry.load(constant)

      return unless registry.include?(constant)

      apply(constant)
    end
def load_constant(constant)
      return if loaded?(constant)

      registry.load(constant)

      return unless registry.include?(constant)

      apply(constant)
    end
Tries to load the definitions for the given constant.

 @param [String] constant