module Faraday::DependencyLoader

def dependency(lib = nil)
  lib ? require(lib) : yield
rescue LoadError, NameError => e
  self.load_error = e
end

def inherited(subclass)
  super
  subclass.send(:load_error=, load_error)
end

def loaded?
  load_error.nil?
end

def new(*)
?
ing dependency for #{self}: #{load_error.message}"