class Rack::Logger

Sets up rack.logger to write to rack.errors stream

def call(env) 

def call(env)
  logger = ::Logger.new(env[RACK_ERRORS])
  logger.level = @level
  env[RACK_LOGGER] = logger
  @app.call(env)
end

def initialize(app, level = ::Logger::INFO) 

def initialize(app, level = ::Logger::INFO)
  @app, @level = app, level
end