Ruby on rails安装后去掉DL is deprecated,please use Fiddle警告信息的方法【测试可用】（rubysparks）全程干货

begin
require ‘fiddle’ unless Object.const_defined?(:Fiddle)
rescue LoadError
end

#warn “DL is deprecated, please use Fiddle”

module DL
# Returns true if DL is using Fiddle, the libffi wrapper.
def self.fiddle?
Object.const_defined?(:Fiddle)
end
end