lfs module to enumerate service definition json files does not work on multiple instance of aws object

[umegaya]

as title. reported to fail with following error

./lua-aws/services/base.lua:19: attempt to index a userdata value

in the situation like below.

local aws1 = AWS.new({ ..., region = 'us-west-1' })
local aws2 = AWS.new({ ..., region = 'us-east-1' }) -- fails

[umegaya]

@zhezi7 this error happens when you run test/sqs.lua or you wrote your own code to create SQS? if later, could you show me the code?