LuaJIT 2.0.3 -- Copyright (C) 2005-2015 Mike Pall. http://luajit.org/ JIT: ON CMOV SSE2 SSE3 SSE4.1 fold cse dce fwd dse narrow loop abc sink fuse > loadstring('io.open()')() [string "io.open()"]:1: bad argument #1 to 'open' (string expected, got no value) <!-- function name is OK stack traceback: [C]: in function 'open' [string "io.open()"]:1: in main chunk stdin:1: in main chunk [C]: at 0x00404240 > loadstring('return io.open()')() stdin:1: bad argument #1 to '?' (string expected, got no value) <!-- function name is not detected properly stack traceback: [builtin#109]: at 0x0044a160 stdin:1: in main chunk [C]: at 0x00404240 v2.0.3-57-gdfa173b -- WBR, Roman Tsisyk <roman@xxxxxxxxxxxxx> http://tarantool.org/ - an efficient in-memory data store and a Lua application server http://try.tarantool.org/ - try your Lua code **online**