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Matias Guijarro wrote:

Lua 5.1  Copyright (C) 1994-2006 Lua.org, PUC-Rio
 > setmetatable({}, { __tostring = function (t) print("hello") end })
 > print({})
table: 0x8091e30


AFAIK one can't set metatable to table type, only to individual tables:

  local t1 = {}
  setmetatable(t1, { __tostring = function (t) return "hello" end })
  print(t1)

--
Shmuel