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I'm trying to understand the exact behavior of thread environments in
Lua 5.1. (I am familiar with the changes introduced in 5.2.)

>From the Lua 5.1 ref manual, I would expect the following to print
false, however it prints true:

flag = true
local newG = { flag = false}
local coroutine, print,setfenv = coroutine,print,setfenv
    setfenv(0, newG)

Can someone explain? And what could be written in place of `print(flag)`
that would rely on newG for the lookup? getfenv(0) does return newG,
but any functions or new coroutine calls I insert there still seem to be
using the original _G.

Jim Pryor