garbage collection and setfenv

["Matthew Armstrong" <turkeypotpie@...>]

So let's say I say:

function tryThis()
    myVar = { foo="baz" }
end

local env = {}
setfenv(tryThis, env)
tryThis()

My question is: when does myVar get collected?  With my current testing, it seems that myVar never gets collected.  If so, how do I "convince" it to be collected?