5.2 require populates package.loaded with nil

[<AllanPfalzgraf@...>]

I have a single-function module build with Visual Studio 2010 that
apparently loads but its function cannot be accessed because the entries
in package.loaded are nil.  Below print(type(cb)) returns nil while all
other k's in package.loaded return table.

Obviously, I am doing something wrong?

Here is a link to the code for the module:
http://codepad.org/Yz7jCAHH

C:\Documents and Settings\e0058060\My
Documents\Software\Lua\lua-5.2.0-beta\lua52\Debug>lua
Lua 5.2.0 (beta)  Copyright (C) 1994-2011 Lua.org, PUC-Rio
> require("cb")
> for k,v in pairs(package.loaded) do print(k,v) end
string  table: 003588E8
debug   table: 00358378
package table: 003569F8
_G      table: 00354E80
io      table: 00357868
os      table: 00357528
table   table: 00357578
math    table: 00359780
cb      table: 0035C9A8
coroutine       table: 003571F8
bit32   table: 003591E0
> for k,v in pairs(package.loaded.cb) do print(k,v) end
write   function: 00381390
> print(type(os))
table
> print(type(cb))
nil
> print(type(string))
table
>


 

	Allan Pfalzgraf 
	EATON

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	Milwaukee, WI 53216 
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	AllanPfalzgraf@eaton.com 
	www.Eaton.com <http://www.eaton.com/>  <http://www.eaton.com/>