Using one module's functions from another

[Reuben Thomas <rrt@...>]

Another basic 5.1 module question:

Within:

module "a"

how do I use functions from other modules, e.g. string.find &c.? I can 
do

local string = string
module "a"

but this is rather ugly, especially for functions in the top level, 
which I then have to treat one at a time:

local require, print = require, print

Also, what if I want to use functions from a module required by the 
current one, e.g.

local require = require
module "a"
require "b"
b.foo()

? I don't see how I can do a "local b = b" here, as "b" isn't defined 
before I do 'module "a"' in general.

I guess I don't really understand the way that module modifies the 
environment yet...

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