Setting 'outer' globals from within nested fenvs?

[Mark Sibly <blitzman@...>]

Hi,

Lua newbie here...

I've just got the hang of using __index to access variables declared in 
an 'outer' scope/table, but I can't work out how to modify them. 
Instead, a new 'inner' variable always gets created.

Is there any way to do this?

Ideally, if I've got code like...

HitPoints=HitPoints-10

...and HitPoints exists in an 'outer' environment, the outer version 
should be modified. If there is no outer version, a new HitPoints 
should be created in the inner env. Currently, using __index allows the 
code to 'read' the outer HitPoints, but not write it.

Sorry for the lack of sample code, but it's a c/lua hybrid thingy, 
where c code sets up a new inner env using fsetenv, chaining it to an 
outer env using __index. I have a feeling I'll be able to do a lot of 
the C stuff in Lua eventually once I get bit more pratice though!

Bye,
Mark