Hello Mo,

On 5/28/07, Mo DeJong <mo@[...].com>  wrote:
> 
>   You can write a compiler that assumes that a
>  proc does not deal with linked variables,
>  but it is trivial to create a test case that breaks this optimization.


Yes, if we do nothing actively to deal with upvars.
But I was thinking about intercepting those accesses at runtime (see my
answer to Donal's).

P.S.
>  If you are looking for test cases for compiler related Tcl issues like
>  this, I suggest you have a look at the tjcruntime
>  package in the tcljava CVS:
> 
>  http://tcljava.cvs.sourceforge.net/tcljava/tjcruntime/varcache/


Thanks much for the pointer. I'd also appreciate any high-level description
of the bytecode VM. Do you have anything like this ?

-Alex