From: Roger Pack <rogerpack2005@...>
Date: 2008-07-09T13:56:42+09:00
Subject: Re: Faking named parameters and enforcing required params


> My question is does anybody know the C code for 'adding' a variable to 
> the scope above the current?
> something like
> 
> 
>   scope->prev->local_vars.push(name, object);
> 
> Thanks!
> -R

It appears impossible [from casual glancing at the code] to add an 
arbitrary local variable during runtime.  This because it uses a 'parse 
then run' style execution.
I.e.
a = 3
b
is first translated into
ASSIGN(a, 3)
CALL(b)

and then run consecutively.
And
a = 2
a
is translated into
ASSIGN(a, 2)
VAR_VALUE(a) since a is already defined.  Then run.

So it appears that currently the only way to arbitrarily add a local 
variable would be to hack the parse tree itself.

Guess I'll file a requested feature of binding.set_local_variable :)
-R
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