Getting the variable number of a lexical local variable

[Charles Greathouse <charles.greathouse@case.edu>]

I'm trying to get the variable number of a lexical variable, but I
can't seem to figure out how to do that.

If I have a function with a V in the prototype, like a custom for
loop, how do I know which variable was used?

In my case, I would like to be able to distinguish between calls to
sumformal(x=1, N, x^2 * y)
and
sumformal(y=1, N, x^2 * y)
.

Charles Greathouse
Analyst/Programmer
Case Western Reserve University