> Hmmm, isn't there a way to reference variables using a string form
> of its name [no book handy to check, but something like var("foo")]?
> If so, then getting rid of the hidden variables might be hard indeed.

The function is named "variable". Given the variable name, this function
returns the value of the variable. If there is no variable with the given
name, then the "variable" function fails.

This is an excellent point. It points out how an unreferenced co-expression
variable could be accessed .although I still know of no technique for
assigning a new value to these variables. I doubt if there is much use of
this feature, but the fact that this is part of the standard argues strongly
against changing the way co-expressions copy dynamic variables.



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