Why is srcref of length 6 and not 4 ?
I am using this to massage the output of "parse" into a data frame to represent it as a tree (see http://addictedtor.free.fr/misc/sidekick.png)
You might also want to take a look at http://github.com/hadley/eval.with.details/blob/master/R/parse.r where I'm trying to do something similar for a different purpose. Hadley