On Oct 10, 2005, at 2:32 PM, yoann padioleau wrote:

> I am making a program analysis tool  and in my AST I had previously  
> tokens represented as strings,
> but now I want also to associate the line numbers of those strings.

I like to suggest a different technique that does not require to change  
the representation of all branches in an AST. You can find it in an  
earlier posting here:

http://caml.inria.fr/pub/ml-archives/caml-list/2003/09/ 
f81c8063ed4878e06f1ddd8010256050.en.html

The posting is part of a thread that also discusses some disadvantages.

-- Christian