How to get line#?

Hi guys,

I had transformed my CST to AST.

but for most situations, I did not keep Tokens in the AST, for example,

...
exp =
  {l_value} l_value
| {eq} [lhs]:exp [rhs]:exp
| {lt} [lhs]:exp [rhs]:exp
| {gt} [lhs]:exp [rhs]:exp
...

however, when traversing the AST by extends the DepthFirstAdapter, I can not get the line# of an exp.

How to solve it?

--
Dehua (Andy) Zhang
Sable Research Group, McGill University
Montréal, Québec, Canada
http://www.cs.mcgill.ca/~dzhang25

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