How to Create Sensible Debugging Information when Dynamically Typechecking Code Generated with camlp5 Quotations

[echinuz echinuz <echinuz@yahoo.com>]

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I have a DSL that I embedded using quotations with camlp5.  Essentially, there are a number of features that are useful in ocaml, such as file io, that I don't want to add to the language.  Using quotations allows me to add these features.  The language, by itself, can be statically type checked, but since I allow antiquotations I must type check at runtime.  Unfortunately, I'm having trouble figuring out a sensible way to add debugging information during type checking.  A typical program looks like this:

let x=... in
let prog= <:prog<
     embedded commands...
     more embedded commands...
>> in
execute prog;;

The problem with location information generated in camlp5 is that it gives the location relative to the quote.  I'm more interested in location information relative to the entire program.  One thought is to run the file through camlp5 twice and generate location information using trick similar to __LOCATION__ from pa_macro.  However, since the first pass through expands the quotations, the subsequent location information tends to be deceptive.

Is there a good way to generate this location information?  Or, more generally, is there a better way to type check the resulting program?
 
       
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