let binding with c

Hi Bigloo team,

We observe an issue with the latest bigloo-4.3  (it was already present in the previous  beta)
I have a procedure which has a let* . In this let*, a variable is binded to a C function, something like:
(data        (pragma::bstring "string_to_bstring_len( $1, $2 )" [....])
Then this variable is used in some of the next bindings, and also in the body of the let*.
But at one stage, (in the body if I remember) ; its content is wrong, corrupted.

As a workaround, we needed to change this implementation:
- create a global variable (define data "") ; split the let* into 2 let* and add  a  (set! ...) in between to replace the previous binding.
... something a little bit dirty.
I 'm not sure I can create a small test case to observe this issue; but maybe this description is enough ?
Anyway, If you can find a fix  so that  we can remove our workaround, it will be really appreciated.
Thanks, regards,
Michel.