On 9/1/26 18:02, jobol wrote:
> What stopped me in fact is that Chez Scheme can't test that a library
> is available or not in cond-expand
> (https://github.com/cisco/ChezScheme/issues/91).

Looking at the standard operators, the only one that is not in the R6RS
is "unbox."

Guile ships SRFI 111, and chez-srfi[1] ships one that is a wrapper of
the Chez interface. So I think the sample implementation can import SRFI
111, with a note to remove it if the target implementation doesn't
support it.

 > thank you for that and for your help

You're welcome!

[1]: https://github.com/arcfide/chez-srfi

-- Peter McGoron