Re: stumped by scm_car/scm_cdr

[Marius Vollmer]

Han-Wen Nienhuys <address@hidden> writes:

> I tried setting a breakpoint on this function, but if I do, the run
> completes as expected normally.

One more idea: it might be that you (harmlessly) used SCM_CAR or
SCM_CDR on a non-pair but scm_car/scm_cdr are now complaining about
this by throwing an error.  That error might happen in a context where
throwing does not work, or might lead to endless recursion, or some
other anomaly.  Try replacing the call to scm_wrong_type_arg_msg in
scm_car and scm_cdr with a simple abort.

(This does not explain why the bug disappears when debugging it, so it
is an unlikely scenario...  Typical case of a Heisenbug...)