[Chicken-users] eval of (0) crashes app

[Heinrich Taube]

Hi in csi when i eval bogus funcall like (foo) and (0) then i get  
error messages as I would expect:

#;1> (foo)
Error: unbound variable: foo
        Call history:
        <syntax>          (foo)
        <eval>            (foo)   <--
#;1> (0)
Error: call of non-procedure: 0
        Call history:
        <syntax>          (0)
        <eval>            (0)     <--
#;1>

but if i do the same in my app via CHICKEN_eval_string_to_string then  
the (foo) case gets caught but the (0) case crashes my app :/

calling eval node 2, input '(0)'
[1]+  Bus error               exec build/Release/Grace.app/Contents/ 
MacOS/grace


i know from tracing that this call never returns:

     res = CHICKEN_eval_string_to_string( (char *)expr.toUTF8(),
                                           schemeThread->evalBuffer,
                                           8192);

does anyone have an idea about what might make the (foo) error get  
trapped but (0) crash the app?


thanks for any hints!

best, rick