$ csi -s udisks.scm

Error: (assq) bad argument type: #f

        Call history:

        dbus.scm:809: ##sys#gc    
        dbus.scm:832: g1354       
        dbus.scm:201: find-callback       
        dbus.scm:674: ##sys#peek-c-string         
        dbus.scm:689: string?->symbol     
        dbus.scm:245: string->symbol      
        dbus.scm:677: ##sys#peek-c-string         
        dbus.scm:690: string?->symbol     
        dbus.scm:245: string->symbol      
        dbus.scm:680: ##sys#peek-c-string         
        dbus.scm:691: string?->symbol     
        dbus.scm:245: string->symbol      
        dbus.scm:686: ##sys#peek-c-string         
        dbus.scm:692: string?->symbol     
        dbus.scm:245: string->symbol      
        dbus.scm:701: tassq             <--