Scm_SysGroupClass 2695 src/gauche.h   SCM_CLASS_DECL(Scm_SysGroupClass);
Scm_SysGroupClass 2696 src/gauche.h   #define SCM_CLASS_SYS_GROUP    (&Scm_SysGroupClass)
Scm_SysGroupClass  986 src/system.c   SCM_DEFINE_BUILTIN_CLASS_SIMPLE(Scm_SysGroupClass, grp_print);
Scm_SysGroupClass 1640 src/system.c       Scm_InitStaticClass(&Scm_SysGroupClass, "<sys-group>", mod, grp_slots, 0);