eval.c:10014
static VALUE thgroup_s_alloc _((VALUE));
static VALUE
thgroup_s_alloc(klass)
    VALUE klass;
{
    VALUE group;
    struct thgroup *data;

    group = Data_Make_Struct(klass, struct thgroup, 0, free, data);
    data->enclosed = 0;
    data->group = group;

    return group;
}
