eval.c:687
static struct RVarmap*
new_dvar(id, value, prev)
    ID id;
    VALUE value;
    struct RVarmap *prev;
{
    NEWOBJ(vars, struct RVarmap);
    OBJSETUP(vars, 0, T_VARMAP);
    vars->id = id;
    vars->val = value;
    vars->next = prev;

    return vars;
}
