discard_ilseq=

static VALUE
iconv_set_discard_ilseq(VALUE self, VALUE discard_ilseq)
{
#ifdef ICONV_SET_DISCARD_ILSEQ
    int dis = RTEST(discard_ilseq);
    iconv_ctl(self, ICONV_SET_DISCARD_ILSEQ, dis);
#else
    rb_notimplement();
#endif
    return self;
}