IOREAD
if ((io->flag&IOTYPE) != IOREAD)
case IOREAD:
: (iotype == IOREAD || iotype == IOHERE) ?
iop->flag = c == '>' ? IOWRITE : IOREAD;
&& (yylval.iop->flag == IOREAD
save = wdcopy(yylval.iop->flag == IOREAD ?
expected = (type == IOREAD || type == IORDWR || type == IOHERE) ? 0
case IOREAD: