581   let ch = job_getchannel(job)
583   call assert_fails('let j = ch + 1', 'E913:')
585   call assert_fails('echo 2.0 == ch', 'E914:')
733 func BufCloseCb(ch)  argument
1321         \ {'out_cb': {ch, msg -> execute("let g:Ch_outmsg = 'lambda: ' . msg")},
1323         \  'err_cb': {ch, msg -> execute(":let g:Ch_errmsg = 'lambda: ' . msg")},
1341   func g:retdict.close_cb(ch) dict  argument
1342     let self.ret['close_cb'] = a:ch->ch_getjob()->job_status()
1449   call assert_fails("let ch = ch_open('noserver')", 'E475:')
1450   echo ch
1451   let d = ch
1452   call assert_fails("let ch = ch_open('noserver', 10)", 'E474:')
1453   call assert_fails("let ch = ch_open('localhost:-1')", 'E475:')
1454   call assert_fails("let ch = ch_open('localhost:65537')", 'E475:')
1455   call assert_fails("let ch = ch_open('localhost:8765', {'timeout' : -1})",
1457   call assert_fails("let ch = ch_open('localhost:8765', {'axby' : 1})",
1459   call assert_fails("let ch = ch_open('localhost:8765', {'mode' : 'abc'})",
1461   call assert_fails("let ch = ch_open('localhost:8765', {'part' : 'out'})",
1463   call assert_fails("let ch = ch_open('[::]')", 'E475:')
1464   call assert_fails("let ch = ch_open('[::.80')", 'E475:')
1465   call assert_fails("let ch = ch_open('[::]8080')", 'E475:')
1598 function MyCloseCb(ch)  argument
1630   func g:Ch_d.closeCb(ch) dict  argument
1841   func s:close_cb(ch)  argument
1842     while ch_status(a:ch) == 'buffered'
1843       let g:out .= ch_read(a:ch)
1871   let job = job_start(cmd, {'callback': {ch,msg -> execute(":let g:echostr .= msg")}})
1887 …call job_start(cmd, {'callback': {ch,msg -> execute(":let g:envstr .= msg")}, 'env': {'FOO': 'bar'…
1902   let job = job_start(cmd, {'callback': {ch,msg -> execute(":let g:envstr .= msg")}, 'cwd': expect})
1924   call ch_setoptions(handle, {'close_cb': {ch -> execute("let g:Ch_close_ret = 'closed'")}})
1943 …let job = job_start([s:python, '-c', a:cmd], {'callback': {ch, msg -> execute('let g:out .= msg')}…
2041           \  'callback': {ch, msg -> execute('let g:out .= msg')}})
2244   let ch = test_null_channel()
2245   call assert_equal(-1, ch_getbufnr(ch, 'in'))
2246   call assert_equal(-1, ch_getbufnr(ch, 'out'))
2247   call assert_equal(-1, ch_getbufnr(ch, 'err'))
2248   call assert_equal(-1, ch_getbufnr(ch, ''))
2253   let ch = test_null_channel()
2273         \ {'channel' : ch},
2305     call assert_fails("let x = ch_status(ch, opt)", 'E475:')
2307   call assert_equal('fail', ch_status(ch, test_null_dict()))