job.vim

func! CloseHandler(channel)
  while ch_status(a:channel) == 'buffered'
    echomsg ch_read(a:channel)
  endwhile
endfunc
let job = job_start(['go', 'build'], {'close_cb': 'CloseHandler'})

main.go

package main

func main() {
	a
	b
	c
}

Gives error:

channel activity log.

call ch_logfile('/tmp/channellog', 'w')

==== start log session ====
  0.000021 : Starting job: go  build
  0.000039 on 1: Created channel
  0.000574 : looking for messages on channels
  0.040895 RECV on 1: '# local/haya14busa/tmp
./main.go:4: undefined: a
./main.go:5: undefined: b
./main.go:6: undefined: c
'
  0.041631 ERR on 1: channel_select_check(): Cannot read from channel, will close it soon
  0.041639 : looking for messages on channels
  0.041641 on 1: Closing channel because of previous read error
  0.041643 on 1: Closing channel
  0.041652 on 1: Invoking callbacks before closing
  0.041654 on 1: Invoking close callback CloseHandler
  0.043392 : looking for messages on channels
  1.453627 on 1: Dropping message '# local/haya14busa/tmp
./main.go:4: undefined: a
./main.go:5: undefined: b
./main.go:6: undefined: c
'
  1.453638 : looking for messages on channels
  8.063839 on 1: Job ended
  8.064224 : looking for messages on channels