go build -race github.com/gdamore/gomatrix
./gomatrics 2>/tmp/t

==================
WARNING: DATA RACE
Read at 0x00000084f0e8 by goroutine 277:
  main.(*Stream).run()
      /home/dfc/src/github.com/gdamore/gomatrix/stream.go:52 +0x534

Previous write at 0x00000084f0e8 by main goroutine:
  main.main()
      /home/dfc/src/github.com/gdamore/gomatrix/main.go:72 +0xf83

Goroutine 277 (running) created at:
  main.(*StreamDisplay).run()
      /home/dfc/src/github.com/gdamore/gomatrix/stream.go:131 +0x260
==================
==================
WARNING: DATA RACE
Write at 0x00c4204929f0 by goroutine 274:
  runtime.mapassign_fast64()
      /home/dfc/go/src/runtime/hashmap_fast.go:512 +0x0
  main.(*StreamDisplay).run()
      /home/dfc/src/github.com/gdamore/gomatrix/stream.go:128 +0x220

Previous write at 0x00c4204929f0 by goroutine 289:
  runtime.mapdelete_fast64()
      /home/dfc/go/src/runtime/hashmap_fast.go:748 +0x0
  main.(*Stream).run()
      /home/dfc/src/github.com/gdamore/gomatrix/stream.go:80 +0x464

Goroutine 274 (running) created at:
  main.main.func1()
      /home/dfc/src/github.com/gdamore/gomatrix/main.go:184 +0x671

Goroutine 289 (finished) created at:
  main.(*StreamDisplay).run()
      /home/dfc/src/github.com/gdamore/gomatrix/stream.go:131 +0x260
==================
==================
WARNING: DATA RACE
Write at 0x00c420086780 by goroutine 365:
  runtime.mapdelete_fast64()
      /home/dfc/go/src/runtime/hashmap_fast.go:748 +0x0
  main.(*Stream).run()
      /home/dfc/src/github.com/gdamore/gomatrix/stream.go:80 +0x464

Previous write at 0x00c420086780 by goroutine 294:
  runtime.mapdelete_fast64()
      /home/dfc/go/src/runtime/hashmap_fast.go:748 +0x0
  main.(*Stream).run()
      /home/dfc/src/github.com/gdamore/gomatrix/stream.go:80 +0x464

Goroutine 365 (running) created at:
  main.(*StreamDisplay).run()
      /home/dfc/src/github.com/gdamore/gomatrix/stream.go:131 +0x260

Goroutine 294 (finished) created at:
  main.(*StreamDisplay).run()
      /home/dfc/src/github.com/gdamore/gomatrix/stream.go:131 +0x260
==================
Found 3 data race(s)