}
		for category := range logs {
			event := mustFindLogV2(t, bytes.NewReader(traceData), category)
			if wantEvent := logs[category]; wantEvent == nil {
				logs[category] = &event
			} else if got, want := dumpStackV2(&event), dumpStackV2(wantEvent); got != want {
				t.Errorf("%q: got stack:\n%s\nwant stack:\n%s\n", category, got, want)
			}
		}
	}
}

func mustFindLogV2(t *testing.T, trc io.Reader, category string) trace.Event {