bufio: buffer full

[jhchabran]

Hey @bobheadxi as I was working with release tooling which uses sourcegraph/run, I stumbled across a bufio: buffer full error.

Here is a test case to reproduce the error:

// stream_test.go
func TestPOF(t *testing.T) {
	newStream := func() *streamline.Stream {
		veryLongLine := "long"
		for i := 0; i < 1000; i++ {
			veryLongLine += "loooooooong"
		}
		return streamline.New(strings.NewReader(veryLongLine))
	}

	s := newStream()
	err := s.Stream(func(line string) {
	})
	if err != nil {
		t.Log(err.Error())
		t.Fail()
	}
}

While the example here is a bit exaggerated, I got the same error while streaming the response of a curl to an API that sends back JSON, so my original case is rather legitimate.