`sig
type text
class input_line :
CamomileLibrary.Type.UChar.t
#CamomileLibrary.Type.OOChannel.obj_input_channel ->
[CamomileLibrary.Type.ULine.Type.text] OOChannel.obj_input_channel
class output_line :
?sp:CamomileLibrary.Type.ULine.separator ->
CamomileLibrary.Type.UChar.t
#CamomileLibrary.Type.OOChannel.obj_output_channel ->
[CamomileLibrary.Type.ULine.Type.text] OOChannel.obj_output_channel
end`