Stdppx.Out_channelval create :
?binary:bool ->
?append:bool ->
?fail_if_exists:bool ->
?perm:int ->
string ->
Caml.out_channelval with_file :
?binary:bool ->
?append:bool ->
?fail_if_exists:bool ->
?perm:int ->
string ->
f:(Caml.out_channel -> 'a) ->
'a