package containers

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package containers
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Library
Module
Module type
Parameter
Class
Class type
include module type of struct include Format end
Boxes
val open_box : int -> unit

open_box d opens a new pretty-printing box with offset d.

This box prints material as much as possible on every line.

A break hint splits the line if there is no more room on the line to print the remainder of the box. A break hint also splits the line if the splitting ``moves to the left'' (i.e. it gives an indentation smaller than the one of the current line).

This box is the general purpose pretty-printing box.

If the pretty-printer splits the line in the box, offset d is added to the current indentation.

val close_box : unit -> unit

Closes the most recently opened pretty-printing box.

Formatting functions
val print_string : string -> unit

print_string str prints str in the current box.

val print_as : int -> string -> unit

print_as len str prints str in the current box. The pretty-printer formats str as if it were of length len.

val print_int : int -> unit

Prints an integer in the current box.

val print_float : float -> unit

Prints a floating point number in the current box.

val print_char : char -> unit

Prints a character in the current box.

val print_bool : bool -> unit

Prints a boolean in the current box.

Break hints

A 'break hint' tells the pretty-printer to output some space or split the line whichever way is more appropriate to the current box splitting rules.

Break hints are used to separate printing items and are mandatory to let the pretty-printer correctly split lines and indent items.

Simple break hints are:

  • the 'space': output a space or split the line if appropriate,
  • the 'cut': split the line if appropriate.

Note: the notions of space and line splitting are abstract for the pretty-printing engine, since those notions can be completely defined by the programmer. However, in the pretty-printer default setting, ``output a space'' simply means printing a space character (ASCII code 32) and ``split the line'' is printing a newline character (ASCII code 10).

val print_space : unit -> unit

print_space () the 'space' break hint: the pretty-printer may split the line at this point, otherwise it prints one space. It is equivalent to print_break 1 0.

val print_cut : unit -> unit

print_cut () the 'cut' break hint: the pretty-printer may split the line at this point, otherwise it prints nothing. It is equivalent to print_break 0 0.

val print_break : int -> int -> unit

print_break nspaces offset the 'full' break hint: the pretty-printer may split the line at this point, otherwise it prints nspaces spaces.

If the pretty-printer splits the line, offset is added to the current indentation.

val print_flush : unit -> unit

Flushes the pretty printer: all opened boxes are closed, and all pending text is displayed.

val print_newline : unit -> unit

Equivalent to print_flush followed by a new line.

val force_newline : unit -> unit

Forces a new line in the current box. Not the normal way of pretty-printing, since the new line does not reset the current line count. You should prefer using break hints within a vertcal box.

val print_if_newline : unit -> unit

Executes the next formatting command if the preceding line has just been split. Otherwise, ignore the next formatting command.

Margin
val set_margin : int -> unit

set_margin d sets the right margin to d (in characters): the pretty-printer splits lines that overflow the right margin according to the break hints given. Nothing happens if d is smaller than 2. If d is too large, the right margin is set to the maximum admissible value (which is greater than 10^9).

val get_margin : unit -> int

Returns the position of the right margin.

Maximum indentation limit
val set_max_indent : int -> unit

set_max_indent d sets the maximum indentation limit of lines to d (in characters): once this limit is reached, new boxes are rejected to the left, if they do not fit on the current line. Nothing happens if d is smaller than 2. If d is too large, the limit is set to the maximum admissible value (which is greater than 10 ^ 9).

val get_max_indent : unit -> int

Return the maximum indentation limit (in characters).

Formatting depth: maximum number of boxes allowed before ellipsis
val set_max_boxes : int -> unit

set_max_boxes max sets the maximum number of boxes simultaneously opened. Material inside boxes nested deeper is printed as an ellipsis (more precisely as the text returned by get_ellipsis_text ()). Nothing happens if max is smaller than 2.

val get_max_boxes : unit -> int

Returns the maximum number of boxes allowed before ellipsis.

val over_max_boxes : unit -> bool

Tests if the maximum number of boxes allowed have already been opened.

Advanced formatting
val open_hbox : unit -> unit

open_hbox () opens a new 'horizontal' pretty-printing box.

This box prints material on a single line.

Break hints in a horizontal box never split the line. (Line splitting may still occur inside boxes nested deeper).

val open_vbox : int -> unit

open_vbox d opens a new 'vertical' pretty-printing box with offset d.

This box prints material on as many lines as break hints in the box.

Every break hint in a vertical box splits the line.

If the pretty-printer splits the line in the box, d is added to the current indentation.

val open_hvbox : int -> unit

open_hvbox d opens a new 'horizontal-vertical' pretty-printing box with offset d.

This box behaves as an horizontal box if it fits on a single line, otherwise it behaves as a vertical box.

If the pretty-printer splits the line in the box, d is added to the current indentation.

val open_hovbox : int -> unit

open_hovbox d opens a new 'horizontal-or-vertical' pretty-printing box with offset d.

This box prints material as much as possible on every line.

A break hint splits the line if there is no more room on the line to print the remainder of the box.

If the pretty-printer splits the line in the box, d is added to the current indentation.

Ellipsis
val set_ellipsis_text : string -> unit

Set the text of the ellipsis printed when too many boxes are opened (a single dot, ., by default).

val get_ellipsis_text : unit -> string

Return the text of the ellipsis.

Semantic Tags
type tag = string

Semantic tags (or simply tags) are used to decorate printed entities for user's defined purposes, e.g. setting font and giving size indications for a display device, or marking delimitation of semantic entities (e.g. HTML or TeX elements or terminal escape sequences).

By default, those tags do not influence line splitting calculation: the tag 'markers' are not considered as part of the printing material that drives line splitting (in other words, the length of those strings is considered as zero for line splitting).

Thus, tag handling is in some sense transparent to pretty-printing and does not interfere with usual indentation. Hence, a single pretty printing routine can output both simple 'verbatim' material or richer decorated output depending on the treatment of tags. By default, tags are not active, hence the output is not decorated with tag information. Once set_tags is set to true, the pretty printer engine honours tags and decorates the output accordingly.

When a tag has been opened (or closed), it is both and successively 'printed' and 'marked'. Printing a tag means calling a formatter specific function with the name of the tag as argument: that 'tag printing' function can then print any regular material to the formatter (so that this material is enqueued as usual in the formatter queue for further line splitting computation). Marking a tag means to output an arbitrary string (the 'tag marker'), directly into the output device of the formatter. Hence, the formatter specific 'tag marking' function must return the tag marker string associated to its tag argument. Being flushed directly into the output device of the formatter, tag marker strings are not considered as part of the printing material that drives line splitting (in other words, the length of the strings corresponding to tag markers is considered as zero for line splitting). In addition, advanced users may take advantage of the specificity of tag markers to be precisely output when the pretty printer has already decided where to split the lines, and precisely when the queue is flushed into the output device.

In the spirit of HTML tags, the default tag marking functions output tags enclosed in "<" and ">": hence, the opening marker of tag t is "<t>" and the closing marker "</t>".

Default tag printing functions just do nothing.

Tag marking and tag printing functions are user definable and can be set by calling set_formatter_tag_functions.

val open_tag : tag -> unit

open_tag t opens the tag named t; the print_open_tag function of the formatter is called with t as argument; the tag marker mark_open_tag t will be flushed into the output device of the formatter.

val close_tag : unit -> unit

close_tag () closes the most recently opened tag t. In addition, the print_close_tag function of the formatter is called with t as argument. The marker mark_close_tag t will be flushed into the output device of the formatter.

val set_tags : bool -> unit

set_tags b turns on or off the treatment of tags (default is off).

val set_print_tags : bool -> unit

set_print_tags b turns on or off the printing of tags.

val set_mark_tags : bool -> unit

set_mark_tags b turns on or off the output of tag markers.

val get_print_tags : unit -> bool

Return the current status of tags printing.

val get_mark_tags : unit -> bool

Return the current status of tags marking.

Redirecting the standard formatter output
val set_formatter_out_channel : Pervasives.out_channel -> unit

Redirect the pretty-printer output to the given channel. (All the output functions of the standard formatter are set to the default output functions printing to the given channel.)

val set_formatter_output_functions : (string -> int -> int -> unit) -> (unit -> unit) -> unit

set_formatter_output_functions out flush redirects the pretty-printer output functions to the functions out and flush.

The out function performs all the pretty-printer string output. It is called with a string s, a start position p, and a number of characters n; it is supposed to output characters p to p + n - 1 of s.

The flush function is called whenever the pretty-printer is flushed (via conversion %!, or pretty-printing indications @? or @., or using low level functions print_flush or print_newline).

val get_formatter_output_functions : unit -> (string -> int -> int -> unit) * (unit -> unit)

Return the current output functions of the pretty-printer.

Changing the meaning of standard formatter pretty printing

The Format module is versatile enough to let you completely redefine the meaning of pretty printing: you may provide your own functions to define how to handle indentation, line splitting, and even printing of all the characters that have to be printed!

type formatter_out_functions = Format.formatter_out_functions = {
  1. out_string : string -> int -> int -> unit;
  2. out_flush : unit -> unit;
  3. out_newline : unit -> unit;
  4. out_spaces : int -> unit;
}
  • since 4.01.0
val set_formatter_out_functions : formatter_out_functions -> unit

set_formatter_out_functions f Redirect the pretty-printer output to the functions f.out_string and f.out_flush as described in set_formatter_output_functions. In addition, the pretty-printer function that outputs a newline is set to the function f.out_newline and the function that outputs indentation spaces is set to the function f.out_spaces.

This way, you can change the meaning of indentation (which can be something else than just printing space characters) and the meaning of new lines opening (which can be connected to any other action needed by the application at hand). The two functions f.out_spaces and f.out_newline are normally connected to f.out_string and f.out_flush: respective default values for f.out_space and f.out_newline are f.out_string (String.make n ' ') 0 n and f.out_string "\n" 0 1.

  • since 4.01.0
val get_formatter_out_functions : unit -> formatter_out_functions

Return the current output functions of the pretty-printer, including line splitting and indentation functions. Useful to record the current setting and restore it afterwards.

  • since 4.01.0
Changing the meaning of printing semantic tags
type formatter_tag_functions = Format.formatter_tag_functions = {
  1. mark_open_tag : tag -> string;
  2. mark_close_tag : tag -> string;
  3. print_open_tag : tag -> unit;
  4. print_close_tag : tag -> unit;
}

The tag handling functions specific to a formatter: mark versions are the 'tag marking' functions that associate a string marker to a tag in order for the pretty-printing engine to flush those markers as 0 length tokens in the output device of the formatter. print versions are the 'tag printing' functions that can perform regular printing when a tag is closed or opened.

val set_formatter_tag_functions : formatter_tag_functions -> unit

set_formatter_tag_functions tag_funs changes the meaning of opening and closing tags to use the functions in tag_funs.

When opening a tag name t, the string t is passed to the opening tag marking function (the mark_open_tag field of the record tag_funs), that must return the opening tag marker for that name. When the next call to close_tag () happens, the tag name t is sent back to the closing tag marking function (the mark_close_tag field of record tag_funs), that must return a closing tag marker for that name.

The print_ field of the record contains the functions that are called at tag opening and tag closing time, to output regular material in the pretty-printer queue.

val get_formatter_tag_functions : unit -> formatter_tag_functions

Return the current tag functions of the pretty-printer.

Multiple formatted output
type formatter = Format.formatter

Abstract data corresponding to a pretty-printer (also called a formatter) and all its machinery.

Defining new pretty-printers permits unrelated output of material in parallel on several output channels. All the parameters of a pretty-printer are local to a formatter: margin, maximum indentation limit, maximum number of boxes simultaneously opened, ellipsis, and so on, are specific to each pretty-printer and may be fixed independently. Given a Pervasives.out_channel output channel oc, a new formatter writing to that channel is simply obtained by calling formatter_of_out_channel oc. Alternatively, the make_formatter function allocates a new formatter with explicit output and flushing functions (convenient to output material to strings for instance).

val formatter_of_out_channel : Pervasives.out_channel -> formatter

formatter_of_out_channel oc returns a new formatter that writes to the corresponding channel oc.

val std_formatter : formatter

The standard formatter used by the formatting functions above. It is defined as formatter_of_out_channel stdout.

val err_formatter : formatter

A formatter to use with formatting functions below for output to standard error. It is defined as formatter_of_out_channel stderr.

val formatter_of_buffer : Buffer.t -> formatter

formatter_of_buffer b returns a new formatter writing to buffer b. As usual, the formatter has to be flushed at the end of pretty printing, using pp_print_flush or pp_print_newline, to display all the pending material.

val stdbuf : Buffer.t

The string buffer in which str_formatter writes.

val str_formatter : formatter

A formatter to use with formatting functions below for output to the stdbuf string buffer. str_formatter is defined as formatter_of_buffer stdbuf.

val flush_str_formatter : unit -> string

Returns the material printed with str_formatter, flushes the formatter and resets the corresponding buffer.

val make_formatter : (string -> int -> int -> unit) -> (unit -> unit) -> formatter

make_formatter out flush returns a new formatter that writes according to the output function out, and the flushing function flush. For instance, a formatter to the Pervasives.out_channel oc is returned by make_formatter (Pervasives.output oc) (fun () -> Pervasives.flush oc).

Basic functions to use with formatters
val pp_open_hbox : formatter -> unit -> unit
val pp_open_vbox : formatter -> int -> unit
val pp_open_hvbox : formatter -> int -> unit
val pp_open_hovbox : formatter -> int -> unit
val pp_open_box : formatter -> int -> unit
val pp_close_box : formatter -> unit -> unit
val pp_open_tag : formatter -> string -> unit
val pp_close_tag : formatter -> unit -> unit
val pp_print_string : formatter -> string -> unit
val pp_print_as : formatter -> int -> string -> unit
val pp_print_int : formatter -> int -> unit
val pp_print_float : formatter -> float -> unit
val pp_print_char : formatter -> char -> unit
val pp_print_bool : formatter -> bool -> unit
val pp_print_break : formatter -> int -> int -> unit
val pp_print_cut : formatter -> unit -> unit
val pp_print_space : formatter -> unit -> unit
val pp_force_newline : formatter -> unit -> unit
val pp_print_flush : formatter -> unit -> unit
val pp_print_newline : formatter -> unit -> unit
val pp_print_if_newline : formatter -> unit -> unit
val pp_set_tags : formatter -> bool -> unit
val pp_set_print_tags : formatter -> bool -> unit
val pp_set_mark_tags : formatter -> bool -> unit
val pp_get_print_tags : formatter -> unit -> bool
val pp_get_mark_tags : formatter -> unit -> bool
val pp_set_margin : formatter -> int -> unit
val pp_get_margin : formatter -> unit -> int
val pp_set_max_indent : formatter -> int -> unit
val pp_get_max_indent : formatter -> unit -> int
val pp_set_max_boxes : formatter -> int -> unit
val pp_get_max_boxes : formatter -> unit -> int
val pp_over_max_boxes : formatter -> unit -> bool
val pp_set_ellipsis_text : formatter -> string -> unit
val pp_get_ellipsis_text : formatter -> unit -> string
val pp_set_formatter_out_channel : formatter -> Pervasives.out_channel -> unit
val pp_set_formatter_output_functions : formatter -> (string -> int -> int -> unit) -> (unit -> unit) -> unit
val pp_get_formatter_output_functions : formatter -> unit -> (string -> int -> int -> unit) * (unit -> unit)
val pp_set_formatter_tag_functions : formatter -> formatter_tag_functions -> unit
val pp_get_formatter_tag_functions : formatter -> unit -> formatter_tag_functions
val pp_set_formatter_out_functions : formatter -> formatter_out_functions -> unit
  • since 4.01.0
val pp_get_formatter_out_functions : formatter -> unit -> formatter_out_functions

These functions are the basic ones: usual functions operating on the standard formatter are defined via partial evaluation of these primitives. For instance, print_string is equal to pp_print_string std_formatter.

  • since 4.01.0
val pp_flush_formatter : formatter -> unit

pp_flush_formatter fmt flushes fmt's internal queue, ensuring that all the printing and flushing actions have been performed. In addition, this operation will close all boxes and reset the state of the formatter.

This will not flush fmt's output. In most cases, the user may want to use pp_print_flush instead.

  • since 4.04.0
Convenience formatting functions.
val pp_print_list : ?pp_sep:(formatter -> unit -> unit) -> (formatter -> 'a -> unit) -> formatter -> 'a list -> unit

pp_print_list ?pp_sep pp_v ppf l prints items of list l, using pp_v to print each item, and calling pp_sep between items (pp_sep defaults to pp_print_cut). Does nothing on empty lists.

  • since 4.02.0
val pp_print_text : formatter -> string -> unit

pp_print_text ppf s prints s with spaces and newlines respectively printed with pp_print_space and pp_force_newline.

  • since 4.02.0
printf like functions for pretty-printing.
val fprintf : formatter -> ('a, formatter, unit) Pervasives.format -> 'a

fprintf ff fmt arg1 ... argN formats the arguments arg1 to argN according to the format string fmt, and outputs the resulting string on the formatter ff.

The format fmt is a character string which contains three types of objects: plain characters and conversion specifications as specified in the Printf module, and pretty-printing indications specific to the Format module.

The pretty-printing indication characters are introduced by a @ character, and their meanings are:

  • @[: open a pretty-printing box. The type and offset of the box may be optionally specified with the following syntax: the < character, followed by an optional box type indication, then an optional integer offset, and the closing > character. Box type is one of h, v, hv, b, or hov. 'h' stands for an 'horizontal' box, 'v' stands for a 'vertical' box, 'hv' stands for an 'horizontal-vertical' box, 'b' stands for an 'horizontal-or-vertical' box demonstrating indentation, 'hov' stands a simple 'horizontal-or-vertical' box. For instance, @[<hov 2> opens an 'horizontal-or-vertical' box with indentation 2 as obtained with open_hovbox 2. For more details about boxes, see the various box opening functions open_*box.
  • @]: close the most recently opened pretty-printing box.
  • @,: output a 'cut' break hint, as with print_cut ().
  • @ : output a 'space' break hint, as with print_space ().
  • @;: output a 'full' break hint as with print_break. The nspaces and offset parameters of the break hint may be optionally specified with the following syntax: the < character, followed by an integer nspaces value, then an integer offset, and a closing > character. If no parameters are provided, the good break defaults to a 'space' break hint.
  • @.: flush the pretty printer and split the line, as with print_newline ().
  • @<n>: print the following item as if it were of length n. Hence, printf "@<0>%s" arg prints arg as a zero length string. If @<n> is not followed by a conversion specification, then the following character of the format is printed as if it were of length n.
  • @\{: open a tag. The name of the tag may be optionally specified with the following syntax: the < character, followed by an optional string specification, and the closing > character. The string specification is any character string that does not contain the closing character '>'. If omitted, the tag name defaults to the empty string. For more details about tags, see the functions open_tag and close_tag.
  • @\}: close the most recently opened tag.
  • @?: flush the pretty printer as with print_flush (). This is equivalent to the conversion %!.
  • @\n: force a newline, as with force_newline (), not the normal way of pretty-printing, you should prefer using break hints inside a vertical box.

Note: If you need to prevent the interpretation of a @ character as a pretty-printing indication, you must escape it with a % character. Old quotation mode @@ is deprecated since it is not compatible with formatted input interpretation of character '@'.

Example: printf "@[%s@ %d@]@." "x =" 1 is equivalent to open_box (); print_string "x ="; print_space (); print_int 1; close_box (); print_newline (). It prints x = 1 within a pretty-printing 'horizontal-or-vertical' box.

val printf : ('a, formatter, unit) Pervasives.format -> 'a

Same as fprintf above, but output on std_formatter.

val eprintf : ('a, formatter, unit) Pervasives.format -> 'a

Same as fprintf above, but output on err_formatter.

val asprintf : ('a, formatter, unit, string) Pervasives.format4 -> 'a

Same as printf above, but instead of printing on a formatter, returns a string containing the result of formatting the arguments. The type of asprintf is general enough to interact nicely with %a conversions.

  • since 4.01.0
val ifprintf : formatter -> ('a, formatter, unit) Pervasives.format -> 'a

Same as fprintf above, but does not print anything. Useful to ignore some material when conditionally printing.

  • since 3.10.0

Formatted output functions with continuations.

val kfprintf : (formatter -> 'a) -> formatter -> ('b, formatter, unit, 'a) Pervasives.format4 -> 'b

Same as fprintf above, but instead of returning immediately, passes the formatter to its first argument at the end of printing.

val ikfprintf : (formatter -> 'a) -> formatter -> ('b, formatter, unit, 'a) Pervasives.format4 -> 'b

Same as kfprintf above, but does not print anything. Useful to ignore some material when conditionally printing.

  • since 3.12.0
val ksprintf : (string -> 'a) -> ('b, unit, string, 'a) Pervasives.format4 -> 'b

Same as sprintf above, but instead of returning the string, passes it to the first argument.

val kasprintf : (string -> 'a) -> ('b, formatter, unit, 'a) Pervasives.format4 -> 'b

Same as asprintf above, but instead of returning the string, passes it to the first argument.

  • since 4.03
Deprecated
val bprintf : Buffer.t -> ('a, formatter, unit) Pervasives.format -> 'a
  • deprecated

    This function is error prone. Do not use it.

    If you need to print to some buffer b, you must first define a formatter writing to b, using let to_b = formatter_of_buffer b; then use regular calls to Format.fprintf on formatter to_b.

val kprintf : (string -> 'a) -> ('b, unit, string, 'a) Pervasives.format4 -> 'b
  • deprecated

    An alias for ksprintf.

val set_all_formatter_output_functions : out:(string -> int -> int -> unit) -> flush:(unit -> unit) -> newline:(unit -> unit) -> spaces:(int -> unit) -> unit
  • deprecated

    Subsumed by set_formatter_out_functions.

val get_all_formatter_output_functions : unit -> (string -> int -> int -> unit) * (unit -> unit) * (unit -> unit) * (int -> unit)
  • deprecated

    Subsumed by get_formatter_out_functions.

val pp_set_all_formatter_output_functions : formatter -> out:(string -> int -> int -> unit) -> flush:(unit -> unit) -> newline:(unit -> unit) -> spaces:(int -> unit) -> unit
  • deprecated

    Subsumed by pp_set_formatter_out_functions.

val pp_get_all_formatter_output_functions : formatter -> unit -> (string -> int -> int -> unit) * (unit -> unit) * (unit -> unit) * (int -> unit)
  • deprecated

    Subsumed by pp_get_formatter_out_functions.

Tabulation boxes are deprecated.

val pp_open_tbox : formatter -> unit -> unit
  • deprecated

    since 4.03.0

val pp_close_tbox : formatter -> unit -> unit
  • deprecated

    since 4.03.0

val pp_print_tbreak : formatter -> int -> int -> unit
  • deprecated

    since 4.03.0

val pp_set_tab : formatter -> unit -> unit
  • deprecated

    since 4.03.0

val pp_print_tab : formatter -> unit -> unit
  • deprecated

    since 4.03.0

val open_tbox : unit -> unit
  • deprecated

    since 4.03.0

val close_tbox : unit -> unit
  • deprecated

    since 4.03.0

val print_tbreak : int -> int -> unit
  • deprecated

    since 4.03.0

val set_tab : unit -> unit
  • deprecated

    since 4.03.0

val print_tab : unit -> unit
  • deprecated

    since 4.03.0

include module type of struct include CCFormat end

Helpers for Format

  • since 0.8
type 'a sequence = ('a -> unit) -> unit
type 'a printer = t -> 'a -> unit

Combinators

val silent : 'a printer

prints nothing

val unit : unit printer
val int : int printer
val string : string printer
val bool : bool printer
val float3 : float printer
val float : float printer
val list : ?start:string -> ?stop:string -> ?sep:string -> 'a printer -> 'a list printer
val array : ?start:string -> ?stop:string -> ?sep:string -> 'a printer -> 'a array printer
val arrayi : ?start:string -> ?stop:string -> ?sep:string -> (int * 'a) printer -> 'a array printer
val seq : ?start:string -> ?stop:string -> ?sep:string -> 'a printer -> 'a sequence printer
val opt : 'a printer -> 'a option printer
val pair : 'a printer -> 'b printer -> ('a * 'b) printer
val triple : 'a printer -> 'b printer -> 'c printer -> ('a * 'b * 'c) printer
val quad : 'a printer -> 'b printer -> 'c printer -> 'd printer -> ('a * 'b * 'c * 'd) printer
val map : ('a -> 'b) -> 'b printer -> 'a printer

IO

val output : t -> 'a printer -> 'a -> unit
val to_string : 'a printer -> 'a -> string
val stdout : t
val stderr : t
val sprintf : ('a, t, unit, string) Pervasives.format4 -> 'a

print into a string

val to_file : string -> ('a, t, unit, unit) Pervasives.format4 -> 'a

Print to the given file

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