[cwn] Attn: Development Editor, Latest OCaml Weekly News

[Alan Schmitt]

Hello


2019.

Table of Contents
─────────────────

OCaml 4.08.0+rc1
Dungeon crawler game
Jbuilder support will stop in one month
cstruct 5.0.0 with new capability types
Old CWN


OCaml 4.08.0+rc1
════════════════

 Archive:
 <https://sympa.inria.fr/sympa/arc/caml-list/2019-05/msg00041.html>


Damien Doligez announced
────────────────────────


 release candidate that you can test.

 The source code is available at these addresses:

 <https://github.com/ocaml/ocaml/archive/4.08.0+rc1.tar.gz>
 <https://caml.inria.fr/pub/distrib/ocaml-4.08/4.08.0+rc1.tar.gz>


 following commands.

 opam switch create ocaml-variants.4.08.0+rc1
 
–repositories=default,beta=git+<https://github.com/ocaml/ocaml-beta-repository.git>

 or

 opam switch create ocaml-variants.4.08.0+rc1+<VARIANT>
 
–repositories=default,beta=git+<https://github.com/ocaml/ocaml-beta-repository.git>

 where you replace <VARIANT> with one of these:
 • afl
 • default_unsafe_string
 • flambda
 • fp
 • fp+flambda

 We want to know about all bugs. Please report them here:
  <https://github.com/ocaml/ocaml/issues>

 Happy hacking,

 Damien Doligez for the OCaml team.


 (Changes that can break existing programs are marked with a "*")


Language features:
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌


   White, review by Thomas Refis)

 • #1892: Allow shadowing of items coming from an include (Thomas
   Refis, review by Gabriel Radanne)

 • #2122: Introduce local substitutions in signatures: "type t :=

   with help and review from Leo White, and Alain Frisch)

 • #1804: New notion of "alerts" that generalizes the deprecated

       Frisch, review by Leo White and Damien Doligez)

 • #6422, #7083, #305, #1568: Allow `exception' under or-patterns
   (Thomas Refis, with help and review from Alain Frisch, Gabriel
   Scherer, Jeremy Yallop, Leo White and Luc Maranget)


   review by Gabriel Radanne and Thomas Refis)


   (Runhang Li, review by Alain Frisch, Florian Angeletti, Jeremy
   Yallop, Leo White and Thomas Refis)


   Gabriel Scherer, Florian Angeletti, and Damien Doligez)


   directory that defines its own Result module will shadow the
   stdlib's.  (Jérémie Dimino, review by Alain Frisch and David
   Allsopp)


Type system:
╌╌╌╌╌╌╌╌╌╌╌╌

 • #2110: Partial support for GADTs inside or-patterns; The type

   Refis and Leo White, review by Jacques Garrigue)


   Refis and Leo White, review by Jacques Garrigue)

 • #1942, #2244: simplification of the static check for recursive

   Yallop, Armaël Guéneau and Damien Doligez)


Standard library:
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌


   is a "try_finally" combinator)

Here is the latest OCaml Weekly News, for the week of May 21 to 28, The release of OCaml version 4.08.0 is imminent. We have created a The compiler can also be installed as an OPAM switch with one of the • #1947: Introduce binding operators (let*, let+, and* etc.) (Leo type_expr" and "module M := Extended(Module).Path" (Thomas Refis, warning [@@ocaml.alert deprecated "Please use bar instead!"] [@@ocaml.alert unsafe "Please use safe_foo instead!"] (Alain • #1705: Allow @@attributes on exception declarations. (Hugo Heuzard, • #1506, #2147, #2166, #2167: Extended `open' to arbitrary module expression in structures and to applicative paths in signatures • * #2106: .~ is now a reserved keyword, and is no longer available for use in extended indexing operators (Jeremy Yallop, review by • * #7841, #2041, #2235: allow modules from include directories to shadow other ones, even in the toplevel; for a example, including a equalities introduced by the GADT constructor are only available inside the or-pattern; they cannot be used in the right-hand-side of the clause, when both sides of the or-pattern agree on it. (Thomas • #1826: allow expanding a type to a private abbreviation instead of abstracting when removing references to an identifier. (Thomas definitions (Alban Reynaud and Gabriel Scherer, review by Jeremy • #2128: Add Fun module: `id, const, flip, negate, protect' (protect <https://caml.inria.fr/pub/docs/manual-ocaml/libref/Fun.html> (Many

   fine eyes)

 • #2010: Add Bool module

<https://caml.inria.fr/pub/docs/manual-ocaml/libref/Bool.html> (Many

   fine eyes)

 • #2011: Add Int module

<https://caml.inria.fr/pub/docs/manual-ocaml/libref/Int.html> (Many

   fine eyes)


   value, get, bind, join, map, fold, iter', etc.
   <https://caml.inria.fr/pub/docs/manual-ocaml/libref/Option.html>
   (Many fine eyes)


   value, get_ok, bind, join, map, map_error', etc.
   <https://caml.inria.fr/pub/docs/manual-ocaml/libref/Result.html>
   (Many fine eyes)

 • #1855, #2118: Add `Fun.protect ~finally' for enforcing local
   invariants whether a function raises or not, similar to



   no longer needed and Stdlib should be used instead.  (Jérémie
   Dimino, review by Nicolás Ojeda Bär)


   and Gabriel Scherer)




   of digits.  (ygrek, review by Gabriel Scherer)

 • #1959: Add Format.dprintf, a printing function which outputs a
   closure usable with %t.  (Gabriel Radanne, request by Armaël
   Guéneau, review by Florian Angeletti and Gabriel Scherer)


   Scherer)


   Nicolás Ojeda Bär, suggestion by whitequark)


   representations of numbers (Alain Frisch and Daniel Bünzli)

 • #1458: Add unsigned operations unsigned_div, unsigned_rem,
   unsigned_compare and unsigned_to_int to modules Int32, Int64,
   Nativeint.  (Nicolás Ojeda Bär, review by Daniel Bünzli, Alain
   Frisch and Max Mouratov)


   break hint that can emit non-whitespace characters.  (Vladimir


 • #1966: Add Format semantic tags using extensible sum types.
   (Gabriel Radanne, review by Nicolás Ojeda Bär)


   is_finite, is_infinite, is_nan, is_integer, trunc, round,
   next_after, sign_bit, min, max, min_max, min_num, max_num,

   Frish, Xavier Clerc and Daniel Bünzli)


   review by Alain Frisch, Jacques-Henri Jourdan, Xavier Leroy)


   Frisch)


   Bour, report by Jules Villard, review by Gabriel Scherer)

 • #6701, #1185, #1803: make float_of_string and string_of_float
   locale-independent.  (ygrek, review by Xavier Leroy and Damien
   Doligez)

 • #7795, #1782: Fix off-by-one error in Weak.create.  (KC



   by Jun Furuse)


   a deprecation warning since 4.02.  (whitequark)


   -keyword=arg inputs (Valentin Gatien-Baron, review by Gabriel
   Scherer)


   (Gabriel Radanne, review by Gabriel Scherer)

 • #2119: clarify the documentation of Set.diff (Gabriel Scherer,
   suggestion by John Skaller)


   Doligez, review by Alain Frisch)


   (Pierre-Marie Pédrot, review by Nicolás Ojeda Bär)


   Clerc and Alain Frisch)


   (Damien Doligez, review by Gabriel Scherer and Jeremy Yallop)


   Weis, Richard Bonichon, review by Florian Angeletti)


   use functor hash function instead of default hash
   function. Hashtbl.Make.of_seq shouldn't create randomized hash
   tables.  (David Allsopp, review by Alain Frisch)


Other libraries:
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌


   Ojeda Bär, review by Daniel Bünzli, David Allsopp and ygrek)


   Volker Diels-Grabsch)


   process's pid.  (Romain Beauxis, review by Nicolás Ojeda Bär)


   by Stephen Dolan)

 • * #2104, #2211, #4127, #7709: Fix Thread.sigmask. When system
   threads are loaded, Unix.sigprocmask is now an alias for

   Unix.sigprocmask used to change the masks of all threads.
   (Jacques-Henri Jourdan, review by Jérémie Dimino)


   Doligez, David Allsopp, David Sheets)




   #Nicolás Ojeda Bär, Pierre Chambart)


   of `*_of_genarray (Unix.map_file ...)' functions instead. The



Compiler user-interface and warnings:
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌


   (Armaël Guéneau, review by Gabriel Scherer and Jérémie Dimino)

 • #2133: [@ocaml.warn_on_literal_pattern]: now warn on literal
   patterns found anywhere in a constructor's arguments.  (Jeremy
   Yallop, review by Gabriel Scherer)


   Gabriel Scherer, Frédéric Bour, Xavier Clerc and Leo White)


   Sébastien Hinderer and David Allsopp, request by Adrien Nader)


     message.
   • #1993, expanded error messages for universal quantification
      failure
   • #1998, more context for unbound type parameter error

     definitions (suggestion by Ivan Gotovchits)
   • #2094, rewording for "constructor has no type" error

     type

    Gabriel Radanne, Gabriel Scherer and Jeremy Yallop)


   (Valentin Gatien-Baron, review by Thomas Refis)


   configuration options related to type-checking: -rectypes,


 • #1976: Better error messages for extension constructor type
   mismatches (Thomas Refis, review by Gabriel Scherer)


   specify a list of additional include directories for the ocaml

   Daniel Bünzli and Damien Doligez)

 • #6638, #1110: introduced a dedicated warning to report unused

   design from Leo White)


   Alain Frisch and Jacques Garrigue)


   review by Nicolás Ojeda Bär)


   Gabriel Scherer)


   consistency with OSX & Linux. Previously was located at `lib'.
   (Bryan Phelps, Jordan Walke, review by David Allsopp)

 • #6416, #1120: unique printed names for identifiers (Florian
   Angeletti, review by Jacques Garrigue)

 • #1691: add shared_libraries to ocamlc -config exporting

   review by Gabriel Scherer and Mark Shinwell)


   review by Gabriel Scherer and Luc Maranget)


   discarded.  (Nicolás Ojeda Bär, review by Thomas Refis)

 • #1845: new `-dcamlprimc' option to keep the generated C file
   containing the information about primitives; pass
   `-fdebug-prefix-map' to the C compiler when supported, for
   reproducible builds (Xavier Clerc, review by Jérémie Dimino)


   in order to make builds reproducible if code contains uses of

   Sébastien Hinderer)


   warning (64) instead of a simple stderr message (Valentin
   Gatien-Baron)


   Gabriel Scherer and François Bobot)

 • #1930: pass the elements from `BUILD_PATH_PREFIX_MAP' to the
   assembler (Xavier Clerc, review by Gabriel Scherer, Sébastien
   Hinderer, and Xavier Leroy)


   compilation after the parsing or typing pass (Gabriel Scherer,
   review by Jérémie Dimino)


   review by Gabriel Radanne)


   by Gabriel Radanne)




   (Hugo Heuzard, review by Jérémie Dimino)


   Ojeda Bär, review by Armaël Guéneau)


Manual and documentation:
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌


   and Armaël Guéneau)

 • #7546, #2020: preambles and introduction for compiler-libs.

   Gabriel Scherer)


   Scherer)


   Pierre Weis)


   of modules (Florian Angeletti, review by Perry E. Metzger and
   Gabriel Scherer)

 • #1209, #2008: in the Extension section, use the caml_example

   change was made possible by a lot of tooling work from Florian
   Angeletti: #1702, #1765, #1863, and Gabriel Scherer's #1903.
   (Gabriel Scherer, review by Florian Angeletti)


   chapters:
   • #1788: quoted string description
   • #1831: local exceptions and exception cases
   • #2007: 32-bit, 64-bit and native integer literals
   • #2198: lazy patterns
   • #2232: short object copy notation
   (Florian Angeletti, review by Xavier Clerc, Perry E. Metzger,
    Gabriel Scherer and Jeremy Yallop)


   by Sébastien Hinderer and Gabriel Scherer)


   Flin, review by Florian Angeletti)


   (Florian Angeletti, review by Gabriel Scherer)


   from the manual inside a separate "OCaml_operators" module.

   Gabriel Scherer)


   review by Perry E. Metzger and Jeremy Yallop)

 • #8508: refresh \moduleref macro (Florian Angeletti, review by
   Gabriel Scherer)


Code generation and optimizations:
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

 • #7725, #1754: improve AFL instrumentation for objects and lazy
   values.  (Stephen Dolan)


   and Xavier Leroy)


   32bits (Jérémie Dimino)

 • #1917: comballoc: ensure object allocation order is preserved
   (Stephen Dolan)


   functions that do not escape and whose calls all have the same
   continuation are lowered into a static-catch handler.  (Alain
   Frisch, review by Gabriel Scherer)




   Alain Frisch)


Runtime system:
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌


   three GC parameters to give the user better control of the

   Alain Frisch)


   argument, -M prints the magic number expected by ocamlrun.



   David Allsopp, Damien Doligez, Sébastien Hinderer)


   for caml_round with GCC 7.4.  (David Allsopp, review by Xavier
   Leroy)


   review by Alain Frisch)

 • #1723: Remove internal Meta.static_{alloc,free} primitives.
   (Stephen Dolan, review by Gabriel Scherer)


   review by Xavier Leroy)


   and instrumented runtimes.  (Damien Doligez, report by Gabriel
   Scherer)

 • #2079: Avoid page table lookup in Pervasives.compare with

   Allsopp, Stephen Dolan)


   platforms) (David Allsopp and Damien Doligez)

 • #8567, #8569: on ARM64, use 32-bit loads to access

   Greta Yorsh)

 • #8568: Fix a memory leak in mmapped bigarrays (Damien Doligez,
   review by Xavier Leroy and Jérémie Dimino)


Tools
╌╌╌╌╌


   Troestler, review by Gabriel Scherer)

 • #1865: support dark themes in Emacs, and clean up usage of
   deprecated Emacs APIs (Wilfred Hughes, review by Clément
   Pit-Claudel)


   review by Jérémie Dimino)


   Gabriel Scherer)


   imenu crash.  (Wilfred Hughes, review by Christophe Troestler)


   imenu crash.  (Wilfred Hughes, review by Christophe Troestler)


   line -open flag.  (Nicolás Ojeda Bär, review by Mark Shinwell)


   (Florian Angeletti, review by Jérémie Dimino)


   by Gabriel Scherer and Daniel Bünzli)


   new line, for more readable diffs of versioned dependencies.
   (Gabriel Scherer, review by Nicolás Ojeda Bär)


   Hinderer and David Allsopp)


Compiler distribution build system:
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌

 • #1776: add -no-install-bytecode-programs and related configure

   Shinwell, review by Sébastien Hinderer and Gabriel Scherer)

 • #1777: add -no-install-source-artifacts and related configure



   Marcello Seri, Gabriel Scherer and Florian Angeletti)

 • #1797: remove the deprecated Makefile.nt files.  (Sébastien
   Hinderer, review by Nicolas Ojeda Bar)

 • #1805: fix the bootstrap procedure and its documentation.

   Gabriel Scherer)


   David Allsopp, Xavier Leroy and Damien Doligez)


   Xavier Leroy and Damien Doligez)


   (Sébastien Hinderer, review by Damien Doligez)

 • #2024: stop supporting obsolete platforms: Rhapsody (old beta
   version of MacOS X), BeOS, alpha*-​*​-linux*​, mips-​*​-irix6​​*​,

   i[3456]86-​*​-darwin[89].​*​, i[3456]86-​*​-solaris​*​, ​*​-​*​-sunos​*​
​*​-​*​-unicos.  (Sébastien Hinderer, review by Xavier Leroy, Damien
   Doligez, Gabriel Scherer and Armaël Guéneau)

 • #2053: allow unix, vmthreads and str not to be built.  (David
   Allsopp, review by Sébastien Hinderer)

 • * #2059: stop defining OCAML_STDLIB_DIR in s.h.  (Sébastien
   Hinderer, review by David Allsopp and Damien Doligez)

 • * #2066: remove the standard_runtime configuration variable.
   (Sébastien Hinderer, review by Xavier Leroy, Stephen Dolan and
   Damien Doligez)

 • * #2139: use autoconf to generate the compiler's configuration
   script (Sébastien Hinderer, review by Damien Doligez and David
   Allsopp)

 • #2148: fix a parallel build bug involving CamlinternalLazy.



   mode under Windows according to the value of the variable

   assumed to be the current code page encoding. If

   review by Sébastien Hinderer and David Allsopp)

 • #2266: ensure Cygwin ports configure with `EXE=.exe', or the

   of #2139/2041) (David Allsopp, report and review by Sébastien
   Hinderer)

 • #7919, #2311: Fix assembler detection in configure (Sébastien
   Hinderer, review by David Allsopp)


   Romanov, review by Sébastien Hinderer and David Allsopp)

 • #8528: get rid of the direct call to the C preprocessor in the
   testsuite (Sébastien Hinderer, review by David Allsopp)


   (Sébastien Hinderer, review by Xavier Leroy)


   by David Allsopp and Sébastien Hinderer)


   Yorsh, review by Gabriel Radanne)


   options (Sébastien Hinderer, review by David Allsopp, Gabriel
   Scherer and Damien Doligez)


   Allsopp, review by Sébastien Hinderer and Damien Doligez)


   (Sébastien Hinderer, review by Damien Doligez)


Internal/compiler-libs changes:
╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌╌


   and Gabriel Radanne, regression spotted by Clément Franchini)

 • #292: use Menhir as the parser generator for the OCaml parser.

   Allsopp)


   review by Gabriel Scherer)

 • #1148, #1287, #1288, #1874: significant improvements of the

   Allsopp, review by Damien Doligez and Sébastien Hinderer)


   Frédéric Bour and Thomas Refis)


   variables. (preliminary work for GADTs in or-patterns) (Thomas
   Refis, review by Leo White)

 • #1909: unsharing pattern types (preliminary work for GADTs in

   Jacques Garrigue)

 • #1748: do not error when instantiating polymorphic fields in
   patterns.  (Thomas Refis, review by Gabriel Scherer)


   (Thomas Refis and Leo White, review by Jacques Garrigue)

 • #1746: remove unreachable error variant: Make_seltype_nongen.
   (Florian Angeletti, review by Gabriel Radanne)


   or-patterns) (Thomas Refis, review by Jacques Garrigue)


   Clerc, review by Pierre Chambart)


   review by Xavier Clerc)


   Leroy and David Allsopp)

 • #1886: move the Location.absname reference to Clflags.absname
   (Armaël Guéneau, review by Jérémie Dimino)

 • #1894: generalize highlight_dumb in location.ml to handle

   Scherer)

 • #1903: parsetree, add locations to all nodes with attributes
   (Gabriel Scherer, review by Thomas Refis)


   git reference (Gabriel Scherer, review by David Allsopp)

 • #1910: improve the check-typo use of .gitattributes (Gabriel
   Scherer, review by David Allsopp and Damien Doligez)


   Angeletti, review by Alain Frisch and Gabriel Scherer)


   (Valentin Gatien-Baron, review by Florian Angeletti)

 • #1948: Refactor Stdlib.Format. Notably, use Stdlib.Stack and

   Keleshev, review by Nicolás Ojeda Bär and Gabriel Scherer)


   warnings `Location.report_error' is removed, use

   Refis)


   Refis, review by Jacques Garrigue and Leo White)


   and Thomas Refis)


   Nicolás Ojeda Bär)


   Dimino, review by Alain Frisch and David Allsopp)


   Scherer)


   Chambart)


   (Mark Shinwell, review by Pierre Chambart)

 • #2060: "Phantom let" support for the Clambda language.  (Mark
   Shinwell, review by Vincent Laviron)

 • #2065: Add [Proc.destroyed_at_reloadretaddr].  (Mark Shinwell,
   review by Damien Doligez)


   review by Vincent Laviron)


   Jacques Garrigue and Leo White)


   Shinwell, review by Jérémie Dimino)

 • #2076: Add [Targetint.print].  (Mark Shinwell)

 • #2080: Add [Proc.dwarf_register_numbers] and

   Bernhard Schommer)


   Damien Doligez)

 • #2152, #2517: refactorize the fixpoint to compute type-system
   properties of mutually-recursive type declarations.  (Gabriel
   Scherer and Rodolphe Lepigre, review by Armaël Guéneau)


   intermediate language, as a preparation step for more future

   themselves)


   Allsopp, review by Damien Doligez and Sébastien Hinderer)

 • * #2173: removed TypedtreeMap (Thomas Refis, review by Gabriel
   Scherer)

 • #7867: Fix #mod_use raising an exception for filenames with no
   extension.  (Geoff Gole)


   fix by Joe, review by Sébastien Hinderer)

 • #7847, #2019: Fix an infinite loop that could occur when the

   by Frédéric Bour, Thomas Refis, Gabriel Scherer)


   review by Gabriel Radanne)


   White)


   Garrigue)


   Frisch)


   Windows.  (David Allsopp, review by Sébastien Hinderer)


   (Thomas Refis, review by Gabriel Scherer)

 • #7238, #1825: in Unix.in_channel_of_descr and
   Unix.out_channel_of_descr, raise an error if the given file

   by Jérémie Dimino and Perry E. Metzger)


   (Gabriel Scherer and Nicolás Ojeda Bär, report by Guillaume
   Melquiond, review by Gabriel Scherer)

 • #1843: ocamloptp was doing the wrong thing with option

   Bär).


   by Leo White, review by Jacques Garrigue)


   Angeletti, report by Valentin Gatien-Baron, review by Gabriel
   Scherer)


   (Pieter Goetschalckx, review by Damien Doligez)

 • #7828, #1935: correct the conditions that generate warning 61,
   Unboxable_type_in_prim_decl (Stefan Muenzel)


   review by Gabriel Scherer)


   (Hugo Heuzard, review by Nicolás Ojeda Bär)

 • #1977: [@@ocaml.warning "…"] attributes attached to type

   Gabriel Scherer)


   (Nicolás Ojeda Bär, report by Jocelyn Sérot, review by Gabriel
   Scherer)


   report by Tiphaine Turpin)

 • #2083: Fix excessively aggressive float unboxing and introduce
   similar fix as a preventative measure for boxed int unboxing.
   (Thomas Refis, Mark Shinwell, Leo White)


   by Hugo Heuzard)


   (Alain Frisch, review by Jacques Garrigue)


   review by Gabriel Scherer)

 • #2220: Remove duplicate process management code in

   and Alain Frisch)


   (Thomas Refis and Leo White, review by Gabriel Radanne)


   review by Leo White)


   report by Marc Lasson)

 • #7929, #2261: Subst.signature: call cleanup_types exactly once
   (Thomas Refis, review by Gabriel Scherer and Jacques Garrigue,
   report by Daniel Bünzli and Jon Ludlam)


   Yallop)


Dungeon crawler game
════════════════════

• #1940: Add Option module and Format.pp_print_option `none, some, • #1956: Add Result module and Format.pp_print_result `ok, error, `unwind-protect' in Lisp and `FINALLY' in Modula-2. It is careful about preserving backtraces and treating exceptions in finally as errors. (Marcello Seri and Guillaume Munch-Maccagnoni, review by Daniel Bünzli, Gabriel Scherer, François Bobot, Nicolás Ojeda Bär, Xavier Clerc, Boris Yakobowski, Damien Doligez, and Xavier Leroy) • * #1605: Deprecate Stdlib.Pervasives. Following #1010, Pervasives is • #2185: Add `List.filter_map' (Thomas Refis, review by Alain Frisch • #1957: Add Stack.{top_opt,pop_opt} and Queue.{peek_opt,take_opt}. (Vladimir Keleshev, review by Nicolás Ojeda Bär and Gabriel Scherer) • #1182: Add new Printf formats %#d %#Ld %#ld %#nd (idem for %i and %u) for alternative integer formatting – inserts '_' between blocks • #1986, #6450: Add Set.disjoint (Nicolás Ojeda Bär, review by Gabriel • #7812, #2125: Add Filename.chop_suffix_opt (Alain Frisch, review by • #1864: Extend Bytes and Buffer with functions to read/write binary • #2002: Add Format.pp_print_custom_break, a new more general kind of Keleshev and Pierre Weis, review by Josh Berdine, Gabriel Radanne) • #1794: Add constants zero, one, minus_one and functions succ, pred, min_max_num to module Float. (Christophe Troestler, review by Alain • #1354, #2177: Add fma support to Float module. (Laurent Thévenoux, • #5072, #6655, #1876: add aliases in Stdlib for built-in types and exceptions. (Jeremy Yallop, reports by Pierre Letouzey and David Sheets, review by Valentin Gatien-Baron, Gabriel Scherer and Alain • #1731: Format, use raise_notrace to preserve backtraces. (Frédéric Sivaramakrishnan, review by Gabriel Scherer and François Bobot) • #7235: Format, flush err_formatter at exit. (Pierre Weis, request • #1857, #7812: Remove Sort module, deprecated since 2000 and emitting • #1923: Arg module sometimes misbehaved instead of rejecting invalid • #1959: Small simplification and optimization to Format.ifprintf • #2145: Deprecate the mutability of Gc.control record fields (Damien • #2159, #7874: annotate {String,Bytes}.equal as being [@@noalloc]. • #1936: Add module Float.Array (Damien Doligez, review by Xavier • #2183: Fix segfault in Array.create_float with -no-flat-float-array • #1525: Make function set_max_indent respect documentation (Pierre • #2202: Correct Hashtbl.MakeSeeded.{add_seq,replace_seq,of_seq} to • #2533, #1839, #1949: added Unix.fsync (Francois Berenger, Nicolás • #1792, #7794: Add Unix.open_process_args{,_in,_out,_full} similar to Unix.open_process{,_in,_out,_full}, but passing an explicit argv array. (Nicolás Ojeda Bär, review by Jérémie Dimino, request by • #1999: Add Unix.process{,_in,_out,_full}_pid to retrieve opened • #2222: Set default status in waitpid when pid is zero. Otherwise, status value is undefined. (Romain Beauxis and Xavier Leroy, review Thread.sigmask. This changes the behavior at least on MacOS, where • #1061: Add ?follow parameter to Unix.link. This allows hardlinking symlinks. (Christopher Zimmermann, review by Xavier Leroy, Damien • #2038: Deprecate vm threads. OCaml supported both "native threads", based on pthreads, and its own green-threads implementation, "vm threads". We are not aware of any recent usage of "vm threads", and removing them simplifies further maintenance. (Jérémie Dimino) • * #4208, #4229, #4839, #6462, #6957, #6950, #1063, #2176, 2297: Make #(nat)dynlink sound by correctly failing when dynlinked module names #clash with other modules or interfaces. (Mark Shinwell, Leo White, • #2263: Delete the deprecated Bigarray.*.map_file functions in favour `Unix.map_file' function was introduced in OCaml 4.06.0 onwards. (Jérémie Dimino, reviewed by David Allsopp and Anil Madhavapeddy) • #2096: Add source highlighting for errors & warnings in batch mode • #1720: Improve error reporting for missing 'rec' in let-bindings. (Arthur Charguéraud and Armaël Guéneau, with help and advice from • #7116, #1430: new -config-var option to get the value of a single configuration variable in scripts. (Gabriel Scherer, review by • #1733,1993,1998,2058,2094,2140: Typing error message improvements • #1733, change the perspective of the unexpected existential error • #2058, full explanation for unsafe cycles in recursive module • #7565, #2140, more context for universal variable escape in method (Florian Angeletti, reviews by Jacques Garrique, Armaël Guéneau, • #1913: new flag -dump-into-file to print debug output like -dlambda into a file named after the file being built, instead of on stderr. • #1921: in the compilation context passed to ppx extensions, add more -principal, -alias-deps, -unboxed-types, -unsafe-string (Gabriel Scherer, review by Gabriel Radanne, Xavier Clerc and Frédéric Bour) • #1841, #7808: the environment variable OCAMLTOP_INCLUDE_PATH can now toplevel. (Nicolás Ojeda Bär, request by Daniel Bünzli, review by "open!" statements (Alain Frisch, report by dwang, review by and • #1974: Trigger warning 5 in "let _ = e" and "ignore e" if e is of function type and syntactically an application. (For the case of "ignore e" the warning already existed, but used to be triggered even when e was not an application.) (Nicolás Ojeda Bär, review by • #7408, #7846, #2015: Check arity of primitives. (Hugo Heuzard, • #2091: Add a warning triggered by type declarations "type t = ()" (Armaël Guéneau, report by linse, review by Florian Angeletti and • #2004: Use common standard library path `lib/ocaml' for Windows, for SUPPORTS_SHARED_LIBRARIES from Makefile.config. (David Allsopp, • #6913, #1786: new -match-context-rows option to control the degree of optimization in the pattern matching compiler. (Dwight Guth, • #1822: keep attributes attached to pattern variables from being • #1856, #1869: use `BUILD_PATH_PREFIX_MAP' when compiling primitives `__FILE__' or `__LOC__' (Xavier Clerc, review by Gabriel Scherer and • #1906: the -unsafe option does not apply to marshalled ASTs passed to the compiler directly or by a -pp preprocessor; add a proper • #1925: Print error locations more consistently between batch mode, toplevel and expect tests (Armaël Guéneau, review by Thomas Refis, • #1945, #2032: new "-stop-after [parsing|typing]" option to stop • #1953: Add locations to attributes in the parsetree. (Hugo Heuzard, • #1954: Add locations to toplevel directives. (Hugo Heuzard, review • * #1979: Remove support for TERM=norepeat when displaying errors (Armaël Guéneau, review by Gabriel Scherer and Florian Angeletti) • #1960: The parser keeps previous location when relocating ast node. • #7864, #2109: remove duplicates from spelling suggestions. (Nicolás • #7548: printf example in the tutorial part of the manual (Kostikova Oxana, rewiew by Gabriel Scherer, Florian Angeletti, Marcello Seri (Florian Angeletti, review by Daniel Bünzli, Perry E. Metzger and • #7547, #2273: Tutorial on Lazy expressions and patterns in OCaml Manual (Ulugbek Abdullaev, review by Florian Angeletti and Gabriel • #7720, #1596, precise the documentation of the maximum indentation limit in Format. (Florian Angeletti, review by Richard Bonichon and • #7825: html manual split compilerlibs from stdlib in the html index environment (uses the compiler to check the example code). This • #1788, 1831, 2007, 2198, 2232, move language extensions to the core • #1863: caml-tex2, move to compiler-libs (Florian Angeletti, review • #2105: Change verbatim to caml_example in documentation (Maxime • #2114: ocamldoc, improved manpages for documentation inside modules • #2117: stdlib documentation, duplicate the operator precedence table (Florian Angeletti, review by Daniel Bünzli, Perry E. Metzger and • #2187: document "exception A | pat" patterns (Florian Angeletti, • #1631: AMD64 code generator: emit shorter instruction sequences for the sign-extension operations. (LemonBoy, review by Alain Frisch • #7246, #2146: make a few int64 primitives use [@@unboxed] stubs on • #6242, #2143, #8558, #8559: Optimize some local functions. Local • #2082: New options [-insn-sched] and [-no-insn-sched] to control instruction scheduling. (Mark Shinwell, review by Damien Doligez) • #2239: Fix match miscompilation with flambda (Leo White, review by • #7198, #7750, #1738: add a function (caml_alloc_custom_mem) and out-of-heap memory retained by custom values; use the function to allocate bigarrays and I/O channels. (Damien Doligez, review by • #1793: add the -m and -M command-line options to ocamlrun. Option -m prints the magic number of the bytecode executable passed as (Sébastien Hinderer, review by Xavier Clerc and Damien Doligez) • #1867: Remove the C plugins mechanism. (Xavier Leroy, review by • #8627: Require SSE2 for 32-bit mingw port to generate correct code • #7676, #2144: Remove old GC heuristic (Damien Doligez, report and • #1895: Printexc.get_callstack would return only one frame in native code in threads other then the initial one (Valentin Gatien-Baron, • #1900, #7814: avoid exporting non-prefixed identifiers in the debug no-naked-pointers (Sam Goldman, review by Gabriel Scherer, David • #7829, #8585: Fix pointer comparisons in freelist.c (for 32-bit caml_backtrace_active (Xavier Leroy, review by Mark Shinwell and • #2182: Split Emacs caml-mode as an independent project. (Christophe • #1590: ocamllex-generated lexers can be instructed not to update their lex_curr_p/lex_start_p fields, resulting in a significant performance gain when those fields are not required. (Alain Frisch, • #7843, #2013: ocamldoc, better handling of {{!label}text} in the latex backend. (Florian Angeletti, review by Nicolás Ojeda Bär and • #7844, #2040: Emacs, use built-in detection of comments, fixes an • #7850: Emacs, use symbol boundaries in regular expressions, fixes an • #1711: the new 'open' flag in OCAMLRUNPARAM takes a comma-separated list of modules to open as if they had been passed via the command • #2000: ocamdoc, extended support for "include module type of …" • #2045: ocamlmklib now supports options -args and -args0 to provide extra command-line arguments in a file. (Nicolás Ojeda Bär, review • #2189: change ocamldep Makefile-output to print each dependency on a • #2223: ocamltest: fix the "bsd" and "not-bsd" built-in actions to recognize all BSD variants (Damien Doligez, review by Sébastien options to control (non-)installation of ".byte" executables. (Mark options to control installation of .cmt, .cmti, .mli and .ml files. (Mark Shinwell, review by Nicolás Ojeda Bär and Sébastien Hinderer) • #1781: cleanup of the manual's build process. (steinuil, review by (Sébastien Hinderer, Xavier Leroy and Damien Doligez; review by • #1840: build system enhancements. (Sébastien Hinderer, review by • #1852: merge runtime directories (Sébastien Hinderer, review by • #1854: remove the no longer defined BYTECCCOMPOPTS build variable. alpha​*​-​*​-unicos, powerpc-​*​-aix, ​*​-​*​-solaris2​*​, mips​*​-​*​-irix[56]​*​, (Stephen Dolan, review by Gabriel Scherer and Nicolas Ojeda Bar) • #2264, #7904: the configure script now sets the Unicode handling WINDOWS_UNICODE_MODE. If WINDOWS_UNICODE_MODE is "ansi" then it is WINDOWS_UNICODE_MODE is "compatible" or empty or not set at all, then encoding is UTF-8 with code page fallback. (Nicolás Ojeda Bär, compiler is unable to find the camlheader files (subtle regression • #2295: Restore support for bytecode target XLC/AIX/Power (Konstantin • #7938, #8532: Fix alignment detection for ints on 32-bits platforms • * #8533: Remove some unused configure tests (Stephen Dolan, review • #2207, #8604: Add opam files to allow pinning (Leo White, Greta • #8616: configure: use variables rather than arguments for a few • #8632: Correctly propagate flags for –with-pic in configure. (David • #8673: restore SpaceTime and libunwind support in configure script • #7918, #1703, #1944, #2213, #2257: Add the module Compile_common, which factorizes the common part in Compile and Optcompile. This also makes the pipeline more modular. (Gabriel Radanne, help from Gabriel Scherer and Valentin Gatien-Baron, review by Mark Shinwell Satellite GPRs: #1844, #1846, #1853, #1850, #1934, #2151, #2174 (Gabriel Scherer, Nicolás Ojeda Bär, Frédéric Bour, Thomas Refis and François Pottier, review by Nicolás Ojeda Bär, Leo White and David • #374: use Misc.try_finally for resource cleanup in the compiler codebase. This should fix the problem of catch-and-reraise `try .. with' blocks destroying backtrace information – in the compiler. (François Bobot, help from Gabriel Scherer and Nicolás Ojeda Bär, tools/check-typo script used over the files of the whole repository; contributors are now expected to check that check-typo passes on their pull requests; see CONTRIBUTING.md for more details. (David • #1610, #2252: Remove positions from paths (Leo White, review by • #1745: do not generalize the type of every sub-pattern, only of or-patterns) (Thomas Refis, with help from Leo White, review by • #2317: type_let: be more careful generalizing parts of the pattern • #1747: type_cases: always propagate (preliminary work for GADTs in • #1811: shadow the polymorphic comparison in the middle-end (Xavier • #1833: allow non-val payloads in CMM Ccatch handlers (Simon Fowler, • #1866: document the release process (Damien Doligez and Gabriel Scherer, review by Sébastien Hinderer, Perry E. Metzger, Xavier highlighting several locations (Armaël Guéneau, review by Gabriel • #1905: add check-typo-since to check the files changed since a given • #1938: always check ast invariants after preprocessing (Florian • #1941: refactor the command line parsing of ocamlcp and ocamloptp Stdlib.Queue, and avoid exceptions for control flow. (Vladimir • * #1952: refactor the code responsible for displaying errors and `Location.print_report' instead (Armaël Guéneau, review by Thomas • #7835, #1980, #8548, #8586: separate scope from stamp in idents and explicitly rescope idents when substituting signatures. (Thomas • #1996: expose Pprintast.longident to help compiler-libs users print Longident.t values. (Gabriel Scherer, review by Florian Angeletti • #2030: makefile targets to build AST files of sources for parser testing. See parsing/HACKING.adoc. (Gabriel Scherer, review by • * #2041: add a cache for looking up files in the load path (Jérémie • #2047, #2269: a new type for unification traces (Florian Angeletti, report by Leo White (#2269), review by Thomas Refis and Gabriel • #2055: Add [Linearize.Lprologue]. (Mark Shinwell, review by Pierre • #2056: Use [Backend_var] rather than [Ident] from [Clambda] onwards; use [Backend_var.With_provenance] for variables in binding position. • #2070: "Phantom let" support for the Cmm language. (Mark Shinwell, • #2072: Always associate a scope to a type (Thomas Refis, review by • #2074: Correct naming of record field inside [Ialloc] terms. (Mark [Proc.stack_ptr_dwarf_register_number]. (Mark Shinwell, review by • #2088: Add [Clambda.usymbol_provenance]. (Mark Shinwell, review by • #2156: propagate more type information through Lambda and Clambda optimizations (Pierre Chambart and Alain Frisch, cross-reviewed by • #2160: restore –disable-shared support and ensure testsuite runs correctly when compiled without shared library support. (David • #2100: Fix Unix.getaddrinfo when called on strings containing null bytes; it would crash the GC later on. (Armaël Guéneau, report and (Menhir-generated) parser encountered a syntax error in a certain specific state. (François Pottier, report by Stefan Muenzel, review • #1626: Do not allow recursive modules in `with module' (Leo White, • #7726, #1676: Recursive modules, equi-recursive types and stack overflow (Jacques Garrigue, report by Jeremy Yallop, review by Leo • #7723, #1698: Ensure `with module' and `with type' do not weaken module aliases. (Leo White, review by Gabriel Radanne and Jacques • #1719: fix Pervasives.LargeFile functions under Windows. (Alain • #1739: ensure ocamltest waits for child processes to terminate on • #7554, #1751: Lambda.subst: also update debug event environments description is not suitable for character-oriented I/O, for example if it is a block device or a datagram socket. (Xavier Leroy, review • #7799, #1820: fix bug where Scanf.format_from_string could fail when the argument string contained characters that require escaping. -inline-max-unroll. (Github user @poechsel, review by Nicolás Ojeda • #1890: remove last use of Ctype.unroll_abbrev (Thomas Refis, report • #1893: dev-branch only, warning 40(name not in scope) triggered spurious warnings 49(missing cmi) with -no-alias-deps. (Florian • #1912: Allow quoted strings, octal/unicode escape sequences and identifiers containing apostrophes in ocamllex actions and comments. • #1958: allow [module M(_:S) = struct end] syntax (Hugo Heuzard, • #1970: fix order of floatting documentation comments in classes declarations are no longer ignored. (Nicolás Ojeda Bär, review by • #7830, #1987: fix ocamldebug crash when printing a value in the scope of an `open' statement for which the `.cmi' is not available. • #7854, #2062: fix an issue where the wrong locale may be used when using the legacy ANSI encoding under Windows. (Nicolás Ojeda Bär, • #2130: fix printing of type variables with a quote in their name (Alain Frisch, review by Armaël Guéneau and Gabriel Scherer, report • #2131: fix wrong calls to Env.normalize_path on non-module paths • #2175: Apply substitution to all modules when packing (Leo White, otherlibs/threads/unix.ml (Romain Beauxis, review by Gabriel Scherer • #2231: Env: always freshen persistent signatures before using them • #7851, #8570: Module type of allows to transform a malformed module type into a vicious signature, breaking soundness (Jacques Garrigue, • #7923, #2259: fix regression in FlexDLL bootstrapped build caused by refactoring the root Makefile for Dune in #2093) (David Allsopp, • #8550, #8552: Soundness issue with class generalization (Jacques Garrigue, review by Leo White and Thomas Refis, report by Jeremy Archive: <https://discuss.ocaml.org/t/dungeon-crawler-game/3850/1>

Alex Lugo announced
───────────────────




[here] <https://www.youtube.com/watch?v=De8OH6279qA>

[here] <https://github.com/alugocp/crypts-and-camls>


Jbuilder support will stop in one month
═══════════════════════════════════════

 Archive:
 <https://discuss.ocaml.org/t/jbuilder-support-will-stop-in-one-month/3857/1>


Jérémie Dimino announced
────────────────────────


 consider upgrading to dune and submitting a new opam
 release. Upgrading to Dune can be done automatically via `dune
 upgrade'. For more information, please refer to this blog post:
 <https://dune.build/blog/second-step-deprecation/>


cstruct 5.0.0 with new capability types
═══════════════════════════════════════

 Archive:
 
<https://discuss.ocaml.org/t/ann-cstruct-5-0-0-with-new-capability-types/3862/1>


Anil Madhavapeddy announced
───────────────────────────




 major rev [cstruct 5.0.0] that adds a new module with more

 The full changelog is below:


  be accessed.
 • `sub' does more checks (mirage/ocaml-cstruct#244
   mirage/ocaml-cstruct#245 @hannes @talex5 review by @dinosaure)

   future release. (mirage/ocaml-cstruct#251 @hannes)
 • do not add user-provided data for bounds checks

 • improve CI to add fuzzing (mirage/ocaml-cstruct#255
   mirage/ocaml-cstruct#252 @avsm @yomimono @talex5)


  when using OCaml compilers less than 4.06.0.  This will break
  downstream libraries that do not have a direct dependency on


 *Capability module*: To improve the safety of future code with

  reviewers)


  declaration and so is more robust than polymorphic compare
  (mirage/ocaml-cstruct#248 @emillon)


 runs AFL fuzz tests on the Drone cloud (mirage/ocaml-cstruct#255
 @avsm).


[cstruct 4.0.0]
<https://discuss.ocaml.org/t/cstruct-4-0-0-sexplib-goes-optional/3580>

[cstruct 5.0.0] <https://github.com/mirage/ocaml-cstruct/releases>

[`Cstruct_cap' module]
<https://mirage.github.io/ocaml-cstruct/cstruct/Cstruct_cap/index.html>


Old CWN
═══════


 archives].


 [online].

 [Alan Schmitt]


[send me a message] <mailto:alan.schm...@polytechnique.org>

[the archive] <http://alan.petitepomme.net/cwn/>

Hey all! I recently made a simple text-based dungeon crawler using a mix functional and object-oriented programming in OCaml. Feel free to check it out if it interests you :) I have a video of the game being played and explained [here]. You can find the source on GitHub [here]. This is a reminder that we are planning to stop supporting Jbuilder projects in Dune in July this year, so in about one month time. After this, projects using jbuilder will not be co-installable with the latest version of Dune. If you have a project for which the latest version that is released in opam still depends on jbuilder, you should Cstruct is a library and syntax extension to make it easier to access C-like structures directly from OCaml. It supports both reading and writing to these structures, and they are accessed via `Bigarray'. Hot on the heels of [cstruct 4.0.0], I am pleased to announce another sophisticated types to distinguish between different sorts of buffers. *Security*: This release tightens bounds checks to ensure that data outside a given view (but still inside the underlying buffer) cannot • `add_len' and `set_len' are now deprecated and will be removed in a (mirage/ocaml-cstruct#253 @hannes, report and review by @talex5) *Remove Unix dependency*: cstruct now uses the new `bigarray-compat' library instead of Bigarray directly, to avoid a dependency on Unix `Bigarray'. Simply fix it in your library by adding a `bigarray' dependency in your `dune' file. (mirage/ocaml-cstruct#247 @TheLortex) stronger type checking, this release introduces a new [`Cstruct_cap' module] which makes the underlying Cstruct an abstract type instead of a record. In return for this extra abstraction, the module can enforce read-only, write only, and read/write buffers by tracking them as phantom type variables. Although this library shares an implementation internally with classic `Cstruct', it is a significant revision and so we will be gradually migrating to it. Feedback on it is welcome! (mirage/ocaml-cstruct#237 @dinosaure and many excited *Ppx compare functions*: A new `compare_X' function is generated for `cenum' declarations. This respects custom ids supplied in the cenum The CI has also been switched over to both Azure Pipelines and Drone in addition to Travis, and as a result the tests all run on Windows, macOS, various Linux distributions, on x86 and arm64 machines, and If you happen to miss a CWN, you can [send me a message] and I'll mail it to you, or go take a look at [the archive] or the [RSS feed of the If you also wish to receive it every week by mail, you may subscribe [RSS feed of the archives] <http://alan.petitepomme.net/cwn/cwn.rss>

[online] <http://lists.idyll.org/listinfo/caml-news-weekly/>

[Alan Schmitt] <http://alan.petitepomme.net/>

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