4.05.0 changes explanation

Kakadu edited this page Sep 20, 2017 · 9 revisions

OCaml 4.05.0 (July 13th 2017)

Breaking changes

Type system:

  • PR#7414, GPR#929: Soundness bug with non-generalized type variables and functors. (compatibility: some code using module-global mutable state will fail at compile-time and is fixed by adding extra annotations; see the Mantis and Github discussions.) (Jacques Garrigue, report by Leo White)

Here is an example of code that breaks with 4.05.0, provided by Thierry Martinez:

module type S = sig
  type 'a t = N
  val r: (unit -> unit t) ref

module M = struct
  type 'a t = N
  let r = ref (fun () -> raise Not_found)
end (* works correctly *)

module F (X: S) = struct end
module N = F (M) (* fails to compile *)

In this code, the inferred signature of the module M is as follows:

module M : sig type 'a t = N val r : (unit -> '_a) ref end

The problem is the non-generalizable (weak) type variable '_a: it is not polymorphic but its type cannot be determined at this point. OCaml now reject using modules M with weak variables in functor applications (F(M) here), because applying it several times may unify '_a with different things and be unsound.

To fix this, you should fix the type of the mutable reference r from the start, by using one of the following annotations

module M : S = struct ... end

(* or *)

  let r : (unit -> unit t) ref = ref (fun () -> raise Not_found)

(* or *)

  let r = ref (fun () -> (raise Not_found : unit t))


The function was removed as it was breaking the separation of concerns between the Uchar and Format modules. A better interface is being discussed (see the github issue), but in the meantime you can reimplement the feature yourself, by turning

  UChar.dump ppf c;


  Format.fprintf ppf "U+%04X" u
  • GPR#1088: Gc.minor_words now returns accurate numbers. (Stephen Dolan, review by Pierre Chambart and Xavier Leroy)

The .mli declaration of Gc.minor_words and Gc.get_minor_free changed, which may break libraries re-exporting these values. This probably does not affect most users.

  • PR#7342, GPR#797: fix Unix.read on pipes with no data left on Windows it previously raised an EPIPE error, it now returns 0 like other OSes (Jonathan Protzenko, review by Andreas Hauptmann and Damien Doligez)

The behavior on Windows (that was previously surprising and undocumented and different from the OSX/Linux behavior) was changed to work like on other systems. This may break code that was developed and only tested under Windows, but it will also fix a lot of software that would previously break on Windows.

Other changes

Code generation and optimizations:

  • PR#7201, GPR#954: Correct wrong optimisation of 0 / <expr> and 0 mod <expr> in the case when was a non-constant evaluating to zero (Mark Shinwell, review by Gabriel Scherer, Leo White and Xavier Leroy)

  • PR#7357, GPR#832: Improve compilation time for toplevel include(struct ... end : sig ... end) (Alain Frisch, report by Hongbo Zhang, review by Jacques Garrigue)

  • PR#7533, GPR#1173: Correctly perform side effects for certain cases of "/" and "mod" (Mark Shinwell, report by Jan Mitgaard)

This bug was found by random generation of OCaml programs using a static analysis designed to study evaluation-order differences between the bytecode and native compiler. This work is now explained in an ICFP 2017 paper. Pretty cool!

  • GPR#504: Instrumentation support for fuzzing with afl-fuzz. (Stephen Dolan, review by Alain Frisch, Pierre Chambart, Mark Shinwell, Gabriel Scherer and Damien Doligez)

This feature enables other sort of cool fuzzing-based technique of OCaml programs (not yet explained at ICFP), see the crowbar library and Mindy Preston's blog post Crowbar Your Favorite Library for Fun and Bugfixes. Also pretty cool!

  • GPR#863, GPR#1068, GPR#1069: Optimise matches with constant results to lookup tables. (Stephen Dolan, review by Gabriel Scherer, Pierre Chambart, Mark Shinwell, and bug report by Gabriel Scherer)

  • GPR#1150: Fix typo in arm64 assembler directives (KC Sivaramakrishnan)

Runtime system:

  • PR#385, GPR#953: Add caml_startup_exn (Mark Shinwell)

  • PR#7423, GPR#946: expose new exception-raising functions void caml_{failwith,invalid_argument}_value(value msg) in addition to void caml_{failwith,invalid_argument}(char const *msg). The previous functions would not free their message argument, so were inconvient for dynamically-allocated messages; the messages passed to the new functions are handled by the garbage collector. (Gabriel Scherer, review by Mark Shinwell, request by Immanuel Litzroth)

  • PR#7557, GPR#1213: More security for getenv (Damien Doligez, reports by Seth Arnold and Eric Milliken, review by Xavier Leroy, David Allsopp, Stephen Dolan, Hannes Mehnert)

  • GPR#795: remove 256-character limitation on Sys.executable_name (Xavier Leroy)

  • GPR#891: Use -fno-builtin-memcmp when building runtime with gcc. (Leo White)

Type system:

  • PR#6608, GPR#901: unify record types when overriding all fields (Tadeu Zagallo and Gabriel Scherer, report by Jeremy Yallop, review by David Allsopp, Jacques Garrigue)

Compiler user-interface and warnings:

  • PR#7050, GPR#748 GPR#843 GPR#864: new -args/-args0 <file> parameters to provide extra command-line arguments in a file -- see documentation. User programs may implement similar options using the new Expand constructor of the Arg module. (Bernhard Schommer, review by Jérémie Dimino, Gabriel Scherer and Damien Doligez, discussion with Alain Frisch and Xavier Leroy, feature request from the Coq team)

  • PR#7137, GPR#960: "-open" command line flag now accepts a module path (not a module name) (Arseniy Alekseyev and Leo White)

  • PR#7172, GPR#970: add extra (ocamlc -config) options int_size, word_size, ext_exe (Gabriel Scherer, request by Daniel Bünzli)

  • PR#7315, GPR#736: refine some error locations (Gabriel Scherer and Alain Frisch, report by Matej Košík)

  • PR#7473, GPR#1025: perform proper globbing for command-line arguments on Windows (Jonathan Protzenko)

  • PR#7479: make sure "ocamlc -pack" is only given .cmo and .cmi files, and that "ocamlopt -pack" is only given .cmx and .cmi files. (Xavier Leroy)

  • GPR#796: allow compiler plugins to declare their own arguments. (Fabrice Le Fessant)

  • GPR#829: better error when opening a module aliased to a functor (Alain Frisch)

  • GPR#911: ocamlc/ocamlopt do not pass warnings-related options to C compiler when called to compile third-party C source files (Sébastien Hinderer, review by Adrien Nader and David Allsopp)

  • GPR#915: fix -dsource (pprintast.ml) bugs (Runhang Li, review by Alain Frisch)

  • GPR#933: ocamlopt -p now reports an error on platforms that do not support profiling with gprof; dummy profiling libraries are no longer installed on such platforms. This can be tested with ocamlopt -config (Sébastien Hinderer)
  • GPR#1009: "ocamlc -c -linkall" and "ocamlopt -c -linkall" can now be used to set the "always link" flag on individual compilation units. This controls linking with finer granularity than "-a -linkall", which sets the "always link" flag on all units of the given library. (Xavier Leroy)

  • GPR#1015: add option "-plugin PLUGIN" to ocamldep too. Use compilerlibs to build ocamldep. (Fabrice Le Fessant)

  • GPR#1027: various improvements to -dtimings, mostly including time spent in subprocesses like preprocessors (Valentin Gatien-Baron, review by Gabriel Scherer)

  • GPR#1098: the compiler now takes the boolean "OCAML_COLOR" environment variable into account if "-color" is not provided. This allows users to override the default behaviour without modifying invocations of ocaml manually. (Hannes Mehnert, Guillaume Bury, review by Daniel Bünzli, Gabriel Scherer, Damien Doligez)

Standard library:

  • PR#6975, GPR#902: Truncate function added to stdlib Buffer module (Dhruv Makwana, review by Alain Frisch and Gabriel Scherer)

  • PR#7279, GPR#710: Weak.get_copy Ephemeron.*_copy doesn't copy custom blocks anymore (François Bobot, Alain Frisch, bug reported by Martin R. Neuhäußer, review by Thomas Braibant and Damien Doligez)

  • GPR#760: Add a functions List.compare_lengths and List.compare_length_with to avoid full list length computations (Fabrice Le Fessant, review by Leo White, Josh Berdine and Gabriel Scherer)

  • GPR#778: Arg: added option Expand that allows to expand a string argument to a string array of new arguments (Bernhard Schommer, review by Gabriel Scherer and Jérémie Dimino)

  • GPR#849: Expose a Spacetime.enabled value (Leo White)

  • GPR#885: Option-returning variants of stdlib functions (Alain Frisch, review by David Allsopp and Bart Jacobs)

  • GPR#869: Add find_first, find_first_opt, find_last, find_last_opt to maps and sets. Find the first or last binding or element satisfying a monotonic predicate. (Gabriel de Perthuis, with contributions from Alain Frisch, review by Hezekiah M. Carty and Simon Cruanes, initial report by Gerd Stolpmann)

  • GPR#875: Add missing functions to ArrayLabels, BytesLabels, ListLabels, MoreLabels, StringLabels so they are compatible with non-labeled counterparts. Also add missing @@ocaml.deprecated attributes in StringLabels and BytesLabels. (Roma Sokolov, review by Gabriel Scherer, Jacques Garrigue, Gabriel Radanne, Alain Frisch)

  • GPR#999: Arg, do not repeat the usage message thrice when reporting an error (this was a regression in 4.03) (Florian Angeletti, review by Gabriel Scherer)

  • GPR#1042: Fix escaping of command-line arguments in Unix.create_process{,_env} under Windows. Arguments with tabs should now be received verbatim by the child process. (Nicolas Ojeda Bar, Andreas Hauptmann review by Xavier Leroy)

Debugging and profiling:

  • PR#7258: ocamldebug's "install_printer" command had problems with module aliases (Xavier Leroy)

  • GPR#378: Add [Printexc.raise_with_backtrace] to raise an exception using an explicit backtrace (François Bobot, review by Gabriel Scherer, Xavier Leroy, Damien Doligez, Frédéric Bour)

Consider a program with code looking like the following:

try ...
with exn ->
  report_error ...;
  raise exn

(* or *)

try ...
with exn ->
  report_error ...;
  raise (Internal_error (exn, location_information))

The problem with this style is that catching this exception in the middle and re-raising breaks the backtrace-collection logic of the compiler: if the exception is not caught by the program and you use OCAMLRUNPARAM=b, or if it is caught later by a function trying to print a backtrace (using Printexc.get_backtrace for example), you would only get the part of the trace after the last raise call, and not the original one where the error actually happened.

In the first case, you could sometime fix it by doing the following:

external reraise : exn -> 'a = "%reraise"
try ...
with exn ->
  report_error ...;
  reraise exn

But this does not work if report_error uses exception internally (this happens when you use the Format module typically): you would get the trace of the internal exceptions, except of the original exn raiser.

Now you can do the following instead:

try ...
with exn ->
  let trace = Printexc.get_raw_backtrace in (* before anything else in the handler *)
  report_error ...;
  Printexc.raise_with_backtrace (Internal_error (exn, location_information)) trace

Manual and documentation:

  • PR#6597, GPR#1030: add forward references to language extensions that extend non-terminal symbols in the language reference section. (Florian Angeletti, review by Gabriel Scherer)

  • PR#7497, GPR#1095: manual, enable numbering for table of contents (Florian Angeletti, request by Daniel Bünzli)

  • PR#7539, GPR#1181: manual, update dead links in ocamldoc chapter (Florian Angeletti)

  • GPR#633: manpage and manual documentation for the -opaque option (Konstantin Romanov, Gabriel Scherer, review by Mark Shinwell)

  • GPR#751, GPR#925: add a HACKING.adoc file to contain various tips and tricks for people hacking on the repository. See also CONTRIBUTING.md for advice on sending contributions upstream. (Gabriel Scherer and Gabriel Radanne, review by David Allsopp, inspired by John Whitington)

  • GPR#916: new tool lintapidiff, use it to update the manual with @since annotations for API changes introduced between 4.00-4.05. (Edwin Török, review by Gabriel Scherer, discussion with Alain Frisch, David Allsopp, Sébastien Hinderer, Damien Doligez and Xavier Leroy)

  • GPR#939: activate the caml_example environment in the language extensions section of the manual. Convert some existing code examples to this format. (Florian Angeletti)

  • GPR#1082: clarify that the use of quoted string for preprocessed foreign quotations still requires the use of an extension node [%foo ...] to mark non-standard interpretation. (Gabriel Scherer, request by Matthew Wahab in GPR#1066, review by Florian Angeletti)

Other libraries:

  • PR#7158: Event.sync, Mutex.create, Condition.create cause too many GCs. The fix is to no longer consider mutexes and condition variables as rare kernel resources. (Xavier Leroy)

  • PR#7264: document the different behaviors of Unix.lockf under POSIX and under Win32. (Xavier Leroy, report by David Allsopp)

  • PR#7339, GPR#787: Support the '0 dimension' case for bigarrays (see Bigarray documentation) (Laurent Mazare, review by Gabriel Scherer, Alain Frisch and Hezekiah M. Carty)

  • PR#7342, GPR#797: fix Unix.read on pipes with no data left on Windows it previously raised an EPIPE error, it now returns 0 like other OSes (Jonathan Protzenko, review by Andreas Hauptmann and Damien Doligez)
  • GPR#650: in the Unix library, add ?cloexec:bool optional arguments to functions that create file descriptors (dup, dup2, pipe, socket, socketpair, accept). Implement these optional arguments in the most atomic manner provided by the operating system to set (or clear) the close-on-exec flag at the same time the file descriptor is created, reducing the risk of race conditions with exec or create_process calls running in other threads, and improving security. Also: add a O_KEEPEXEC flag for openfile by symmetry with O_CLOEXEC. (Xavier Leroy, review by Mark Shinwell, David Allsopp and Alain Frisch, request by Romain Beauxis)

  • GPR#996: correctly update caml_top_of_stack in systhreads (Fabrice Le Fessant)


  • PR#7060, GPR#1035: Print exceptions in installed custom printers (Tadeu Zagallo, review by David Allsopp)


  • PR#5163: ocamlobjinfo, dump globals defined by bytecode executables (Stéphane Glondu)

  • PR#7333: ocamldoc, use the first sentence of text file as a short description in overviews. (Florian Angeletti)

  • GPR#848: ocamldoc, escape link targets in HTML output (Etienne Millon, review by Gabriel Scherer, Florian Angeletti and Daniel Bünzli)

  • GPR#986: ocamldoc, use relative paths in error message to solve ocamlbuild+doc usability issue (ocaml/ocamlbuild#79) (Gabriel Scherer, review by Florian Angeletti, discussion with Daniel Bünzli)

  • GPR#1017: ocamldoc, add an option to detect code fragments that could be transformed into a cross-reference to a known element. (Florian Angeletti, review and suggestion by David Allsopp)

  • clarify ocamldoc text parsing error messages (Gabriel Scherer)

Compiler distribution build system:

  • PR#7377: remove -std=gnu99 for newer gcc versions (Damien Doligez, report by ygrek)

  • PR#7452, GPR#1228: tweak GCC options to try to avoid the Skylake/Kaby lake bug (Damien Doligez, review by David Allsopp, Xavier Leroy and Mark Shinwell)

  • GPR#693: fail on unexpected errors or warnings within caml_example environment. (Florian Angeletti)

  • GPR#803: new ocamllex-based tool to extract bytecode compiler opcode information from C headers. (Nicolas Ojeda Bar)

  • GPR#827: install missing mli and cmti files, new make target install-compiler-sources for installation of compiler-libs ml files (Hendrik Tews)

  • GPR#887: allow -with-frame-pointers if clang is used as compiler on Linux (Bernhard Schommer)

  • GPR#898: fix locale-dependence of primitive list order, detected through reproducible-builds.org. (Hannes Mehnert, review by Gabriel Scherer and Ximin Luo)

  • GPR#907: Remove unused variable from the build system (Sébastien Hinderer, review by whitequark, Gabriel Scherer, Adrien Nader)

  • GPR#911: Clarify the use of C compiler related variables in the build system. (Sébastien Hinderer, review by Adrien Nader, Alain Frisch, David Allsopp)

  • GPR#919: use clang as preprocessor assembler if clang is used as compiler (Bernhard Schommer)

  • GPR#927: improve the detection of hashbang support in the configure script (Armaël Guéneau)

  • GPR#932: install ocaml{c,lex}->ocaml{c,lex}.byte symlink correctly when the opt target is built but opt.opt target is not. (whitequark, review by Gabriel Scherer)

  • GPR#935: allow build in Android's termux (ygrek, review by Gabriel Scherer)

  • GPR#984: Fix compilation of compiler distribution when Spacetime enabled (Mark Shinwell)

  • GPR#991: On Windows, fix installation when native compiler is not built (Sébastien Hinderer, review by David Allsopp)

  • GPR#1033: merge Unix and Windows build systems in the root directory (Sébastien Hinderer, review by Damien Doligez and Adrien Nader)

  • GPR#1047: Make .depend files generated for C sources more portable (Sébastien Hinderer, review by Xavier Leroy and David Allsopp)

  • GPR#1076: Simplify ocamlyacc's build system (Sébastien Hinderer, review by David Allsopp)

Compiler distribution build system: Makefile factorization

The compiler distribution build system (the set of Makefiles used to build the compiler distribution) traditionally had separate Makefiles for Unix and Windows, which lead to some amount of duplication and subtle differences and technical debt in general -- for people working on the compiler distribution, but also cross-compilation or porting to new systems. During the 4.05 development period, Sébastien Hinderer worked on harmonizing the build rules and merging the two build systems.

  • Some changes were made to the config/Makefile file which is exported as $(ocamlc -where)/Makefile.config, and on which some advanced users might rely. The changes are as follows:

    • a BYTERUN variable was added that points to the installed ocamlrun
    • the PARTIALLD variable was removed (PACKLD is more complete)
    • the always-empty DLLCCCOMPOPTS was removed
    • the SHARED variable was removed; its value is "shared" or "noshared", which duplicates the existing and more convenient SUPPORTS_SHARED_LIBRARIES variable whose value is "true" or "false".

    Note that Makefile.config may change further in the future and relying on it is a bit fragile. We plan to make ocamlc -config easier to use for scripting purposes, and have a stable interface there. If you rely on Makefile.config, you may want to get in touch with Sébastien Hinderer or participate to PR#7116 (Allow easy retrieval of Makefile.config's values) or PR#7172 (More information in ocamlc -config).

The complete list of changes is listed below.

  • GPR#705: update Makefile.nt so that ocamlnat compiles for non-Cygwin Windows ports. (Sébastien Hinderer, review by Alain Frisch)

  • GPR#729: Make sure ocamlnat is built with a $(EXE) extension, merge rules between Unix and Windows Makefiles (Sébastien Hinderer, review by Alain Frisch)

  • GPR#762: Merge build systems in the yacc/ directory. (Sébastien Hinderer, review by David Allsopp, Alain Frisch)

  • GPR#764: Merge build systems in the debugger/ directory. (Sébastien Hinderer, review by Alain Frisch)

  • GPR#785: Merge build systems in otherlibs/systhreads/ (Sébastien Hinderer, review by Alain Frisch, David Allsopp, testing and regression fix by Jérémie Dimino)

  • GPR#788: Merge build systems in subdirectories of otherlibs/. (Sébastien Hinderer, review by Alain Frisch)

  • GPR#808, GPR#906: Merge Unix and Windows build systems in the ocamldoc/ directory (Sébastien Hinderer, review by Alain Frisch)

  • GPR#812: Merge build systems in the tools/ subdirectory (Sébastien Hinderer, review by Alain Frisch)

  • GPR#866: Merge build systems in the stdlib/ directory (Sébastien Hinderer, review by David Allsopp and Adrien Nader)

  • GPR#941: Merge Unix and Windows build systems in the asmrun/ directory (Sébastien Hinderer, review by Mark Shinwell, Adrien Nader, Xavier Leroy, David Allsopp, Damien Doligez)

  • GPR#981: Merge build systems in the byterun/ directory (Sébastien Hinderer, review by Adrien Nader)

  • GPR#1033, GPR#1048: Merge build systems in the root directory (Sébastien Hinderer, review by Adrien Nader and Damien Doligez, testing and regression fix by Andreas Hauptmann)

Internal/compiler-libs changes:

  • GPR#673: distinguish initialization of block fields from mutation in lambda. (Frédéric Bour, review by Xavier Leroy, Stephen Dolan and Mark Shinwell)

  • GPR#744, GPR#781: fix duplicate self-reference in imported cmi_crcs list in .cmti files + avoid rebuilding cmi_info record when creating .cmti files (Alain Frisch, report by Daniel Bünzli, review by Jérémie Dimino)

  • GPR#881: change Outcometree.out_variant to be more general. Ovar_name of out_ident * out_type list becomes Ovar_type of out_type. (Valentin Gatien-Baron, review by Leo White)

  • GPR#908: refactor PIC-handling in the s390x backend (Gabriel Scherer, review by Xavier Leroy and Mark Shinwell)

Bug fixes

  • PR#5115: protect all byterun/fail.c functions against uninitialized caml_global_data (only changes the bytecode behavior) (Gabriel Scherer, review by Xavier Leroy)

  • PR#6136, GPR#967: Fix Closure so that overapplication evaluation order matches the bytecode compiler and Flambda. (Mark Shinwell, report by Jeremy Yallop, review by Frédéric Bour)

  • PR#6550, GPR#1094: Allow creation of empty .cmxa files on macOS (Mark Shinwell)

  • PR#6594, GPR#955: Remove "Istore_symbol" specific operation on x86-64. This is more robust and in particular avoids assembly failures on Win64. (Mark Shinwell, review by Xavier Leroy, testing by David Allsopp and Olivier Andrieu)

  • PR#6903: Unix.execvpe doesn't change environment on Cygwin (Xavier Leroy, report by Adrien Nader)

  • PR#6987: Strange error message probably caused by universal variable escape (with polymorphic variants) (Jacques Garrigue, report by Mikhail Mandrykin and Leo White)

  • PR#7216, GPR#949: don't require double parens in Functor((val x)) (Jacques Garrigue, review by Valentin Gatien-Baron)

  • PR#7331: ocamldoc, avoid infinite loop in presence of self alias, i.e. module rec M:sig end = M (Florian Angeletti, review Gabriel Scherer)

  • PR#7346, GPR#966: Fix evaluation order problem whereby expressions could be incorrectly re-ordered when compiling with Flambda. This also fixes one example of evaluation order in the native code compiler not matching the bytecode compiler (even when not using Flambda) (Mark Shinwell, Leo White, code review by Pierre Chambart)

  • PR#7348: Private row variables can escape their scope (Jacques Garrigue, report by Leo White)

  • PR#7407: Two not-quite-standard C idioms rejected by SUNWSPro compilers (Xavier Leroy)

  • PR#7421: Soundness bug with GADTs and lazy (Jacques Garrigue, report by Leo White)

  • PR#7424: Typechecker diverges on unboxed type declaration (Jacques Garrigue, report by Stephen Dolan)

  • PR#7426, GPR#965: Fix fatal error during object compilation (also introduces new [Pfield_computed] and [Psetfield_computed] primitives) (Mark Shinwell, report by Ulrich Singer)

  • PR#7427, GPR#959: Don't delete let bodies in Cmmgen (Mark Shinwell, report by Valentin Gatien-Baron)

  • PR#7432: Linking modules compiled with -labels and -nolabels is not safe (Jacques Garrigue, report by Jeremy Yallop)

  • PR#7437: typing assert failure with nonrec priv (Jacques Garrigue, report by Anil Madhavapeddy)

  • PR#7438: warning +34 exposes #row with private types (Alain Frisch, report by Anil Madhavapeddy)

  • PR#7443, GPR#990: spurious unused open warning with local open in patterns (Florian Angeletti, report by Gabriel Scherer)

  • PR#7456, GPR#1092: fix slow compilation on source files containing a lot of similar debugging information location entries (Mark Shinwell)

  • PR#7504: fix warning 8 with unconstrained records (Florian Angeletti, report by John Whitington)

  • PR#7511, GPR#1133: Unboxed type with unboxed argument should not be accepted (Damien Doligez, review by Jeremy Yallop and Leo White)

  • GPR#795: remove 256-character limitation on Sys.executable_name (Xavier Leroy)

  • GPR#805, GPR#815, GPR#833: check for integer overflow in String.concat (Jeremy Yallop, review by Damien Doligez, Alain Frisch, Daniel Bünzli, Fabrice Le Fessant)

  • GPR#881: short-paths did not apply to some polymorphic variants (Valentin Gatien-Baron, review by Leo White)

  • GPR#886: Fix Ctype.moregeneral's handling of row_name (Leo White, review by Jacques Garrigue)

  • GPR#934: check for integer overflow in Bytes.extend (Jeremy Yallop, review by Gabriel Scherer)

  • GPR#956: Keep possibly-effectful expressions when optimizing multiplication by zero. (Jeremy Yallop, review by Nicolás Ojeda Bär, Xavier Leroy and Mark Shinwell)

  • GPR#977: Catch Out_of_range in ocamldebug's "list" command (Yunxing Dai)

  • GPR#983: Avoid removing effectful expressions in Closure, and eliminate more non-effectful ones (Alain Frisch, review by Mark Shinwell and Gabriel Scherer)

  • GPR#987: alloc_sockaddr: don't assume a null terminator. It is not inserted on macOS by system calls that fill in a struct sockaddr (e.g. getsockname). (Anton Bachin)

  • GPR#998: Do not delete unused closures in un_anf.ml. (Leo White, review by Mark Shinwell and Pierre Chambart)

  • GPR#1019: Fix fatal error in Flambda mode "[functions] does not map set of closures ID" (Pierre Chambart, code review by Mark Shinwell and Leo White)

  • GPR#1075: Ensure that zero-sized float arrays have zero tags. (Mark Shinwell, Leo White, review by Xavier Leroy)

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