[Caml-list] First release candidate for OCaml 5.3.0

[Caml-list] First release candidate for OCaml 5.3.0

[Florian Angeletti]

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Dear OCaml users, 

The release of OCaml 5.3.0 is imminent. 

As a final step, we are publishing a release candidate to check that everything 
is in order before the release in the upcoming week(s). 

If you find any bugs, please report them on the OCaml's issue 
tracker ( [ https://github.com/ocaml/ocaml/issues | https://github.com/ocaml/ocaml/issues ] ). 

Compared to the second beta, this release candidate contains a regression fix in 
the type system (some type expressions were not generalized when they ought to 
be), one fix for the new check for dependency order at link time, and an 
improvement of the reference manual. 

The full change log for OCaml 5.3.0 is available on 
GitHub(https://github.com/ocaml/ocaml/blob/5.3/Changes). 

A short summary of the changes since the second beta release is also available 
below. 

Happy hacking, 
Florian Angeletti for the OCaml team. 

Installation instructions 
-------------------------------- 

The base compiler can be installed as an opam switch with the following commands on opam 2.1 and later: 

opam update 
opam switch create 5.3.0~rc1 

The source code for the release candidate is also directly available on: 

* GitHub: https://github.com/ocaml/ocaml/archive/5.3.0-rc1.tar.gz 
* OCaml archives at Inria: https://caml.inria.fr/pub/distrib/ocaml-5.3/ocaml-5.3.0~rc1.tar.gz 

Fine-tuned compiler configuration 
--------------------------------------------- 

If you want to tweak the configuration of the compiler, you can switch to the option variant with: 

opam update 
opam switch create <switch_name> ocaml-variants.5.3.0~rc1+options <option_list> 

where `<option_list>` is a space-separated list of `ocaml-option-*` packages. For instance, for a `flambda` and `no-flat-float-array` switch: 

opam switch create 5.3.0~rc1+flambda+nffa ocaml-variants.5.3.0~rc1+options ocaml-option-flambda ocaml-option-no-flat-float-array 


All available options can be listed with `opam search ocaml-option`. 

Changes since the second beta 
----------------------------------------- 

## Type system 

- [#13690](https://github.com/ocaml/ocaml/issues/13690): some type expressions were incorrectly not generalized (because they 
were assigned to the wrong level pool) 

## Compiler user-interface and warnings: 

- [#12084](https://github.com/ocaml/ocaml/issues/12084), +[#13669](https://github.com/ocaml/ocaml/issues/13669), +[#13673](https://github.com/ocaml/ocaml/issues/13673): 
Check link order when creating archive and when using ocamlopt. 

## Documentation 

- [#13666](https://github.com/ocaml/ocaml/issues/13666): Rewrite parts of the example code around nested lists in Chapter 6 
(Polymorphism and its limitations -> Polymorphic recursion) giving the 
"depth" function [in the non-polymorphically-recursive part of the example] 
a much more sensible behavior; also fix a typo and some formatting. 
(Frank Steffahn, review by Florian Angeletti) 

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