2 packages from ocsigen/lwt at 5.8.1

[raphael-proust]

This pull-request concerns:

• lwt.5.8.1: Promises and event-driven I/O
• lwt_ppx.5.8.1: PPX syntax for Lwt, providing something similar to async/await from JavaScript

---

• Homepage: https://github.com/ocsigen/lwt
• Source repo: git+https://github.com/ocsigen/lwt.git
• Bug tracker: https://github.com/ocsigen/lwt/issues

---

🐫 Pull-request generated by opam-publish v2.4.0

[raphael-proust]

do not merge: doesn't seem to fix the issue this release aims to address (ocsigen/lwt#1042)

[raphael-proust]

fixed the issue now

[shonfeder]

Builds seem to be failing with variations of

#=== ERROR while compiling lwt_ppx.5.8.1 ======================================#
# context              2.4.0~alpha1~dev | linux/x86_64 | ocaml-base-compiler.5.2.1 | pinned(https://github.com/ocsigen/lwt/archive/refs/tags/5.8.1.tar.gz)
# path                 ~/.opam/5.2/.opam-switch/build/lwt_ppx.5.8.1
# command              ~/.opam/opam-init/hooks/sandbox.sh build dune build -p lwt_ppx -j 255 @install @runtest
# exit-code            1
# env-file             ~/.opam/log/lwt_ppx-7-016b47.env
# output-file          ~/.opam/log/lwt_ppx-7-016b47.out
### output ###
# (cd _build/default && /home/opam/.opam/5.2/bin/ocamlc.opt -w -40 -warn-error -22 -g -bin-annot -bin-annot-occurrences -I test/ppx/.main.eobjs/byte -I /home/opam/.opam/5.2/lib/bytes -I /home/opam/.opam/5.2/lib/lwt -I /home/opam/.opam/5.2/lib/lwt/unix -I /home/opam/.opam/5.2/lib/ocaml/threads -I /home/opam/.opam/5.2/lib/ocaml/unix -I /home/opam/.opam/5.2/lib/ocplib-endian -I /home/opam/.opam/5.2/lib/ocplib-endian/bigstring -I test/.lwttester.objs/byte -no-alias-deps -o test/ppx/.main.eobjs/byte/dune__exe__Main.cmo -c -impl test/ppx/main.pp.ml)
# File "test/ppx/main.ml", line 9, characters 0-46:
# 9 | let%lwt structure_let_result = Lwt.return_true
#     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# Warning 22 [preprocessor]: let%lwt should not be used at the module item level.
# Replace let%lwt x = e by let x = Lwt_main.run (e)
# (cd _build/default && /home/opam/.opam/5.2/bin/ocamlopt.opt -w -40 -warn-error -22 -g -I test/ppx/.main.eobjs/byte -I test/ppx/.main.eobjs/native -I /home/opam/.opam/5.2/lib/bytes -I /home/opam/.opam/5.2/lib/lwt -I /home/opam/.opam/5.2/lib/lwt/unix -I /home/opam/.opam/5.2/lib/ocaml/threads -I /home/opam/.opam/5.2/lib/ocaml/unix -I /home/opam/.opam/5.2/lib/ocplib-endian -I /home/opam/.opam/5.2/lib/ocplib-endian/bigstring -I test/.lwttester.objs/byte -I test/.lwttester.objs/native -intf-suffix .ml -no-alias-deps -o test/ppx/.main.eobjs/native/dune__exe__Main.cmx -c -impl test/ppx/main.pp.ml)
# File "test/ppx/main.ml", line 9, characters 0-46:
# 9 | let%lwt structure_let_result = Lwt.return_true
#     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# Warning 22 [preprocessor]: let%lwt should not be used at the module item level.
# Replace let%lwt x = e by let x = Lwt_main.run (e)
# (cd _build/default/test/ppx && ./main.exe)
# Testing library 'ppx'...
# ................
# Ok. 16 tests ran, 0 tests skipped in 1.20 seconds
# File "test/unix/dune", line 22, characters 7-11:
# 22 |  (name main)
#             ^^^^
# (cd _build/default/test/unix && ./main.exe)
# Testing library 'unix'...
# .....................................SSSSS..................................................................................................E............SSSSE..................................................................................
# Test 'bytes read' in suite 'lwt_bytes' raised 'Unix.Unix_error(Unix.ENOENT, "open", "bytes_io_data")'
# Test 'map_file' in suite 'lwt_bytes' raised 'Unix.Unix_error(Unix.ENOENT, "open", "bytes_io_data")'