[lower bound] Error compiling tls.0.10.1

[mseri]

The error is

#=== ERROR while compiling tls.0.10.1 =========================================#
# context              2.1.0~rc2 | linux/x86_64 | ocaml-base-compiler.4.03.0 | file:///src
# path                 ~/.opam/4.03/.opam-switch/build/tls.0.10.1
# command              ~/.opam/opam-init/hooks/sandbox.sh build ocaml pkg/pkg.ml build --pinned false --tests false --with-lwt true --with-mirage false
# exit-code            1
# env-file             ~/.opam/log/tls-19-3a3a8d.env
# output-file          ~/.opam/log/tls-19-3a3a8d.out
### output ###
# ocamlfind ocamlopt unix.cmxa -I /home/opam/.opam/4.03/lib/ocamlbuild /home/opam/.opam/4.03/lib/ocamlbuild/ocamlbuildlib.cmxa -linkpkg myocamlbuild.ml /home/opam/.opam/4.03/lib/ocamlbuild/ocamlbuild.cmx -o myocamlbuild
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/tracing.mli > lib/tracing.mli.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/tracing.cmi lib/tracing.mli
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/tracing.cmi lib/tracing.mli
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml/compiler-libs, /home/opam/.opam/4.03/lib/ocaml
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/tracing.ml > lib/tracing.ml.depends
# ocamlfind ocamldep -package ppx_sexp_conv -package 'cstruct nocrypto result x509 sexplib' -modules lib/ciphersuite.ml > lib/ciphersuite.ml.depends
# ocamlfind ocamldep -package ppx_cstruct -package 'cstruct nocrypto result x509 sexplib' -modules lib/packet.ml > lib/packet.ml.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -package ppx_cstruct -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/packet.cmo lib/packet.ml
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -package ppx_cstruct -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/packet.cmo lib/packet.ml
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml/compiler-libs, /home/opam/.opam/4.03/lib/ocaml
# ocamlfind ocamldep -package ppx_sexp_conv -package 'cstruct nocrypto result x509 sexplib' -modules lib/core.ml > lib/core.ml.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -package ppx_sexp_conv -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/ciphersuite.cmo lib/ciphersuite.ml
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -package ppx_sexp_conv -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/ciphersuite.cmo lib/ciphersuite.ml
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml, /home/opam/.opam/4.03/lib/ocaml/compiler-libs
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/reader.mli > lib/reader.mli.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -package ppx_sexp_conv -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/core.cmo lib/core.ml
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -package ppx_sexp_conv -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/core.cmo lib/core.ml
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml, /home/opam/.opam/4.03/lib/ocaml/compiler-libs
# ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/reader.cmi lib/reader.mli
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/reader.cmi lib/reader.mli
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml/compiler-libs, /home/opam/.opam/4.03/lib/ocaml
# ocamlfind ocamldep -package ppx_sexp_conv -package 'cstruct nocrypto result x509 sexplib' -modules lib/reader.ml > lib/reader.ml.depends
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/control.ml > lib/control.ml.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/control.cmo lib/control.ml
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/control.cmo lib/control.ml
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml/compiler-libs, /home/opam/.opam/4.03/lib/ocaml
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/writer.mli > lib/writer.mli.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/writer.cmi lib/writer.mli
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/writer.cmi lib/writer.mli
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml/compiler-libs, /home/opam/.opam/4.03/lib/ocaml
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/writer.ml > lib/writer.ml.depends
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/utils.ml > lib/utils.ml.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/utils.cmo lib/utils.ml
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/utils.cmo lib/utils.ml
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml/compiler-libs, /home/opam/.opam/4.03/lib/ocaml
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/config.mli > lib/config.mli.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/config.cmi lib/config.mli
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/config.cmi lib/config.mli
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml/compiler-libs, /home/opam/.opam/4.03/lib/ocaml
# ocamlfind ocamldep -package ppx_sexp_conv -package 'cstruct nocrypto result x509 sexplib' -modules lib/config.ml > lib/config.ml.depends
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/engine.mli > lib/engine.mli.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/engine.cmi lib/engine.mli
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/engine.cmi lib/engine.mli
# findlib: [WARNING] Interface config.cmi occurs in several directories: lib, /home/opam/.opam/4.03/lib/ocaml/compiler-libs
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml/compiler-libs, /home/opam/.opam/4.03/lib/ocaml
# ocamlfind ocamldep -package ppx_sexp_conv -package 'cstruct nocrypto result x509 sexplib' -modules lib/engine.ml > lib/engine.ml.depends
# ocamlfind ocamldep -package 'cstruct nocrypto result x509 sexplib' -modules lib/crypto.ml > lib/crypto.ml.depends
# ocamlfind ocamldep -package ppx_sexp_conv -package 'cstruct nocrypto result x509 sexplib' -modules lib/state.ml > lib/state.ml.depends
# ocamlfind ocamlc -c -g -bin-annot -safe-string -package ppx_sexp_conv -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/state.cmo lib/state.ml
# + ocamlfind ocamlc -c -g -bin-annot -safe-string -package ppx_sexp_conv -for-pack Tls -package 'cstruct nocrypto result x509 sexplib' -w +A-4-9-41-42-44-45 -color always -I lib -I lwt -o lib/state.cmo lib/state.ml
# findlib: [WARNING] Interface config.cmi occurs in several directories: lib, /home/opam/.opam/4.03/lib/ocaml/compiler-libs
# findlib: [WARNING] Interface topdirs.cmi occurs in several directories: /home/opam/.opam/4.03/lib/ocaml, /home/opam/.opam/4.03/lib/ocaml/compiler-libs
# File "lib/state.ml", line 222, characters 0-14:
# Error: Multiple definition of the type name t.
#        Names must be unique in a given structure or signature.
# Command exited with code 2.
# + ocamlfind ocamlopt unix.cmxa -I /home/opam/.opam/4.03/lib/ocamlbuild /home/opam/.opam/4.03/lib/ocamlbuild/ocamlbuildlib.cmxa -linkpkg myocamlbuild.ml /home/opam/.opam/4.03/lib/ocamlbuild/ocamlbuild.cmx -o myocamlbuild
# File "myocamlbuild.ml", line 4, characters 34-46:
# Warning 40: dependencies was selected from type Ocamlbuild_plugin.Findlib.package.
# It is not visible in the current scope, and will not 
# be selected if the type becomes unknown.
# pkg.ml: [ERROR] cmd ['ocamlbuild' '-use-ocamlfind' '-classic-display' '-j' '4' '-tag' 'debug'
#      '-build-dir' '_build' 'opam' 'pkg/META' 'CHANGES.md' 'LICENSE.md'
#      'README.md' 'lib/tls.cmi' 'lib/tls.a' 'lib/tls.cmxs' 'lib/tls.cmxa'
#      'lib/tls.cma' 'lib/tls.cmx' 'lwt/tls-lwt.a' 'lwt/tls-lwt.cmxs'
#      'lwt/tls-lwt.cmxa' 'lwt/tls-lwt.cma' 'lwt/x509_lwt.cmx'
#      'lwt/x509_lwt.cmi' 'lwt/x509_lwt.mli' 'lwt/tls_lwt.cmx'
#      'lwt/tls_lwt.cmi' 'lwt/tls_lwt.mli']: exited with 10

The packages involved are

The following actions will be performed:
  - install mirage-no-xen           1
  - install conf-gmp                3
  - install mirage-no-solo5         1
  - install conf-m4                 1
  - install conf-perl               1
  - install ocamlbuild              0.14.0
  - install jbuilder                1.0+beta20.2
  - install ocamlfind               1.8.1
  - install zarith                  1.11
  - install topkg                   1.0.3
  - install sexplib                 113.33.00+4.03
  - install ppx_tools               5.0+4.03.0
  - install ocamlfind-secondary     1.8.1
  - install base-bytes              base
  - install ppx_core                113.33.01+4.03
  - install dune                    2.9.0
  - install astring                 0.8.3
  - install ppx_optcomp             113.33.00+4.03
  - install seq                     0.2.2
  - install result                  1.5
  - install ppx_derivers            1.2.1
  - install ocaml-syntax-shims      1.0.0
  - install mmap                    1.1.0
  - install cstruct                 3.7.0
  - install csexp                   1.5.1
  - install cpuid                   0.1.2
  - install cppo                    1.6.7
  - install ocb-stubblr             0.1.1-1
  - install ppx_driver              113.33.02+4.03
  - install ptime                   0.8.5
  - install irc-client              0.6.2
  - install ocaml-migrate-parsetree 1.8.0
  - install dune-configurator       2.9.0
  - install ocplib-endian           1.1
  - install asn1-combinators        0.2.0
  - install ppxfind                 1.4
  - install ppx_tools_versioned     5.4.0
  - install lwt                     5.4.1
  - install ppx_deriving            4.5
  - install ppx_cstruct             3.7.0
  - install cstruct-lwt             3.7.0
  - install ppx_type_conv           113.33.02+4.03
  - install ppx_sexp_conv           113.33.01+4.03
  - install nocrypto                0.5.4-2
  - install x509                    0.6.1
  - install tls                     0.10.1

[mseri]

Seen on #18987