new compiler

mad@New-Haven ~> opam install utop  --use-internal-solver
The following actions will be performed:
  ∗  install conf-m4                 1           [required by ocamlfind]
  ∗  install result                  1.2         [required by lwt]
  ∗  install ocamlbuild              0.11.0      [required by utop]
  ∗  install ocamlfind               1.7.3       [required by utop]
  ∗  install topkg                   0.9.1       [required by react]
  ∗  install jbuilder                1.0+beta14  [required by cppo, lambda-term]
  ∗  install base-bytes              base        [required by cppo]
  ∗  install react                   1.2.1       [required by utop]
  ∗  install ocaml-migrate-parsetree 1.0.7       [required by lwt]
  ∗  install cppo                    1.6.0       [required by utop]
  ∗  install ppx_tools_versioned     5.0.1       [required by lwt]
  ∗  install camomile                0.8.6       [required by zed]
  ∗  install lwt                     3.1.0       [required by utop]
  ∗  install zed                     1.5         [required by lambda-term]
  ∗  install lwt_react               1.1.0       [required by lambda-term]
  ∗  install lambda-term             1.11        [required by utop]
  ∗  install utop                    1.19.3
===== ∗  17 =====
Do you want to continue ? [Y/n] y

=-=- Gathering sources =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
[jbuilder] Archive in cache
[lambda-term] Archive in cache
[lwt] Archive in cache
[lwt_react] Archive in cache
[ocaml-migrate-parsetree] Archive in cache
[ocamlbuild] Archive in cache
[ocamlfind] Archive in cache
[ppx_tools_versioned] Archive in cache
[react] Archive in cache
[result] Archive in cache
[topkg] Archive in cache
[utop] Archive in cache
[zed] Archive in cache
[default] https://opam.ocaml.org/archives/cppo.1.6.0+opam.tar.gz downloaded
[default] https://opam.ocaml.org/archives/camomile.0.8.6+opam.tar.gz downloaded

=-=- Processing actions -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
∗  installed conf-m4.1
∗  installed result.1.2
∗  installed ocamlfind.1.7.3
∗  installed base-bytes.base
∗  installed ocamlbuild.0.11.0
∗  installed jbuilder.1.0+beta14
∗  installed topkg.0.9.1
∗  installed cppo.1.6.0
∗  installed react.1.2.1
∗  installed ocaml-migrate-parsetree.1.0.7
∗  installed camomile.0.8.6
∗  installed ppx_tools_versioned.5.0.1
[ERROR] The compilation of zed failed at "jbuilder build -p zed -j 4".
∗  installed lwt.3.1.0
∗  installed lwt_react.1.1.0

#=== ERROR while installing zed.1.5 ===========================================#
# opam-version 1.2.2
# os           linux
# command      jbuilder build -p zed -j 4
# path         /home/mad/.opam/4.06.0/build/zed.1.5
# compiler     4.06.0
# exit-code    1
# env-file     /home/mad/.opam/4.06.0/build/zed.1.5/zed-10306-5e8320.env
# stdout-file  /home/mad/.opam/4.06.0/build/zed.1.5/zed-10306-5e8320.out
# stderr-file  /home/mad/.opam/4.06.0/build/zed.1.5/zed-10306-5e8320.err
### stderr ###
# Error: This expression has type bytes but an expression was expected of type
# [...]
# (cd _build/default && /home/mad/.opam/4.06.0/bin/ocamlc.opt -w -40 -g -bin-annot -I /home/mad/.opam/4.06.0/lib/bytes -I /home/mad/.opam/4.06.0/lib/camomile -I /home/mad/.opam/4.06.0/lib/ocaml -I /home/mad/.opam/4.06.0/lib/react -no-alias-deps -I src -o src/zed_utf8.cmo -c -impl src/zed_utf8.ml)
# File "src/zed_utf8.ml", line 303, characters 26-29:
# Error: This expression has type bytes but an expression was expected of type
#          string
#       ocamlc src/zed_rope.{cmo,cmt} (exit 2)
# (cd _build/default && /home/mad/.opam/4.06.0/bin/ocamlc.opt -w -40 -g -bin-annot -I /home/mad/.opam/4.06.0/lib/bytes -I /home/mad/.opam/4.06.0/lib/camomile -I /home/mad/.opam/4.06.0/lib/ocaml -I /home/mad/.opam/4.06.0/lib/react -no-alias-deps -I src -o src/zed_rope.cmo -c -impl src/zed_rope.ml)
# File "src/zed_rope.ml", line 541, characters 13-91:
# Error: This expression has type bytes but an expression was expected of type
#          Zed_utf8.t = string



=-=- Error report -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
The following actions were aborted
  ∗  install lambda-term 1.11
  ∗  install utop        1.19.3
The following actions failed
  ∗  install zed 1.5
The following changes have been performed
  ∗  install base-bytes              base
  ∗  install camomile                0.8.6
  ∗  install conf-m4                 1
  ∗  install cppo                    1.6.0
  ∗  install jbuilder                1.0+beta14
  ∗  install lwt                     3.1.0
  ∗  install lwt_react               1.1.0
  ∗  install ocaml-migrate-parsetree 1.0.7
  ∗  install ocamlbuild              0.11.0
  ∗  install ocamlfind               1.7.3
  ∗  install ppx_tools_versioned     5.0.1
  ∗  install react                   1.2.1
  ∗  install result                  1.2
  ∗  install topkg                   0.9.1

=-=- lwt.3.1.0 installed successfully -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
=> Lwt 4.0.0 will make some breaking changes to packaging in late 2017. See
     https://github.com/ocsigen/lwt/issues/453

The former state can be restored with:
    opam switch import "~/.opam/4.06.0/backup/state-20171003211326.export"