Hello people!

I’ve been testing Elixir 1.9.0 releases and can’t make it work on a very simple project… it is failing with:

Generated <<project>> app
Release <<project>>-0.1.0 already exists. Overwrite? [Yn] Y
* assembling <<project>>-0.1.0 on MIX_ENV=prod
* using config/releases.exs to configure the release at runtime
Cannot read "<<project_root>>/_build/prod/rel/<<Project>>/releases/0.1.0/start.script"
** (MatchError) no match of right hand side value: :error
    (mix) lib/mix/release.ex:433: Mix.Release.make_boot_script/4
    (mix) lib/mix/tasks/release.ex:1063: anonymous fn/5 in Mix.Tasks.Release.make_boot_scripts/3
    (stdlib) maps.erl:257: :maps.fold_1/3
    (mix) lib/mix/tasks/release.ex:1060: Mix.Tasks.Release.make_boot_scripts/3
    (mix) lib/mix/tasks/release.ex:1008: Mix.Tasks.Release.build_rel/2
    (mix) lib/mix/tasks/release.ex:955: Mix.Tasks.Release.assemble/1
    (mix) lib/mix/tasks/release.ex:931: Mix.Tasks.Release.run_steps/1
    (mix) lib/mix/task.ex:331: Mix.Task.run_task/3```

This is a simple Phoenix project without ecto, html or webpack.

Elixir: 1.9.0 (with asdf)
Erlang: 21.3.8 (with asdf)

Nothing configured on mix.exs for releases. Can run project just fine with pure iex iex -S mix but cant generate the release. Run mix release.init just fine but mix release breaks.

The file it says it can’t read is there with readable permissions:

ls -la _build/dev/rel/<<project>>/releases/0.1.0/
total 152
drwxrwxr-x. 2 victorolinasc victorolinasc  4096 jul  3 12:01 .
drwxrwxr-x. 3 victorolinasc victorolinasc  4096 jul  3 12:01 ..
-rw-rw-r--. 1 victorolinasc victorolinasc 57409 jul  3 12:01 start.boot
-rw-rw-r--. 1 victorolinasc victorolinasc  1218 jul  3 12:01 start.rel
-rw-rw-r--. 1 victorolinasc victorolinasc 78962 jul  3 12:01 start.script

Tried to look for the line it says it is breaking (lib/mix/release.ex:433) but on tag 1.9 this line is comment and then not sure how to debug it further down.

Anyone with that problem?