That seems to have succeeded. Thank you, I will further investigate it.
josevalim
Creator of Elixir
Eiji
To easy reproduce this issue:
- Install
Erlang26 RC2 and compileElixirmain branch (I did that right before first reply) - Create a test script with only
Mix.installcall and simply run it
$ asdf current
elixir ref:main $HOME/.tool-versions
erlang 26.0-rc2 $HOME/.tool-versions
$ cat test.exs
Mix.install [:cowboy]
$ elixir test.exs
Resolving Hex dependencies...
Resolution completed in 0.152s
New:
cowboy 2.9.0
cowlib 2.11.0
ranch 1.8.0
* Getting cowboy (Hex package)
* Getting cowlib (Hex package)
* Getting ranch (Hex package)
You have added/upgraded packages you could sponsor, run `mix hex.sponsor` to learn more
===> Analyzing applications...
===> Compiling ranch
===> Analyzing applications...
===> Compiling cowlib
===> Compiling src/cow_sse.erl failed
src/cow_sse.erl:56:29: type variable 'State' is only used once (is unbound)
** (Mix.Error) Could not compile dependency :cowlib, "$HOME/.asdf/installs/elixir/ref-main/.mix/elixir/1-15/rebar3 bare compile --paths $HOME/.cache/mix/installs/elixir-1.15.0-dev-erts-14.0/6c3f4dbc449833fbf9e38467f547f6c8/_build/dev/lib/*/ebin" command failed. Errors may have been logged above. You may run Mix.install/2 to try again or change the arguments to Mix.install/2 to try another version
(mix 1.15.0-dev) lib/mix.ex:538: Mix.raise/2
(mix 1.15.0-dev) lib/mix/tasks/deps.compile.ex:310: Mix.Tasks.Deps.Compile.do_command/5
(mix 1.15.0-dev) lib/mix/tasks/deps.compile.ex:220: Mix.Tasks.Deps.Compile.do_rebar3/2
(mix 1.15.0-dev) lib/mix/tasks/deps.compile.ex:96: anonymous fn/4 in Mix.Tasks.Deps.Compile.compile/2
(elixir 1.15.0-dev) lib/enum.ex:1685: Enum."-map/2-lists^map/1-0-"/2
(elixir 1.15.0-dev) lib/enum.ex:1685: Enum."-map/2-lists^map/1-0-"/2
(mix 1.15.0-dev) lib/mix/tasks/deps.compile.ex:80: Mix.Tasks.Deps.Compile.compile/2
(mix 1.15.0-dev) lib/mix/tasks/deps.loadpaths.ex:82: Mix.Tasks.Deps.Loadpaths.deps_check/2
0
CharlesO
josevalim
Creator of Elixir
Perfect, thank you. It may also be a rebar issue, so we will have to investigate on that end as well.
0
Eiji
Unfortunately I know rebar only from name. 
Can we debug what commands were executed like in make all output?
0
Eiji
I have tested all combinations of v1.14.4 and main branch with RC1 and RC2 … Both Elixir versions behave same on specific RC version.
On RC1 I got a Segmentation fault when testing elixir app (ex_unit).
On RC2 I have issue as in above comments (Elixir compiles without any problem).
0
josevalim
Creator of Elixir
The root cause is the following:
-
Erlang/OTP 26 added new linting errors to detect previously invalid (but not warned) typespecs: dialyzer: fix singleton type var in union types by kikofernandez · Pull Request #6864 · erlang/otp · GitHub
-
cowlib was affected by this. A new version (2.9.1) was released but Cowboy depends on cowlib (2.9.0)
For now, you can either forcibly bump cowlib by declaring 2.9.1 with override or wait until there is a new cowboy version out. I have also asked the Erlang/OTP team if it can be a warning for now.
6
CharlesO
With OTP 26 just released, I tried compiling an existing project that worked fine on OTP 25.2.3 / Elixir 1.14.4
The compile hangs…
C:\Projects\pca
λ mix deps.get
Resolving Hex dependencies…
Resolution completed in 0.083s
Unchanged:
castore 1.0.2
certifi 2.9.0
db_connection 2.5.0
decimal 2.1.1
excoding 0.1.5
fs 6.12.0
gen_smtp 1.2.0
hackney 1.18.1
idna 6.1.1
jason 1.4.0
metrics 1.0.1
mime 2.0.3
mimerl 1.2.0
mix_rebar3 0.2.0
parse_trans 3.3.1
pdf_generator 0.6.2
ranch 2.1.0
rustler 0.28.0
rustler_precompiled 0.6.1
ssl_verify_fun 1.1.6
telemetry 1.2.1
tesla 1.7.0
toml 0.7.0
unicode_util_compat 0.7.0
C:\Projects\pca
λ mix compile --force
==> decimal
Compiling 4 files (.ex)
Generated decimal app
0
josevalim
Creator of Elixir
We found a bug that makes Elixir hang when shelled out on Windows. Are you running on Windows? If so, you will need to wait until v1.14.5. 
3