Elixir v1.10.0 released

Release: https://github.com/elixir-lang/elixir/releases/tag/v1.10.0

Support for Erlang/OTP 21+

Elixir v1.10 requires Erlang/OTP 21+, allowing Elixir to integrate with Erlang/OTP’s new logger. Currently, this means that the logger level, logger metadata, as well as all log messages are now shared between Erlang and Elixir APIs.

We will continue improving the relationship between the logging systems in future releases. In particular, we plan to expose all log levels and runtime filtering functionalities available in Erlang directly into Elixir in the next Elixir version.

This release also adds two new guards, is_struct/1 and is_map_key/2, thanks to the strict requirement on Erlang/OTP 21+.

Releases improvements

Elixir v1.9 introduced releases as a mechanism to package self-contained applications. Elixir v1.10 further improves releases with bug fixes and new enhancements based on feedback we got from the community. The highlights are:

  • Allow the dual boot system of releases to be disabled on environments that are boot-time sensitive, such as embedded devices

  • Track and raise if compile-time configuration is set or changes at runtime (more in the next section)

  • Support for easily adding extra files to releases via overlays

  • Allow RELEASE_DISTRIBUTION to be set to none in order to fully disable it

  • Add a built-in :tar step that automatically packages releases

See the full CHANGELOG for more improvements.

Improvements to sort-based APIs in Enum

Enum.sort/1 in Elixir by default sorts from lowest to highest:

iex> Enum.sort(["banana", "apple", "pineapple"])
["apple", "banana", "pineapple"]

If you want to sort from highest to lowest, you need to call Enum.sort/2 with a custom sorting function, such as Enum.sort(collection, &>=/2), which is not immediately obvious to someone reading the code:

iex> Enum.sort(["banana", "apple", "pineapple"], &>=/2)
["pineapple", "banana", "apple"]

Furthermore, comparison operators, such as <= and >=, perform structural sorting, instead of a semantic one. For example, using >= to sort dates descendingly won’t yield the correct result:

iex> Enum.sort([~D[2019-12-31], ~D[2020-01-01]])
[~D[2020-01-01], ~D[2019-12-31]]

To perform proper semantic comparison for dates, one would also need to pass a custom sorting function:

iex> Enum.sort([~D[2019-12-31], ~D[2020-01-01]], &(Date.compare(&1, &2) != :lt))
[~D[2019-12-31], ~D[2020-01-01]]

Elixir v1.10 streamlines the sorting functions by introducing both :asc and :desc shortcuts:

iex> Enum.sort(["banana", "apple", "pineapple"], :asc)
["apple", "banana", "pineapple"]
iex> Enum.sort(["banana", "apple", "pineapple"], :desc)
["pineapple", "banana", "apple"]

As well as adding the possibility to pass a module to perform semantic comparisons. For example, to sort dates, one now only needs to pass the Date module or even {:desc, Date} for descending semantical sort:

iex> Enum.sort([~D[2019-12-31], ~D[2020-01-01]], Date)
[~D[2019-12-31], ~D[2020-01-01]]
iex> Enum.sort([~D[2019-12-31], ~D[2020-01-01]], {:desc, Date})
[~D[2020-01-01], ~D[2019-12-31]]

These API improvements make the code more concise and readable and they have also been added to Enum.sort_by, Enum.min_by, Enum.max_by, and friends.

Tracking of compile-time configuration

In Elixir, we organize our code in applications. Libraries, your dependencies, and your own project are all separate applications. All applications in Elixir also come with an application environment.

The application environment is a key-value store that allows us to configure said application. While reading the application environment at runtime is the preferred approach, in some rare occasions you may want to use the application environment to configure the compilation of a certain project. This is often done by calling Application.get_env/3 outside of a function:

defmodule MyApp.DBClient do
  @db_host Application.get_env(:my_app, :db_host, "db.local")
  def start_link() do
    SomeLib.DBClient.start_link(host: @db_host)

This approach has one big limitation: if you change the value of the application environment after the code is compiled, the value used at runtime is not going to change! For example, if you are using mix release and your config/releases.exs has:

config :my_app, :db_host, "db.production"

Because config/releases.exs is read after the code is compiled, the new value will have no effect as the code was compiled to connect to “db.local”.

Of course, the obvious solution to this mismatch is to not read the application environment at compilation time in the first place, and instead move the code to inside a function:

defmodule MyApp.DBClient do
  def start_link() do
    SomeLib.DBClient.start_link(host: db_host())
  defp db_host() do
    Application.get_env(:my_app, :db_host, "db.local")

While this is the preferred approach, there are still two scenarios we need to address:

  1. Not everyone may be aware of this pitfall, so they will mistakenly read the application environemnt at compile-time, until they are bitten by this behaviour

  2. In rare occasions, you trully need to read the application environment at compile-time, and you want to be warned when you try to configure at runtime something that is valid only at compilation time

Elixir v1.10 aims to solve these two scenarios by introducing a Application.compile_env/3 function. For example, to read the value at compile time, you can now do:

@db_host Application.compile_env(:my_app, :db_host, "db.local")

By using compile_env/3, Elixir will store the values used during compilation and compare them with the runtime values whenever your system starts, raising an error in case they differ. This helps developers ensure they are running their production systems with the configuration they intend to.

In future versions, we will deprecate the use Application.get_env at compile-time with a clear message pointing users to configuration best practices, effectively addressing the scenario where users read from the application environment at compile time unaware of its pitfalls.

Compiler tracing

This release brings enhancements to the Elixir compiler and adds new capabilities for developers to listen to compilation events.

In previous Elixir versions, Elixir would compile a database of cross references between modules (such as function calls, references, structs, etc) for each project in order to perform all kinds of checks, such as deprecations and undefined functions.

Although this database was not public, developers would still use it to run their own checks against their projects. With time, developers would request more data to be included in the database, which was problematic as Elixir itself did not have a use for the additional data, and the database was not meant to be used externally in the first place.

In Elixir v1.10, we have addressed these problems by introducing compiler tracing. The compiler tracing allows developers to listen to events as they are emitted by the compiler, so they can store all of the information they need - and only the information they need.

Elixir itself is using the new compiler tracing to provide new functionality. One advantage of this approach is that developers can now disable undefined function warnings directly on the callsite. For example, imagine you have an optional dependency which may not be available in some cases. You can tell the compiler to skip warning on calls to optional modules with:

@compile {:no_warn_undefined, OptionalDependency}
defdelegate my_function_call(arg), to: OptionalDependency

Previously, this information had to be added to the overall project configuration, which was far away from where the optional call effectively happened.

Other enhancements

Elixir’s calendar data types got many improvements, such as sigil support for third-party calendars, as well as the additions of DateTime.now!/2, DateTime.shift_zone!/3, and NaiveDateTime.local_now/0.

There are many improvements related to Elixir’s AST in this release too. First of all, Code.string_to_quoted/2 has two new options, :token_metadata and :literal_encoder, that give more control over Elixir’s parser. This information was already available to the Elixir code formatter and has now been made public. We have also extensively documented all of Elixir’s AST metadata. These changes alongside compiler tracing means static analyzers and IDE integrations have a better foundation to analyze the source code.

ExUnit, our test framework, ships two small but important improvements: ExUnit.CaptureIO can now be used by tests that run concurrently and we have added “pattern-matching diffing”. To understand the last feature, take this code:

assert %{"status" => 200, "body" => %{"key" => "foo"}} = json_payload

Now imagine that json_payload is a large JSON blob and the "key" inside the "body" did not have value of "foo". In previous Elixir versions, if the assertion failed, Elixir would print the right side and let you up to your own devices to figure out what went wrong. In Elixir v1.10, we diff the data structure against the pattern so you can see exactly which parts of the data matched the pattern and which ones did not. Note ExUnit already performed diffing when comparing data types, this new version adds diffing when matching data agaainst a pattern.


1. Enhancements


  • [Application] Add Application.compile_env/3 and Application.compile_env!/2 for reading values at compilation time and tracking if they accidentally change during runtime
  • [Calendar] Allow custom calendar representations in calendar sigils
  • [Calendar] Add c:Calendar.parse_time/1, c:Calendar.parse_date/1, c:Calendar.parse_naive_datetime/1 and c:Calendar.parse_utc_datetime/1 callbacks to calendar behaviour
  • [CLI] Add support for NO_COLOR environment variable
  • [Code] Add :token_metadata and :literal_encoder support to Code.string_to_quoted/2
  • [Code] Add compiler tracing to lift events done by the compiler
  • [Code] Return {:error, :unavailable} in Code.ensure_compiled/1 if module is in a deadlock
  • [DateTime] Add DateTime.now!/2 and DateTime.shift_zone!/3
  • [Enum] Speed up getting one random element from enumerables
  • [Enum] Add Enum.frequencies/1, Enum.frequencies_by/2, and Enum.map_intersperse/2
  • [Enum] Allow a sorting function on Enum.min/max/min_by/max_by
  • [Enum] Add asc/desc and compare/1 support to Enum.sort/2
  • [Exception] Add version alongside app names in stacktraces
  • [Function] Add Function.identity/1
  • [Kernel] Add Kernel.is_struct/1 and Kernel.is_map_key/2
  • [Kernel] Warn when function head comes immediately after the implementation instead of before the implementation
  • [Kernel] Warn if duplicate key is found in struct declaration
  • [Kernel] Print all undefined functions as warnings and then raise. This allows users to see all undefined calls at once, when it would otherwise require them to compile the code multiple times
  • [Keyword] Add Keyword.pop!/2 and Keyword.pop_values/2
  • [Map] Add Map.pop!/2
  • [MapSet] Optimize multiple operations
  • [Module] Add Module.has_attribute?/2
  • [Module] Add @compile {:no_warn_undefined, mfa_or_module} to turn off undefined function warnings
  • [NaiveDateTime] Add NaiveDateTime.local_now/0
  • [Record] Warn if duplicate key is found in record declaration
  • [String] Update to Unicode 12.1
  • [StringIO] Add :encoding option to StringIO and optimize get_chars operation


  • [ExUnit.Assertions] Support diffs in pattern matching and in assert_receive
  • [ExUnit.CaptureIO] Supports capturing named devices in asynchronous tests


  • [IEx] Warn on circular file imports when loading default .iex.exs
  • [IEx] Allow customization of the continuation prompt on IEx


  • [Logger] Allow start_options to be configured on Logger’s GenEvent
  • [Logger] Integrate Elixir’s Logger with Erlang/OTP 21+'s logger. This means setting up the logger level in Elixir will automatically change the logger level for Erlang and vice-versa


  • [mix compile] Add --profile time flag to profile compilation steps
  • [mix deps.compile] Add --skip-umbrella-children flag. The new flag does not compile umbrella apps. This is useful for building caches in CD/CI pipelines
  • [mix deps.unlock] Add --check-unused flag. The new flag raises if there are any unused dependencies in the lock file
  • [mix release] Allow RELEASE_DISTRIBUTION to be set to none
  • [mix release] Support overlays in rel/overlays
  • [mix release] Allow configuration reboot to be disabled in releases
  • [mix test] Add support for simple round-robin test partitioning across multiple machines
  • [Mix.Project] Add MIX_DEPS_PATH environment variable for setting :deps_path
  • [Mix.Project] Add Mix.Project.deps_scms/1 that returns deps with their SCMs
  • [Mix.Task] Add Mix.Task.Compiler.after_compiler/2 callback, to simplify compilers that may need to run something at multiple steps

2. Bug fixes


  • [EEx] Ensure multiline do/end with no spaces compile under trim mode


  • [Enum] Allow positive range slices on infinite streams given to Enum.slice/2
  • [Kernel] Raise error on functions/guards without implementation
  • [Keyword] Ensure keyword replace and update preserve order
  • [Module] Raise instead of silently failing when performing a write module operation during after-compile
  • [Module] Fix @macrocallback definitions with a when clause
  • [Path] Fix Path.absname/1 to correctly handle UNC paths on Windows
  • [Stream] Close with correct accumulator in Stream.resource/3 when called for a single-element list
  • [Stream] Allow Stream.cycle/1 to be double nested inside Stream.cycle/1
  • [URI] Preserve slashes in URIs without authority
  • [URI] Require a nil or an absolute path on URIs with host or authority


  • [IEx] Exit IEx session if the group leader exits
  • [IEx] Allow pry to be used in non-tty terminals


  • [mix compile] Do not filter out warning for external files from diagnostics
  • [Mix.Project] Ensure user given :manager to dependencies has higher precedence than the SCM one
  • [Mix.Project] Recompile umbrella children when config files change and mix compile is called from the umbrella root
  • [Mix.Task] Always recompile before running tasks from dependencies
  • [Mix.Task] Ensure project’s Logger config is used when running Mix tasks

3. Soft-deprecations (no warnings emitted)


  • [Code] compiler_options/0 is deprecated in favor of compiler_option/1


  • [Mix.Config] Mix.Config.persist/1 has been deprecated. Instead of Mix.Config.persist(config) use Application.put_all_env(config, persistent: true) (Application.put_all_env/2 was added in v1.9)
  • [mix xref] calls/0 is deprecated in favor of compiler tracer
  • [mix xref] The xref.exclude option has been moved to elixirc_options.no_warn_undefined as the xref pass has been moved into the compiler

4. Hard-deprecations


  • [Code] Code.load_file/2 has been deprecated in favor of Code.require_file/2 or Code.compile_file/2
  • [Code] Code.loaded_files/0 and Code.unload_file/1 have been deprecated in favor of Code.required_files/0 and Code.unrequire_file/1 respectively
  • [Code] Code.ensure_compiled?/1 is deprecated in favor of Code.ensure_compiled/1
  • [String] String.normalize/2 has been deprecated in favor of :unicode.characters_to_nfc_binary/1 or :unicode.characters_to_nfd_binary/1 which ship as part of Erlang/OTP 20+
  • [Supervisor] Supervisor.Spec.supervise/2 has been deprecated in favor of the new Supervisor child specification
  • [Supervisor] The :simple_one_for_one strategy in Supervisor has been deprecated in favor of DynamicSupervisor


  • [Logger] :compile_time_purge_level application environment configuration has been deprecated in favor of the more general :compile_time_purge_matching config
  • [Logger] Deprecate logging non-chardata values


  • [mix compile.xref] This check has been moved into the compiler and has no effect now
  • [mix xref deprecations] This check has been moved into the compiler and has no effect now
  • [mix xref unreachable] This check has been moved into the compiler and has no effect now


  • Precompiled.zip SHA1: 0c3f2206131f6d50f9b4e3264dcb8757c52294e4
  • Precompiled.zip SHA512: 1e9286391281cd53e5cc5452cdf9ee586c50648800701a1ab80ef7a5a4ef4052f75149235ba348e560d8d5247a0f476c27f481f53e05cbe29244d0b1a25d6586
  • Docs.zip SHA1: 680895b1926620bbb65e31f81453a9ed64fa3726
  • Docs.zip SHA512: 506751559eebadd439ca8c5b7e7f3d90db913dab7589b81f1d2d4b422c1a822d5c55f719fa785b45c05fb68cc192482d6227d8444c710103d1523c76532f44b6

Have fun!


Thank you for the brand new release!

But could it please be tagged as v1.10.0 on github rather than v1.10 to be tagged the same way as preview releases and also to be available through a three component version from bob?

The current 1.10 is confusing, especially once 1.10.1 comes out, downloading 1.10 and actually getting 1.10.0 might be confusing, as one is used to the convention that two component version refer to the latest release (therefore usually 1.10 implies ~> 1.10.0 when people are talking about “loose” versions)


I only see a 1.10.0 tag on github.

For all the people using asdf. You can look at http://bobs-list.kobrakai.de/ to see if the new version is already built. Currently is looks like the rc is still the most recent build available.


I am not sure what you are referring to. It is tagged as v1.10.0, as you can see here: https://github.com/elixir-lang/elixir/tree/v1.10.0

There is also a branch, v1.10, as we keep for every minor branch too.


Yeah… My browser cutoff some pixels from various places. Sorry for the noise…

After restarting the PC everything renders fine again. I think this was a fontissue at the end…


Bom dia! :slight_smile:

Are we gonna have in hex builds a v1.10.0 too, as in v1.9.0? https://repo.hex.pm/builds/elixir/builds.txt



They’re ready now.


Seems that sorting still is incorrect.


Thanks for the continued work on Elixir!
Great to see is_map_key (I didn’t realize the reason it wasn’t included yet was because it depended on a newer erlang version).

1 Like

Another reason was the discussion if we should have 2 separate ways to achieve the same thing Map.has?/2 and is_map_key/2.

1 Like

fast, very nice, thank you


Nothing should rely on the file being sorted.

Windows install didn’t work for 1.10. Got the following message:
“c:/Program Files (x86)/Elixir/lib/iex/ebin/Elixir.IEx.CLI.beam”
2020-01-27 20:40:52 ~s~n
“beam/beam_load.c(1862): Error loading module ‘Elixir.IEx.CLI’:\n This BEAM file was compiled for a later version of the run-time system than 20.\n To fix this, please recompile this module with an 20 compiler.\n (Use of opcode 162; this emulator supports only up to 159.)\n”

You need to update your Erlang installation to Erlang/OTP 21.


Thank Jose! I tried to delete my 2nd post, but I had already deleted too much. It helps to read the entire install instructions! :roll_eyes:


hooray! Thanks for all the hard work.

Just reading it I’m already a fan of fixing the sorting module to Just Work

Feels nice to see this beautiful, round release version number, and all these great improvements. I love the new guard functions and updated env var support.

1 Like

Looks like some great improvements!

Hello , I am failing to build elixir-1.10.0 from source

Recompile: src/elixir
Generated elixir app
==> bootstrap (compile)
error: undef
stacktrace: [{elixir_aliases,expand,
make: *** [lib/elixir/ebin/Elixir.Kernel.beam] Error 1