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Changelog for Elixir v1.15

This release requires Erlang/OTP 24 and later.

Compile and boot-time improvements

The last several releases brought improvements to compilation time and this version is no different. In particular, this version now caches and prunes load paths before compilation, ensuring your project (and dependencies!) compile faster and run in an environment closer to production.

In a nutshell, the Erlang VM loads modules from code paths. Each application that ships with Erlang and Elixir plus each dependency end-up being an entry in your code path. The larger the code path, the more work Erlang has to do in order to find a module.

In previous versions, Mix would only add to the load paths. Therefore, if you compiled 20 dependencies and you went to compile the 21st, the code path would have 21 entries (plus all Erlang and Elixir apps). This allowed modules from unrelated dependencies to be seen and made compilation slower the more dependencies you had.

In this release, we will now prune the code paths to only the ones listed as dependencies. Previously if you attempted to use an Erlang/OTP or Elixir module without adding its dependency, we would warn. Now the module won't be found altogether, which is also the behaviour you see if you ran your application as a mix release. If you are using an application that does not correctly lists its dependencies, they will have to be updated to correctly list all dependencies and avoid fault behaviour in both development and production.

Furthermore, Erlang/OTP 26 allows us to start applications concurrently and cache the code path lookups, decreasing the cost of booting applications. The combination of Elixir v1.15 and Erlang/OTP 26 should reduce the boot time of applications, such as when starting iex -S mix or running a single test with mix test, from 5% to 15%.

v1.15.0-dev

1. Enhancements

EEx

  • [EEx] Include source code snippets in syntax errors

Elixir

  • [Calendar] Add support for epoch time (%s) to Calendar.strftime/2
  • [Code] Code.format_string!/2 now converts 'charlists' into ~c"charlists" by default
  • [Code] Add :on_undefined_variable to the compiler options to preserve the warning behaviour which was deprecated back in Elixir v1.4
  • [Code] Add Code.loaded?/1 and Code.ensure_all_loaded(!)/1
  • [Code] Add Code.prepend_paths/1, Code.append_paths/1, and Code.delete_paths/1
  • [Code] Support nested expressions in Code.cursor_context/1
  • [Date] Add Date.before?/2 and Date.after?/2
  • [DateTime] Add DateTime.before?/2 and DateTime.after?/2
  • [Inspect] Inspect now renders 'charlists' as ~c"charlists" by default
  • [Kernel] Add t:nonempty_binary/0 and t:nonempty_bitstring/0
  • [Kernel] Treat @behaviours as runtime dependencies
  • [Kernel] Do not add runtime dependencies for alias references in patterns and guards
  • [Kernel] Warn for nested calls without parens inside keywords
  • [Kernel] Introduce mechanism to collect several errors in a module. Previously, as soon as there was a compilation error, compilation would fail. Now the compiler became a bit smarter and will report multiple errors whenever possible as multiple error: ... messages, similar to warning: ...
  • [Kernel.CLI] Support --sname undefined/--name undefined so a name is automatically generated
  • [Keyword] Add Keyword.split_with/2
  • [Macro] Improve error message when piping into an expression ending in bracket-based access
  • [Map] Add Map.split_with/2
  • [Map] Add Map.intersect/2 and Map.intersect/3
  • [MapSet] Add MapSet.split_with/2
  • [NaiveDateTime] Add NaiveDateTime.before?/2 and NaiveDateTime.after?/2
  • [Process] Add Process.alias/0,1 and Process.unalias/1
  • [Range] Add Range.split/2
  • [Sets] Optimize many functions in MapSet
  • [String] Update Unicode to version 15.0.0
  • [Supervisor] Add support for automatic shutdown in Supervisor
  • [System] Support :lines in System.cmd/3 to capture output line by line
  • [Task] Remove head of line blocking on Task.yield_many/2
  • [Task] Enable selective receive optimizations in Erlang/OTP 26+
  • [Time] Add Time.before?/2 and Time.after?/2
  • [URI] Add URI.append_path/2

ExUnit

  • [ExUnit] Add more color configuration to ExUnit CLI formatter
  • [ExUnit.Callbacks] Accept {module, function} tuples in ExUnit setup callbacks
  • [ExUnit.Doctest] Add ExUnit.DocTest.doctest_file/2
  • [ExUnit.Formatter] When comparing to anonymous functions, defined at the same place but capturing a different environment, we will now also diff the environments

IEx

  • [IEx] Make pry opt-in on dbg with --dbg pry
  • [IEx.Info] Implement protocol for Range and DateTime

Logger

  • [Logger.Formatter] Add support for ports in Logger metadata

Mix

  • [Mix.Project] Support def cli to unify all CLI defaults in a single place
  • [mix eval] Allow passing additional arguments
  • [mix compile] Set --all-warnings by default
  • [mix compile.app] Write optional_applications to .app file
  • [mix compile.elixir] Add --purge-consolidation-path-if-stale which will purge the given consolidation path if compilation is required
  • [mix deps.get] Automatically install Hex and Rebar on mix deps.get/mix deps.update
  • [mix deps.get] Support --check-locked which raises if changes to the lockfile are required
  • [mix format] Allow multiple formatters per file extension and sigil
  • [mix format] Show diffs whenever --check-formatted fails
  • [mix profile.fprof] Support --trace-to-file to improve performance when working with large outputs
  • [mix release] Allow passing additional arguments to the eval command

2. Bug fixes

Elixir

  • [Code.Formatter] Fix a scenario where a keyword followed by parenthesis could go above the maximum line length
  • [Code.Formatter] Remove unnecessary parens in nullary type funs
  • [File] Do not raise if there are file system race conditions in File.cp/2
  • [Kernel] Expand macros on the left side of -> in try/rescue
  • [Kernel] Raise on misplaced ... inside typespecs
  • [Kernel.ParallelCompiler] Make sure compiler doesn't crash when there are stray messages in the inbox
  • [URI] Make sure URI.merge/2 works accordingly with relative paths

ExUnit

  • [ExUnit] Fix crash when @tag capture_log: true was set to true and the Logger application was shut down in the middle of the test
  • [ExUnit] Do not merge context as tags inside the runner to reduce memory usage when emitting events to formatters
  • [ExUnit] Do not expand or collect vars from quote in ExUnit assertions

IEx

  • [IEx] Do not spawn a process to read IO. This fixes a bug where multiline paste stopped working whenever the input reader was killed
  • [IEx] Do not perform completion for prompts triggered during code evaluation

3. Soft deprecations (no warnings emitted)

Mix

  • [Mix.Project] :preferred_cli_env is deprecated in favor of :preferred_envs in def cli
  • [Mix.Project] :preferred_cli_target is deprecated in favor of :preferred_targets in def cli

4. Hard deprecations

Elixir

  • [Calendar] Calendar.ISO.day_of_week/3 is deprecated in favor of Calendar.ISO.day_of_week/4
  • [Exception] Exception.exception?/1 is deprecated in favor of Kernel.is_exception/1
  • [Kernel] Deprecate ... as a valid function call identifier
  • [Regex] Regex.regex?/1 is deprecated in favor of Kernel.is_struct/2

Logger

  • [Logger] Logger.warn/2 is deprecated in favor of Logger.warning/2

v1.14

The CHANGELOG for v1.14 releases can be found in the v1.14 branch.