- Elixir 1.14
* 1. Enhancements
EEx
[EEx] Support multi-line comments to EEx via <%!-- --%>
[EEx] Add EEx.tokenize/2
Elixir
[Access] Add Access.slice/1
[Application] Add Application.compile_env/4 and Application.compile_env!/3 to read the compile-time environment inside macros
[Calendar] Support ISO8601 basic format parsing with DateTime.from_iso8601/2
[Calendar] Add day/hour/minute on add/diff across different calendar modules
[Code] Add :normalize_bitstring_modifiers to Code.format_string!/2
[Code] Emit deprecation and type warnings for invalid options in on Code.compile_string/2 and Code.compile_quoted/2
[Code] Warn if an outdated lexical tracker is given on eval
[Code] Add Code.env_for_eval/1 and Code.eval_quoted_with_env/3
[Code] Improve stacktraces from eval operations on Erlang/OTP 25+
[Code.Fragment] Add support for __MODULE__ in several functions
[Code.Fragment] Support surround and context suggestions across multiple lines
[Enum] Allow slicing with steps in Enum.slice/2
[File] Support dereference_symlinks: true in File.cp/3 and File.cp_r/3
[Float] Do not show floats in scientific notation if below 1.0e16 and the fractional value is precisely zero
[Float] Add Float.min_finite/0 and Float.max_finite/0
[Inspect] Improve error reporting when there is a faulty implementation of the Inspect protocol
[Inspect] Allow :optional when deriving the Inspect protocol for hiding fields that match their default value
[Inspect] Inspect struct fields in the order they are declared in defstruct
[Inspect] Use expression-based inspection for Date.Range, MapSet, and Version.Requirement
[IO] Support Macro.Env and keywords as stacktrace definitions in IO.warn/2
[IO] Add IO.ANSI.syntax_colors/0 and related configuration to be shared across IEx and dbg
[Kernel] Add new dbg/0-2 macro
[Kernel] Allow any guard expression as the size of a bitstring in a pattern match
[Kernel] Allow composite types with pins as the map key in a pattern match
[Kernel] Print escaped version of control chars when they show up as unexpected tokens
[Kernel] Warn on confusable non-ASCII identifiers
[Kernel] Add .. as a nullary operator that returns 0..-1//1
[Kernel] Implement Unicode Technical Standard #39 recommendations. In particular, we warn for confusable scripts and restrict identifiers to single-scripts or highly restrictive mixed-scripts
[Kernel] Automatically perform NFC conversion of identifiers
[Kernel] Add binary_slice/2 and binary_slice/3
[Kernel] Lazily expand module attributes to avoid compile-time deps
[Kernel] Automatically cascade generated: true annotations on macro expansion
[Keyword] Add Keyword.from_keys/2 and Keyword.replace_lazy/3
[List] Add List.keysort/3 with support for a sorter function
[Macro] Add Macro.classify_atom/1 and Macro.inspect_atom/2
[Macro] Add Macro.expand_literal/2 and Macro.path/2
[Macro.Env] Add Macro.Env.prune_compile_info/1
[Map] Add Map.from_keys/2 and Map.replace_lazy/3
[MapSet] Add MapSet.filter/2, MapSet.reject/2, and MapSet.symmetric_difference/2
[Node] Add Node.spawn_monitor/2 and Node.spawn_monitor/4
[Module] Support new @after_verify attribute for executing code whenever a module is verified
[PartitionSupervisor] Add PartitionSupervisor that starts multiple isolated partitions of the same child for scalability
[Path] Add Path.safe_relative/1 and Path.safe_relative_to/2
[Registry] Add Registry.count_select/2
[Stream] Add Stream.duplicate/2 and Stream.transform/5
[String] Support empty lookup lists in String.replace/3, String.split/3, and String.splitter/3
[String] Allow slicing with steps in String.slice/2
[Task] Add :zip_input_on_exit option to Task.async_stream/3
[Task] Store :mfa in the Task struct for reflection purposes
[URI] Add URI.append_query/2
[Version] Add Version.to_string/1
[Version] Colorize Version.Requirement source in the Inspect protocol
ExUnit
[ExUnit] Add ExUnit.Callbacks.start_link_supervised!/2
[ExUnit] Add ExUnit.run/1 to rerun test modules
[ExUnit] Colorize summary in yellow with message when all tests are excluded
[ExUnit] Display friendly error when test name is too long
IEx
[IEx] Evaluate --dot-iex line by line
[IEx] Add line-by-line evaluation of IEx breakpoints
[IEx.Autocomplete] Autocomplete bitstrings modifiers (after :: inside <<...>>)
[IEx.Helpers] Allow an atom to be given to pid/1
[IEx.Helpers] Support sigils in h/1
Logger
[Logger] Add Logger.put_process_level/2
Mix
[Mix] Add :config_path and :lockfile options to Mix.install/2
[mix compile] Add --no-optional-deps to skip optional dependencies to test compilation works without optional dependencies
[mix compile] Include column information on error diagnostics when possible
[mix deps] Mix.Dep.Converger now tells which deps formed a cycle
[mix do] Support --app option to restrict recursive tasks in umbrella projects
[mix do] Allow using + as a task separator instead of comma
[mix format] Support filename in mix format - when reading from stdin
[mix format] Compile if mix format plugins are missing
[mix new] Do not allow projects to be created with application names that conflict with multi-arg Erlang VM switches
[mix profile] Return the return value of the profiled function
[mix release] Make BEAM compression opt-in
[mix release] Let :runtime_config_path accept false to skip the config/runtime.exs
[mix test] Improve error message when suite fails due to coverage
[mix test] Support :test_elixirc_options and default to not generating docs nor debug info chunk for tests
[mix xref] Support --group flag in mix xref graph
* 2. Bug fixes
Elixir
[Calendar] Handle widths with "0" in them in Calendar.strftime/3
[CLI] Improve errors on incorrect --rpc-eval usage
[CLI] Return proper exit code on Windows
[Code] Do not emit warnings when formatting code
[Enum] Allow slices to overflow on both starting and ending positions
[Kernel] Do not allow restricted characters in identifiers according to UTS39
[Kernel] Define __exception__ field as true when expanding exceptions in typespecs
[Kernel] Warn if any of True, False, and Nil aliases are used
[Kernel] Warn on underived @derive attributes
[Kernel] Remove compile-time dependency from defimpl :for
[Kernel] Track all arities on imported functions
[Kernel] Fix equality in guards for dynamic ranges without steps
[Module] Fix loop while unifying type variables
[Protocol] Warn if a protocol has no definitions
[Regex] Show list options when inspecting a Regex manually defined with Regex.compile/2
[String] Allow slices to overflow on both starting and ending positions
[System] Raise non-generic exception on missing env in System.fetch_env!/1 to mirror map operations
ExUnit
[ExUnit] Do not crash when diffing unknown bindings in guards
[ExUnit] Properly print diffs when comparing improper lists with strings at the tail position
[ExUnit] Add short hash to tmp_dir in ExUnit to avoid test name collision
[ExUnit] Do not store logs in the CLI formatter (this reduces memory usage for suites with capture_log)
[ExUnit] Run ExUnit.after_suite/1 callback even when no tests run
[ExUnit] Fix scenario where setup with imported function from within describe failed to compile
IEx
[IEx] Disallow short-hand pipe after matches
[IEx] Fix exports/1 in IEx for long function names
Mix
[mix compile.elixir] Fix --warnings-as-errors when used with --all-warnings
[mix compile.elixir] Ensure semantic recompilation cascades to path dependencies
[mix compile.elixir] Lock the compiler to avoid concurrent usage
[mix format] Do not add new lines if the formatted file is empty
[mix format] Properly compile dependencies on mix format
[mix release] Only set RELEASE_MODE after env.{sh,bat} are executed
[mix release] Allow application mode configuration to cascade to dependencies
[mix xref] Do not emit already consolidated warnings during mix xref trace
[Mix] Do not start apps with runtime: false on Mix.install/2
* 3. Soft deprecations (no warnings emitted)
Elixir
[File] Passing a callback as third argument to File.cp/3 and File.cp_r/3 is deprecated.
Instead pass the callback the :on_conflict key of a keyword list
EEx
[EEx] Using <%# ... %> for comments is deprecated. Please use <% # ... %> or the new multi-line comments with <%!-- ... --%>
Logger
[Logger] Deprecate Logger.enable/1 and Logger.disable/1 in favor of Logger.put_process_level/2
Mix
[mix cmd] The --app option in mix cmd CMD is deprecated in favor of the more efficient mix do --app app cmd CMD
* 4. Hard deprecations
Elixir
[Application] Calling Application.get_env/3 and friends in the module body is now discouraged, use Application.compile_env/3 instead
[Bitwise] use Bitwise is deprecated, use import Bitwise instead
[Bitwise] ~~~ is deprecated in favor of bnot for clarity
[Kernel.ParallelCompiler] Returning a list or two-element tuple from :each_cycle is deprecated, return a {:compile | :runtime, modules, warnings} tuple instead
[Kernel] Deprecate the operator <|> to avoid ambiguity with upcoming extended numerical operators
[String] Deprecate passing a binary compiled pattern to String.starts_with?/2
Logger
[Logger] Deprecate $levelpad on message formatting
Mix
[Mix] Mix.Tasks.Xref.calls/1 is deprecated in favor of compilation tracers
* 5. Backwards incompatible changes
Mix
[mix local.rebar] Remove support for rebar2, which has not been updated in 5 years, and is no longer supported on recent Erlang/OTP versions