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Changelog for Elixir v1.8

v1.8.0-dev

1. Enhancements

Elixir

  • [Calendar] Add Calendar.TimeZoneDatabase and a Calendar.UTCOnlyTimeZoneDatabase implementation
  • [DateTime] Add DateTime.from_naive/3, DateTime.now/1 and DateTime.shift_zone/3
  • [File] Allow :raw option in File.exists?/2, File.regular?/2 and File.dir?/2
  • [Inspect] Allow Inspect protocol to be derivable with the only/except options
  • [Kernel] Do not propagate counters to variables in quote inside another quote
  • [Kernel] Warn on ambiguous use of :: and | in typespecs
  • [Kernel] Add :delegate_to @doc metadata tag when using defdelegate
  • [Kernel] Improve compile-time building of ranges via the .. operator
  • [List] Add List.myers_difference/3
  • [Macro] Add Macro.struct!/2 for proper struct resolution during compile time
  • [Map] Optimize and merge nested maps put and merge operations
  • [Registry] Allow associating a value on :via tuple
  • [String] Add String.bag_distance/2

ExUnit

  • [ExUnit.Assertions] Show last N messages (instead of first N) from mailbox on assert_receive fail
  • [ExUnit] Add ExUnit.after_suite/1 callback

IEx

  • [IEx.Server] Expose IEx.Server for custom IEx sessions

Mix

  • [Mix.Project] Add :depth and :parents options to deps_paths/1
  • [mix compile] Include optional dependencies in :extra_applications
  • [mix format] Warn when the same file may be formatted by multiple .formatter.exs
  • [mix test] Allow setting the maximum number of failures via --max-failures
  • [mix test] Print a message instead of raising on unmatched tests inside umbrella projects

2. Bug fixes

Elixir

  • [Calendar] Allow printing dates with more than 9999 years
  • [Exception] Exclude deprecated functions in "did you mean?" hints
  • [Float] Handle subnormal floats in Float.ratio/1
  • [Kernel] Remove Guard test tuple_size(...) can never succeed dialyzer warning on try
  • [Kernel] Expand operands in size*unit bitstring modifier instead of expecting size and unit to be literal integers
  • [Kernel] Do not deadlock on circular struct dependencies in typespecs
  • [NaiveDateTime] Do not accept leap seconds in builder and parsing functions
  • [String] Fix ZWJ handling in Unicode grapheme clusters

Mix

  • [mix compile.protocols] Reconsolidate protocols if local deps is stale
  • [mix deps] Properly mark dependencies with different :system_env as diverged

3. Soft-deprecations (no warnings emitted)

4. Hard-deprecations

Elixir

  • [Enum] Passing a non-empty list to Enum.into/2 was inconsistent with maps and is deprecated in favor of Kernel.++/2 or Keyword.merge/2
  • [Inspect.Algebra] surround/3 is deprecated in favor of Inspect.Algebra.concat/2 and Inspect.Algebra.nest/2
  • [Inspect.Algebra] surround_many/6 is deprecated in favor of container_doc/6
  • [Kernel] Passing a non-empty list as :into in for comprehensions was inconsistent with maps and is deprecated in favor of Kernel.++/2 or Keyword.merge/2
  • [Kernel.ParallelCompiler] files/2 is deprecated in favor of compile/2
  • [Kernel.ParallelCompiler] files_to_path/2 is deprecated in favor of compile_to_path/2
  • [Kernel.ParallelRequire] files/2 is deprecated in favor of Kernel.ParallelCompiler.require/2
  • [System] :seconds, :milliseconds, etc. as time units is deprecated in favor of :second, :millisecond, etc.
  • [System] System.cwd/0 and System.cwd!/0 are deprecated in favor of File.cwd/0 and File.cwd!/0

Mix

  • [mix compile.erlang] Returning {:ok, contents} or :error as the callback in Mix.Compilers.Erlang.compile/6 is deprecated in favor of returning {:ok, contents, warnings} or {:error, errors, warnings}

v1.7

The CHANGELOG for v1.7 releases can be found in the v1.7 branch.