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Changelog for Elixir v1.6

v1.6.0-dev

1. Enhancements

EEx

[EEx] Allow markers / and | to be used in a custom EEx engine

Elixir

[Inspect.Algebra] Add :strict and :flex breaks
[Inspect.Algebra] Add force_break/1 and next_break_fits/2 which give more control over document fitting
[Inspect.Algebra] Add collapse_lines/1 for collapsing multiple lines to a maximum value
[Inspect.Algebra] Allow nest/2 to be :reset or be set to the current :cursor position
[Kernel] Prefix variables with V when emitting Erlang code. This improves the integration with tools such as Erlang code formatters and the GUI debugger
[Kernel] Warn on the use of length(x) == 0 in guards
[Kernel] Warn if catch comes before rescue in try
[Kernel.ParallelCompiler] Add compile/2, compile_to_path/3 and require/2 which provide detailed information about warnings and errors
[Stream] Add Stream.intersperse/2
[String] Update to Unicode 10
[String] Allow passing empty string match to String.replace/4
[Time] Add Time.add/3

ExUnit

[ExUnit.Callbacks] Add ExUnit.Callbacks.start_supervised!/2

Mix

[mix archive.build] Allow mix archive.build to bundle dot files via an option
[mix compile] Define a behavior for Mix compiler tasks
[mix test] Run all functions in a describe block by giving the file:line the describe block starts
[mix test] Report the top N slowest tests with the --slowest N flag

2. Bug fixes

Elixir

[Kernel] Validate variable struct name is atom when used in pattern matching
[Macro] Fix Macro.to_string/2 for tuple calls, such as alias Foo.{Bar, Baz}
[MapSet] Return valid MapSet when unioning a legacy MapSet
[URI] Preserve empty fragments in URI.parse/1

Mix

[mix deps] Ensure optional dependencies in umbrella applications are loaded

3. Soft deprecations (no warnings emitted)

Elixir

[Inspect.Algebra] surround/3 and surround_many/6 are deprecated in favor of container_doc/6
[Kernel.ParallelCompiler] files/2 and files_to_path/3 are deprecated in favor of compile/2 and compile_to_path/3
[Kernel.ParallelRequire] files/2 is deprecated in favor of Kernel.ParallelCompiler.require/2

ExUnit

[ExUnit.Formatter] :case_started and :case_finished events are deprecated in favor of :module_started and :module_finished

Mix

[Mix.Shell] The cmd/2 callback is deprecated in favor of System.cmd/3 and Mix.Shell.cmd/3

4. Deprecations

Elixir

[Enum] Enum.partition/2 is deprecated in favor of Enum.split_with/2
[Keyword] Keyword.replace/3 is deprecated in favor of Keyword.fetch/2 and Keyword.put/3
[Map] Map.replace/3 is deprecated in favor of Map.fetch/2 and Map.put/3

v1.5

The CHANGELOG for v1.5 releases can be found in the v1.5 branch.