Official announcement: Elixir v1.16 released - The Elixir programming language

1. Enhancements

EEx

• [EEx] Include relative file information in diagnostics

Elixir

• [Code] Add :emit_warnings for Code.string_to_quoted/2
• [Code] Automatically include columns in parsing options
• [Code] Introduce MismatchedDelimiterError for handling mismatched delimiter exceptions
• [Code.Fragment] Handle anonymous calls in fragments
• [Code.Formatter] Trim trailing whitespace on heredocs with \r\n
• [File] Add :offset option to File.stream!/2
• [Kernel] Auto infer size of matched variable in bitstrings
• [Kernel] Preserve column information when translating typespecs
• [Kernel] Suggest module names based on suffix and casing errors when the module does not exist in UndefinedFunctionError
• [Kernel.ParallelCompiler] Introduce Kernel.ParallelCompiler.pmap/2 to compile multiple additional entries in parallel
• [Kernel.SpecialForms] Warn if True/False/Nil are used as aliases and there is no such alias
• [Macro] Add Macro.compile_apply/4
• [Module] Add support for @nifs annotation from Erlang/OTP 25
• [Module] Add support for missing @dialyzer configuration
• [String] Update to Unicode 15.1.0
• [String] Add String.replace_invalid/2
• [Task] Add :limit option to Task.yield_many/2

Logger

• [Logger] Add Logger.levels/0

Mix

• [mix] Add MIX_PROFILE to profile a list of comma separated tasks
• [mix archive.install] Support --sparse option
• [mix compile.app] Warn if both :applications and :extra_applications are used
• [mix compile.elixir] Pass original exception down to diagnostic :details when possible
• [mix compile.elixir] Optimize scenario where there are thousands of files in lib/ and one of them is changed
• [mix deps.clean] Emit a warning instead of crashing when a dependency cannot be removed
• [mix escript.install] Support --sparse option
• [mix release] Include include/ directory in releases
• [mix test] Allow testing multiple file:line at once, such as mix test test/foo_test.exs:13 test/bar_test.exs:27

2. Bug fixes

Elixir

• [Code] Keep quotes for atom keys in formatter
• [Code.Fragment] Fix crash in Code.Fragment.surround_context/2 when matching on ->
• [IO] Raise when using IO.binwrite/2 on terminated device (mirroring IO.write/2)
• [Kernel] Do not expand aliases recursively (the alias stored in Macro.Env is already expanded)
• [Kernel] Ensure dbg module is a compile-time dependency
• [Kernel] Warn when a private function or macro uses unquote/1 and the function/macro itself is unused
• [Kernel] Re-enabled compiler optimizations for top level functions in scripts (disabled in v1.14.0 but shouldn’t impact most programs)
• [Kernel] Do not define an alias for nested modules starting with Elixir. in their definition
• [Kernel.ParallelCompiler] Consider a module has been defined in @after_compile callbacks to avoid deadlocks
• [Macro] Address exception on Macro.to_string/1 for certain ASTs
• [Path] Lazily evaluate File.cwd!/0 in Path.expand/1 and Path.absname/1
• [Path] Ensure Path.relative_to/2 returns a relative path when the given argument does not share a common prefix with cwd

ExUnit

• [ExUnit] Raise on incorrectly dedented doctests

IEx

• [IEx.Pry] Fix prying functions with only literals in their body

Mix

• [mix archive.install] Restore code paths after mix archive.install
• [mix compile] Ensure files with duplicate modules are recompiled whenever any of the files change
• [mix compile] Update Mix compiler diagnostics documentation and typespecs to match the Elixir compiler behaviour where both lines and columns start from one (before it inaccurately said that columns started from zero)
• [mix escript.install] Restore code paths after mix escript.install

3. Soft deprecations (no warnings emitted)

Elixir

• [File] Deprecate File.stream!(file, options, line_or_bytes) in favor of keeping the options as last argument, as in File.stream!(file, line_or_bytes, options)
• [Kernel.ParallelCompiler] Deprecate Kernel.ParallelCompiler.async/1 in favor of Kernel.ParallelCompiler.pmap/2
• [Path] Deprecate Path.safe_relative_to/2 in favor of Path.safe_relative/2

Mix

• [mix compile] Returning a four-element tuple as a position in Mix.Task.Compiler.Diagnostic

4. Hard deprecations

Elixir

• [Date] Deprecate inferring a range with negative step, call Date.range/3 with a negative step instead
• [Enum] Deprecate passing a range with negative step on Enum.slice/2, give first..last//1 instead
• [Kernel] ~R/.../ is deprecated in favor of ~r/.../. This is because ~R/.../ still allowed escape codes, which did not fit the definition of uppercase sigils
• [String] Deprecate passing a range with negative step on String.slice/2, give first..last//1 instead

ExUnit

• [ExUnit.Formatter] Deprecate format_time/2, use format_times/1 instead

Mix

• [mix compile.leex] Require :leex to be added as a compiler to run the leex compiler
• [mix compile.yecc] Require :yecc to be added as a compiler to run the yecc compiler