1.15.0

Include source code snippets in syntax errors

Add support for epoch time (%s) to Calendar.strftime/2

Code.format_string!/2 now converts 'charlists' into ~c"charlists" by default

Add :on_undefined_variable to the compiler options to preserve the warning behaviour which was deprecated back in Elixir v1.4

Add Code.loaded?/1 and Code.ensure_all_loaded(!)/1

Add Code.prepend_paths/1, Code.append_paths/1, and Code.delete_paths/1

Add Code.with_diagnostics/2 to return diagnostics when compiling and evaluating code

Support nested expressions in Code.Fragment.cursor_context/1

Keep operators and no paren calls in Code.Fragment.container_cursor_to_quoted/1

Add Date.before?/2 and Date.after?/2

Add DateTime.before?/2 and DateTime.after?/2

Support precision in DateTime.utc_now/2

Support distributed File.Stream

Inspect now renders 'charlists' as ~c"charlists" by default

Break down case and cond inside dbg/2

Add t:nonempty_binary/0 and t:nonempty_bitstring/0

Treat @behaviours as runtime dependencies

Do not add runtime dependencies for alias references in patterns and guards

Warn for nested calls without parens inside keywords

Support for multi-letter uppercase sigils

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: ...

Raise instead of warning on undefined variables. Previously, an undefined variable would attempt to invoke a function of the same name, which led to confusing error messages, especially to newcomers. To enable the previous behaviour, invoke Code.compiler_options(on_undefined_variable: :warn) at the top of your mix.exs

Support --sname undefined/--name undefined so a name is automatically generated

Add Keyword.split_with/2

Improve error message when piping into an expression ending in bracket-based access

Add Macro.Env.lookup_alias_as/2

Add Map.split_with/2

Add Map.intersect/2 and Map.intersect/3

Add MapSet.split_with/2

Optimize most functions

Add NaiveDateTime.beginning_of_day/1 and NaiveDateTime.end_of_day/1

Add NaiveDateTime.before?/2 and NaiveDateTime.after?/2

Support precision in NaiveDateTime.utc_now/2

Mark functions as generated in "Docs" chunk

Add Module.get_last_attribute/3

Support :return_separator option

Add Process.alias/0,1 and Process.unalias/1

Add Range.split/2

Update Unicode to version 15.0.0

Add :fast_ascii mode to String.valid?/2

Add support for automatic shutdown in Supervisor

Support :lines in System.cmd/3 to capture output line by line

Remove head of line blocking on Task.yield_many/2

Enable selective receive optimizations in Erlang/OTP 26+

Reduce tasks footprint by avoiding unecessary work during spawning

Do not copy args on temporary Task.Supervisor.start_child/2

Add Time.before?/2 and Time.after?/2

Add URI.append_path/2

Add more color configuration to ExUnit CLI formatter

Accept {module, function} tuples in ExUnit setup callbacks

Add ExUnit.Case.get_last_registered_test/1

Add ExUnit.DocTest.doctest_file/2

Include doctest_data in doctest tags

When comparing two anonymous functions, defined at the same place but capturing a different environment, we will now also diff the environments

Make pry opt-in on dbg with --dbg pry

Support IEX_HOME

Only provide aliases when autocompleting alias, import, and require

Provide field completion on map and struct updates

Add runtime_info(:allocators)

Implement protocol for Range, DateTime, and Regex

Add Logger.add_handlers/1 and Logger.default_formatter/1

Introduce default_formatter and default_handler configuration for Logger which configures Erlang/OTP logger

Add :always_evaluate_messages configuration to Logger

Implement the Erlang Logger formatter API

Add support for ports in Logger metadata

Allow applications to be started concurrently via the :start_concurrently configuration

Set --all-warnings by default

Reduce the amount of filesystem lookups for path dependencies by storing timestamps in manifests

Track digests of @external_resources

Write optional_applications to .app file

Add --purge-consolidation-path-if-stale which will purge the given consolidation path if compilation is required

Automatically recompile dependencies if their compile env changes

Automatically install Hex and Rebar on mix deps.get/mix deps.update

Support --check-locked which raises if changes to the lockfile are required

Allow passing additional arguments

Support --no-exit option

Allow multiple formatters per file extension and sigil

Show diffs whenever --check-formatted fails

Allow the formatting root to be configured

Cache deps and archive loadpaths in Erlang/OTP 26

Support --trace-to-file to improve performance when working with large outputs

Allow passing additional arguments to the eval command

Support --output flag

Support def cli to unify all CLI defaults in a single place

Add Mix.Project.deps_tree/1

File.cp/3 and File.cp_r/3 with a function as third argument

Require pin variable when accessing variable inside binary size in match

Require the :return_diagnostics option to be

add_backend/2, remove_backend/2, and configure_backend/2 have been deprecated

The :console configuration has been deprecated in favor of :default_formatter

The :backends configuration has been deprecated in favor of Logger.add_handlers/1

:preferred_cli_env is deprecated in favor of :preferred_envs in def cli

:preferred_cli_target is deprecated in favor of :preferred_targets in def cli

The environment variable HEX_MIRROR is deprecated in favor of HEX_BUILDS_URL