Elixir v1.20.0-rc.5

This release requires Erlang/OTP 27+ and is compatible with Erlang/OTP 29.

1. Enhancements

EEx

• [EEx] Optimize compiler by flattening expr list only once

Elixir

• [Base] Optimize Base validation functions by using SWAR techniques
• [Float] Optimize Float.round/2 by avoiding big integers
• [Inspect] Increase inspect limit to help print deeply nested data structures
• [Inspect] Support printing Erlang records (using Erlang notation)
• [Kernel] Add occurrence typing on case, cond, and with
• [Registry] Switch {:duplicate, :key} key_ets to ordered_set with composite keys
• [String] SWAR-optimize ASCII fast paths in String.length/1 and String.slice/3

ExUnit

• [ExUnit] Show remaining runs when using --repeat-until-failure

IEx

• [IEx.Helpers] Add source/1

Mix

• [mix app.tree] Support --output option
• [mix deps.tree] Support --output option
• [mix help] Support printing docs for types and callbacks
• [mix format] Support --no-compile option
• [mix source] Add mix source MODULE to print or open a given module/function location

2. Potential breaking changes

Elixir

• [Kernel] Disallow raw CR line ending in strings, comments and after ? for security reasons

3. Bug fixes

Elixir

• [Kernel] Fix a compiler crash when importing a module with only: :sigils option when the imported module exports non-sigil symbols with sigil_ prefix
• [Kernel] Reject negative Duration in to_timeout/1
• [Macro] Fix generation of heredocs in Macro.to_string/1 with escaped trailing newline
• [Path] Consistently return path as binary in Path.relative_to_cwd/2
• [Stream] Raise in Stream.cycle/1 when enumerable reduce call yields no elements
• [String] Support empty pattern list in String.count/2

Logger

• [Logger] Persist log level to app env in Logger.configure/1

Mix

• [Mix] Use non_executable_binary_to_term on loopback pubsub
• [mix compile.elixir] Fix scenario where Elixir would tag mtimes in the future