v1.15.1

1. Enhancements

• [Code] Code.string_to_quoted/2 honors :static_atoms_encoder for multi-letter sigils

2. Bug fixes

ExUnit

• [ExUnit.CaptureLog] Fix race condition on concurrent capture_log
• [ExUnit.CaptureLog] Respect options passed to nested capture_log calls
• [ExUnit.Doctest] Properly compile doctests without results terminated by fences
• [ExUnit.Doctest] Allow variables defined in doctests to be used in expectation

IEx

• [IEx] Ensure pry works on Erlang/OTP 25 and earlier while IEx is booting
• [IEx] Code.Fragment.surround_context considers surround context around spaces and parens

Logger

• [Logger] Do not assume Logger has been loaded at compile-time
• [Logger.Formatter] Properly handle :function as metadata

Mix

• [mix compile] Ensure the current project is available on the code path after its Elixir sources are compiled
• [mix compile] Guarantee yecc/leex are available when emitting warnings from previous runs
• [mix compile] Fix bug where an external resource was deleted after its
  mtime was successfully retrieved
• [mix compile] Track removed modules and exports across local deps
• [mix deps] Fix an issue where dependencies could not be started in an umbrella projects
• [mix release] Properly handle optional dependencies when there is a conflict in the application start mode
• [mix release] Remove --werl from release scripts on Erlang/OTP 26