- Update to 21.12.0b1:
  * Fix determination of f-string expression spans (#2654)
  * Fix bad formatting of error messages about EOF in multi-line statements (#2343)
  * Functions and classes in blocks now have more consistent surrounding spacing (#2472)
  * from __future__ import annotations statement now implies Python 3.7+ (#2690)
  * Fix assignment to environment variables in Jupyter Notebooks (#2642)
  * Point users to using --target-version py310 if we detect 3.10-only syntax (#2668)
  * Fix match statements with open sequence subjects, like match a, b: or match a, *b: (#2639) (#2659)
  * Fix match/case statements that contain match/case soft keywords multiple times, like match re.match() (#2661)
  * Fix case statements with an inline body (#2665)
  * Fix styling of starred expressions inside match subject (#2667)
  * Fix parser error location on invalid syntax in a match statement (#2649)
  * Fix Python 3.10 support on platforms without ProcessPoolExecutor (#2631)
  * Improve parsing performance on code that uses match under --target-version py310 up to ~50% (#2670)
  * Remove dependency on regex (#2644) (#2663)
  * Warn about Python 2 deprecation in more cases by improving Python 2 only syntax detection (#2592)
  * Add experimental PyPy support (#2559)
  * Add partial support for the match statement. As it's experimental, it's only enabled when --target-version py310 is explicitly specified (#2586)
  * Add support for parenthesized with (#2586)
  * Declare support for Python 3.10 for running Black (#2562)
  * Add new --workers parameter (#2514)
  * Fixed feature detection for positional-only arguments in lambdas (#2532)
  * Fixed a Python 3.10 compatibility issue where the loop argument was still being passed even though it has been removed (#2580)
  * Deprecate Python 2 formatting support (#2523)
  * Fix missing modules in self-contained binaries (#2466)
  * Fix missing toml extra used during installation (#2475)
  * Add support for formatting Jupyter Notebook files (#2357)
  * Move from appdirs dependency to platformdirs (#2375)
  * Present a more user-friendly error if .gitignore is invalid (#2414)
  * Pin setuptools-scm build-time dependency version (#2457)

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