v2.7.0.1 (release candidate)

Changes since v2.5.1.1:

Behavior changes:

• stack repl now always warns about GHCi problems with loading multiple
  packages. It also sets now proper working directory when invoked with
  one package. See
  #5421

• custom-setup dependencies are now properly initialized for stack dist.
  This makes explicit-setup-deps no longer required and that option was
  removed. See
  #4006

Other enhancements:

• Nix integration now passes ghcVersion (in addition to existing ghc) to
  shell-file as an identifier that can be looked up in a compiler attribute set.

• Nix integration now allows Nix integration if the user is ready in nix-shell.
  This gets rid of "In Nix shell but reExecL is False" error.

• stack list is a new command to list package versions in a snapshot.
  See #5431

• Consider GHC 9.0 a tested compiler and remove warnings.

• custom-preprocessor-extensions is a new configuration option for allowing
  stack to be aware of any custom preprocessors you have added to Setup.hs.
  See #3491

• Added --candidate flag to upload command to upload a package candidate
  rather than publishing the package.

• Error output using --no-interleaved-output no longer prepends indentating
  whitespace. This allows emacs compilation-mode and vim quickfix to locate
  and track errors. See
  #5523

Bug fixes:

• stack new now suppports branches other than master as default for
  GitHub repositories. See
  #5422

• Ignore all errors from hi-file-parser. See
  #5445 and
  #5486.

• Support basic auth in package-indices. See
  #5509.

• Add support for parsing .hi. files from GHC 8.10 and 9.0. See
  hi-file-parser#2.