ANN: stack-2.7.1

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Emanuel Borsboom

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May 7, 2021, 4:46:52 PMMay 7
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See https://haskellstack.org/ for installation and upgrade instructions.

**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](https://github.com/commercialhaskell/stack/issues/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](https://github.com/commercialhaskell/stack/issues/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](https://github.com/commercialhaskell/stack/pull/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](https://github.com/commercialhaskell/stack/issues/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](https://github.com/commercialhaskell/stack/pull/5523)

Bug fixes:

* `stack new` now suppports branches other than `master` as default for
GitHub repositories. See
[#5422](https://github.com/commercialhaskell/stack/issues/5422)

* Ignore all errors from `hi-file-parser`. See
[#5445](https://github.com/commercialhaskell/stack/issues/5445) and
[#5486](https://github.com/commercialhaskell/stack/issues/5486).

* Support basic auth in package-indices. See
[#5509](https://github.com/commercialhaskell/stack/issues/5509).

* Add support for parsing `.hi`. files from GHC 8.10 and 9.0. See
[hi-file-parser#2](https://github.com/commercialhaskell/hi-file-parser/pull/2).

**Thanks to all our contributors for this release:**

* Aaron Allen
* Alexey Kuleshevich
* Andreas Källberg
* Domen Kožar
* Emanuel Borsboom
* Felix Yan
* Jens Petersen
* Kirill Zaborsky
* Marcin Tolysz
* Matt Audesse
* Matthew Wraith
* Michael Snoyman
* Mike Pilgrem
* Simon Michael

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