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Previously, when running `cabal check` all the various ghc-*-options
flags were merged together, thus losing the information about the exact
place of the warning. This PR implements separate checking of
ghc-*-options, which allows us to give users more precise warnings.

Fixes #5342

Filter out executables from package-id flags

Remove Text from D.Simple

- Add Parsec/Pretty CompilerId instances
- Fix Parsec PackageIdentifier instance (hopefully it wasn't used for
  anything important)

In the course of 4466310e (see #5526) the
`Setup.hs haddock` CLI was extended to allow component ids to be passed
as positional arguments. However, `autoconfUserHooks` which is used in
case of `build-type: Configure` wasn't updated accordingly, and consequently
this caused `new-haddock` to break for packages using `Configure`.

cc @alexbiehl

Fixes #5503

cc @phadej

Instead of directly committing binaries to GitHub (GitHub doesn't like them)
upload to Amazon S3. Any S3 bucket controlled by s3-bouncer
is acceptable; we have hardcoded s3-bouncer.heroku.com.
More info about s3-bouncer available at:
https://github.com/ezyang/s3-bouncerSigned-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

and clean up various aspects related to the `cabal-version` field

Fix #5541.

Lazy I/O strikes again.

Pass command line arguments to hsc2hs using response files

Fixes #5537.

[#5484] Add 'storedir' alias for 'store-dir'

Foreign Library RTS Selection

Don't throw away any program args in new-style commands

* use sudo: true on travis ci

* minor comment to explain previous change

This relies on having 4 core 16 gigs Travis machines enabled for the account.

Preprocess cabal-install.cabal

- Disable cabal-install's haddock on CI
- Temporarily disable cabal check (`-main-is` in tests)
- Remove this is not a lib note
- Tell to run git update-index --assume-unchanged

    ... when changing to -dev or -monolithic configuration.

    Run --no-assume-unchanged unconditionally, when
    changing to the production build.
- Improve auto-gen note in cabal-install.cabal
- Try to build haddock (with GHC-8.4.3 only)

- traversed is just a synonym for traverse
- filtered and non are "trust me". I don't: so they are defined locally.
- `to` is a lie, so renamed it to `getting` (also generalising the type).
- Also `unsafeCoerce`???
- Added `@since` annotations

Correct previous markup [skip ci]

GHC-8.6.1-beta is bunded with
- binary-0.8.6.0
- time-1.8.0.2
- unix-2.7.2.2

Solver: Improve handling of failures involving whole packages, such as unknown packages.