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No point in pretending other compilers can use the GHC testsuite. This
makes the *.T files a bit shorter.

* extra_clean argument should be a list
  Add an assert to prevent regressions.

* properly clean package conf direcories
  They are directories now, which was causing problems.

* properly clean write_interface_* tests
  We were getting these errors:

  [Errno 21] Is a directory: './driver/write_interface_oneshot'
  [Errno 39] Directory not empty: './driver/write_interface_oneshot'
  [Errno 21] Is a directory: './driver/write_interface_make'
  [Errno 39] Directory not empty: './driver/write_interface_make'

* outputdir() is better than -outputdir, as it knows how to (pre)clean
  itself.

Reviewed By: hvr, austin

Differential Revision: https://phabricator.haskell.org/D770

Summary: Added packageName to GHC.Generics.Datatype class definition

Reviewers: hvr, dreixel, austin

Reviewed By: dreixel, austin

Subscribers: thomie

Differential Revision: https://phabricator.haskell.org/D631

GHC Trac Issues: #10030

I found several tests that failed when the interface file format changed,
due to leftover .hi file droppings.

I'm not sure I've done this right, but it should be a bit better

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

Summary: (this has been submitted on behalf on @dreixel)

Reviewers: simonpj, hvr, austin

Reviewed By: simonpj, austin

Subscribers: goldfire, thomie, carter, dreixel

Differential Revision: https://phabricator.haskell.org/D476

GHC Trac Issues: #5462

* Deprecate -XOverlappingInstances

* Update test suite.  Several tests even had entirely unnecessary
  uses of -XOverlappingInstances

* Update user manual with a careful description of the instance
  resolution story

* Fix an outright bug in the handling of duplidate instances in GHCi,
  which are meant to silently overwrite the earlier duplicate. The
  logic was right for family instances but was both more complicated,
  and plain wrong, for class instances.  (If you are interested, the
  bug was that we were eliminating the duplicate from the InstEnv, but
  not from the [ClsInst] held in tcg_insts.)  Test is ghci044a.

When deriving Functor, Foldable, Traversable, we need only look at the
way that the last type argument is treated.  It's fine for there to
be existentials etc, provided they don't affect the last type argument.

See Note [Check that the type variable is truly universal] in TcDeriv.

This matches GCC's choice of Unicode quotation marks (i.e. U+2018 and U+2019)
and therefore looks more familiar on the console. This addresses #2507.
Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

(this is related to #3647)

Most of these tests were written by Nicolas Frisby.

It was committed accidentally.

We now print less kind information in error messages

In particular, we are testing the output of deriving
Generic instances.