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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

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.

The Generics extension is no longer supported.

Revert "Revert commits 53b30fac9fc30d9d85cc... and c8244f5cd31774de2e39... as they were not intended for master."

This reverts commit d2fab4d8c428fc0a3b0f8ad288fc50d8d6ef0950, because these changes were intended for this branch.

Revert commits 53b30fac9fc30d9d85cc... and c8244f5cd31774de2e39... as they were not intended for master.