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This finally exposes also the methods of these 3 classes in the Prelude
in order to allow to define basic class instances w/o needing imports.

This almost completes the primary goal of #9586

NOTE: `fold`, `foldl'`, `foldr'`, and `toList` are not exposed yet,
      as they require upstream fixes for at least `containers` and
      `bytestring`, and are not required for defining basic instances.

Reviewed By: ekmett, austin

Differential Revision: https://phabricator.haskell.org/D236

I this this arises from my de-orphaning the Enum Word instance

Signed-off-by: Austin Seipp <austin@well-typed.com>

* 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.

Now that we're in development mode, Applicative will soon be a
superclass of Monad in HEAD. So let's go ahead and deprecate the
-fno-warn-amp flag, remove the checks, and tweak a few tests
Signed-off-by: Austin Seipp <austin@well-typed.com>

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>

just like boxed type equalities.

The former adds a newline at the end (restoring the previous behaviour)
while the latter does not (which previously happened by turning the
thuing into a string and only then printing it).

...when debugging is on, to keep builds reports clean.

It seems that “Use bindLocalNamesFV in rn_inst_info” makes some names
nicer in the debugger output.

Issue #8022Signed-off-by: Austin Seipp <austin@well-typed.com>

The perf tests can probably be rechecked and tightened a little; I fixed
them with AMP the other day but some changes since then have made them
wibble perhaps.
Signed-off-by: Austin Seipp <austin@well-typed.com>

Authored-by: David Luposchainsky <dluposchainsky@gmail.com>
Signed-off-by: Austin Seipp <aseipp@pobox.com>

Signed-off-by: Austin Seipp <aseipp@pobox.com>

The driver now also supports nested lists of setup functions

Notably
 * Showing relevant bindings
 * Not suggesting add instance (Num T); see Trac #7222

Most of these tests were written by Nicolas Frisby.

We are careful to test slow calls and RtClosureInspect, as well as standard fast calls

Added an option to combine stdout and stderr into a single file. This is
useful for ghci scripts that produce interleaved errors and normal
output.

Also modified check_stderr_ok so that it normalizes stderr in the same
way as compile tests.