users-guide: Drop 8.6.1 release notes

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diff --git a/docs/users_guide/8.6.1-notes.rst b/docs/users_guide/8.6.1-notes.rst
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-.. _release-8-6-1:
-
-Release notes for version 8.6.1
-===============================
-
-The significant changes to the various parts of the compiler are listed in the
-following sections. There have also been numerous bug fixes and performance
-improvements over the 8.4.1 release.
-
-
-Highlights
-----------
-
-The highlights, since the 8.4.1 release, are:
-
-- Programs are no longer constrained by the Windows ``MAX_PATH`` file path
-  length limit. The file path limit is now approximately 32,767 characters. Note
-  that GHC itself is still somewhat limited due to GCC not supporting file
-  namespaced paths. Paths that are passed directly to the compiler, linker or
-  other GNU tools are currently still constrained. See :ref:`windows-file-paths`
-  for details.
-
-- Many, many bug fixes.
-
-
-Full details
-------------
-
-Language
-~~~~~~~~
-
-- Use of quantified type variables in constraints is now allowed via the
-  :extension:`QuantifiedConstraints` language extension. This long-awaited feature
-  enables users to encode significantly more precision in their types. For instance,
-  the common ``MonadTrans`` typeclass could now make the expectation that an
-  applied transformer is must be a ``Monad`` ::
-
-      class (forall m. Monad m => Monad (t m)) => MonadTrans t where {- ... -}
-
-  Additionally, quantification can enable terminating instance resolution
-  where this previously was not possible. See :ref:`quantified-constraints` for
-  details.
-
-- A new :extension:`DerivingVia` language extension has been added which allows
-  the use of the ``via`` deriving strategy. For instance: ::
-
-    newtype T = MkT Int
-      deriving Monoid via (Sum Int)
-
-  See :ref:`deriving-via` for more information.
-
-- A new :extension:`StarIsType` language extension has been added which controls
-  whether ``*`` is parsed as ``Data.Kind.Type`` or a regular type operator.
-  :extension:`StarIsType` is enabled by default.
-
-- GHC now permits the use of a wildcard type as the context of a standalone
-  ``deriving`` declaration with the use of the
-  :extension:`PartialTypeSignatures` language extension. For instance, this
-  declaration: ::
-
-    deriving instance _ => Eq (Foo a)
-
-  Denotes a derived ``Eq (Foo a)`` instance, where the context is inferred in
-  much the same way as ordinary ``deriving`` clauses do.
-  See :ref:`partial-type-signatures`.
-
-- Data declarations with empty ``where`` clauses are no longer valid without the
-  extension :extension:`GADTSyntax` enabled. For instance, consider the
-  following, ::
-
-      data T where
-
-  The grammar is invalid in Haskell2010. Previously it could be compiled successfully
-  without ``GADTs``. As of GHC 8.6.1, this is a parse error.
-
-- Incomplete patterns warning :ghc-flag:`-Wincomplete-patterns` is extended to
-  guards in pattern bindings and ``if`` alternatives of :extension:`MultiWayIf`.
-  For instance, consider the following, ::
-
-      foo :: Bool -> Int
-      foo b = if | b -> 1
-
-  In GHC 8.6.1, it will raise the warning: ::
-
-      <interactive>:2:12: warning: [-Wincomplete-patterns]
-          Pattern match(es) are non-exhaustive
-          In a multi-way if alternative:
-              Guards do not cover entire pattern space
-
-  See :ghc-ticket:`14773`.
-
-- Scoped type variables now work in default methods of class declarations
-  and in pattern synonyms in Template Haskell. See :ghc-ticket:`14885`.
-
-- ``do`` expressions, lambda expressions, etc. to be directly used as
-  a function argument, enabled with :extension:`BlockArguments`.
-  See :ref:`More liberal syntax for function arguments <block-arguments>`
-  for the full details.
-
-- Underscores in numeric literals (e.g. ``1_000_000``), enabled with
-  :extension:`NumericUnderscores`.
-  See :ref:`Numeric underscores <numeric-underscores>`
-  for the full details.
-
-- CUSKs now require all kind variables to be explicitly quantified. This was
-  already the case with :extension:`TypeInType`, but now :extension:`PolyKinds`
-  also exhibits this behavior. This means that the following example is no
-  longer considered to have a CUSK::
-
-   data T1 :: k -> Type       -- No CUSK: `k` is not explicitly quantified
-
-- Functionality of :extension:`TypeInType` has been subsumed by
-  :extension:`PolyKinds`, and it is now merely a shorthand for
-  :extension:`PolyKinds`, :extension:`DataKinds`, and :extension:`NoStarIsType`.
-  The users are advised to avoid :extension:`TypeInType` due to its misleading
-  name: the ``Type :: Type`` axiom holds regardless of whether it is enabled.
-
-- GHC has become more diligent about catching illegal uses of kind polymorphism.
-  For instance, GHC 8.4 would accept the following without the use of
-  :extension:`PolyKinds`::
-
-    f :: forall k (a :: k). Proxy a
-    f = Proxy
-
-  This is now an error unless :extension:`PolyKinds` is enabled.
-
-- The plugin mechanism has been extended to allow plugins to run between frontend
-  phases. Of particular note are the parser and typechecker plugins which run
-  after parsing and typechecking have completed. Collectively, these new extension
-  points are called :ref:`source plugins <source-plugins>`.
-	
-- Type literals now could be used in type class instances without the extension
-  :extension:`FlexibleInstances`.
-
-  See :ghc-ticket:`13833`.
-
-- :extension:`MonadFailDesugaring` is now enabled by default. See
-  `MonadFail Proposal (MFP)
-  <https://prime.haskell.org/wiki/Libraries/Proposals/MonadFail>`__
-  for more details.
-
-Compiler
-~~~~~~~~
-
-- GHC now no longer adds the current file's directory as a general include path
-  calling the C compiler. Instead we use ``-iquote`` to only add it as
-  an include path for `#include ""`. See :ghc-ticket:`14312`.
-
-- GHC now supports British spelling of :extension:`GeneralizedNewtypeDeriving`.
-
-- GHC now does significantly more constant folding in its core-to-core optimiser.
-  This will result in significantly better code being generated for some
-  programs. See :ghc-ticket:`9136`.
-
-- GHC now offers significantly more information about typed holes such as valid
-  hole fits and refinement hole fits. See :ref:`Valid Hole Fits <typed-hole-valid-hole-fits>`
-  for more information.
-
-- The code-generation effects of :ghc-flag:`-dynamic` can now be
-  enabled independently by the flag
-  :ghc-flag:`-fexternal-dynamic-refs`. If you don't know why you might
-  need this, you don't need it.
-
-- :ghc-flag:`-Wcompat` now includes :ghc-flag:`-Wimplicit-kind-vars` to
-  provide early detection of breakage that will be caused by implementation of
-  `GHC proposal #24
-  <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0024-no-kind-vars.rst>`__
-  in a future release.
-
-Plugins
-~~~~~~~
-
-- GHC's plugin mechanism now offers plugin authors control over their plugin's
-  effect on recompilation checking. Specifically the ``Plugin`` record name has
-  a new field ::
-
-    data Plugin = Plugin {
-        pluginRecompile :: [CommandLineOption] -> IO PluginRecompile
-      , {- ... -}
-      }
-
-    data PluginRecompile = ForceRecompile | NoForceRecompile | MaybeRecompile Fingerprint
-
-  Plugin based on ``defaultPlugin`` will have their previous recompilation
-  behavior (``ForceRecompile``) preserved. However, plugins that are "pure" are
-  encouraged to override this to either ``NoForceRecompile`` or ``MaybeRecompile``.
-  See :ref:`plugin_recompilation` for details.
-
-- GHC now provides a class of new plugins: source plugins. These plugins can
-  inspect and modify a variety of intermediate representations used by the
-  compiler's frontend. These include:
-
-    * The ability to modify the parser output
-    * The ability to inspect the renamer output
-    * The ability to modify the typechecked AST
-    * The ability to modify Template Haskell splices
-    * The ability to modify interface files as they are loaded
-
-  See :ref:`source-plugins` for details.
-
-GHCi
-~~~~
-
-- Added an experimental :ghci-cmd:`:doc` command that displays the
-  documentation for a declaration.
-
-Runtime system
-~~~~~~~~~~~~~~
-
-- The GHC runtime linker now prefers user shared libraries above system ones.
-  When extra search directories are specified these are searched before anything
-  else. This fixes ``iuuc`` on Windows given the proper search directories (e.g
-  ``-L/mingw64/lib``).
-
-- The GHC runtime linker now uses ``LIBRARY_PATH`` and the runtime loader now also
-  searches ``LD_LIBRARY_PATH``.
-
-- The GHC runtime on Windows is no longer constrained by the ``MAX_PATH`` file path
-  length limitation. See :ref:`windows-file-paths`.
-
-- The runtime now allows use of the :rts-flag:`-hT` profiling variety on
-  programs built with :ghc-flag:`-prof`.
-
-- The STM assertions mechanism (namely the ``always`` and ``alwaysSucceeds``
-  functions) has been removed. This happened a bit earlier than proposed in the
-  deprecation pragma included in GHC 8.4, but due to community feedback we
-  decided to move ahead with the early removal.
-
-Template Haskell
-~~~~~~~~~~~~~~~~
-
-``ghc`` library
-~~~~~~~~~~~~~~~
-
-
-``base`` library
-~~~~~~~~~~~~~~~~
-
-- ``($!)`` is now representation-polymorphic like ``($)``.
-
-- The module ``Data.Functor.Contravariant`` has been moved from the
-  ``contravariant`` package into ``base``. All the other modules in
-  ``contravariant`` (``Data.Functor.Contravariant.Divisible``, etc.)
-  have not been moved to ``base``, and they still reside in ``contravariant``.
-
-``ghc-prim`` library
-~~~~~~~~~~~~~~~~~~~~
-
--  Version number 0.5.2.1 (was 0.5.2.0)
-
--  Added new ``addWordC#`` operation for unsigned addition with carry.
-
-Build system
-~~~~~~~~~~~~
-
-
-Included libraries
-------------------
-
-The package database provided with this distribution also contains a number of
-packages other than GHC itself. See the changelogs provided with these packages
-for further change information.
-
-.. ghc-package-list::
-
-    libraries/array/array.cabal:             Dependency of ``ghc`` library
-    libraries/base/base.cabal:               Core library
-    libraries/binary/binary.cabal:           Dependency of ``ghc`` library
-    libraries/bytestring/bytestring.cabal:   Dependency of ``ghc`` library
-    libraries/Cabal/Cabal/Cabal.cabal:       Dependency of ``ghc-pkg`` utility
-    libraries/containers/containers/containers.cabal:   Dependency of ``ghc`` library
-    libraries/deepseq/deepseq.cabal:         Dependency of ``ghc`` library
-    libraries/directory/directory.cabal:     Dependency of ``ghc`` library
-    libraries/filepath/filepath.cabal:       Dependency of ``ghc`` library
-    compiler/ghc.cabal:                      The compiler itself
-    libraries/ghci/ghci.cabal:               The REPL interface
-    libraries/ghc-boot/ghc-boot.cabal:       Internal compiler library
-    libraries/ghc-compact/ghc-compact.cabal: Core library
-    libraries/ghc-prim/ghc-prim.cabal:       Core library
-    libraries/haskeline/haskeline.cabal:     Dependency of ``ghci`` executable
-    libraries/hpc/hpc.cabal:                 Dependency of ``hpc`` executable
-    libraries/integer-gmp/integer-gmp.cabal: Core library
-    libraries/mtl/mtl.cabal:                 Dependency of ``Cabal`` library
-    libraries/parsec/parsec.cabal:           Dependency of ``Cabal`` library
-    libraries/process/process.cabal:         Dependency of ``ghc`` library
-    libraries/template-haskell/template-haskell.cabal:     Core library
-    libraries/text/text.cabal:               Dependency of ``Cabal`` library
-    libraries/time/time.cabal:               Dependency of ``ghc`` library
-    libraries/transformers/transformers.cabal: Dependency of ``ghc`` library
-    libraries/unix/unix.cabal:               Dependency of ``ghc`` library
-    libraries/Win32/Win32.cabal:             Dependency of ``ghc`` library
-    libraries/xhtml/xhtml.cabal:             Dependency of ``haddock`` executable
diff --git a/docs/users_guide/index.rst b/docs/users_guide/index.rst
index c886722859..e629af67a5 100644
--- a/docs/users_guide/index.rst
+++ b/docs/users_guide/index.rst
@@ -12,7 +12,6 @@ Contents:
 
    license
    intro
-   8.6.1-notes
    8.8.1-notes
    8.10.1-notes
    ghci