[commit: ghc] ghc-8.6: users-guide: Fill out release highlights (3595949)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : ghc-8.6
Link       : http://ghc.haskell.org/trac/ghc/changeset/359594905e2ce04fbf3fb7fa4e9ecaa9953cb12c/ghc

>---------------------------------------------------------------

commit 359594905e2ce04fbf3fb7fa4e9ecaa9953cb12c
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Wed Sep 19 15:28:47 2018 -0400

    users-guide: Fill out release highlights


>---------------------------------------------------------------

359594905e2ce04fbf3fb7fa4e9ecaa9953cb12c
 docs/users_guide/8.6.1-notes.rst | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/docs/users_guide/8.6.1-notes.rst b/docs/users_guide/8.6.1-notes.rst
index 13fd354..2a54b41 100644
--- a/docs/users_guide/8.6.1-notes.rst
+++ b/docs/users_guide/8.6.1-notes.rst
@@ -13,6 +13,17 @@ Highlights
 
 The highlights, since the 8.4.1 release, are:
 
+- Support for :extension:`QuantifiedConstraints`.
+
+- A new flexible deriving scheme, :extension:`DerivingVia`.
+
+- A new plugin mechanism and support for plugins to modify their effect on GHC's
+  recompilation checking logic.
+
+- :ref:`Valid hole fits <typed-hole-valid-hole-fits>` in error messages.
+
+- A number of syntactic language extensions.
+
 - 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
@@ -231,6 +242,8 @@ Template Haskell
 ``ghc`` library
 ~~~~~~~~~~~~~~~
 
+- The ``Plugin`` record now has a several new fields for the new source plugins
+  and recompilation checking mechanisms.
 
 ``base`` library
 ~~~~~~~~~~~~~~~~
@@ -245,8 +258,6 @@ Template Haskell
 ``ghc-prim`` library
 ~~~~~~~~~~~~~~~~~~~~
 
--  Version number 0.5.2.1 (was 0.5.2.0)
-
 -  Added new ``addWordC#`` operation for unsigned addition with carry.
 
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