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<h3>
 Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/786e665b8dac5430c02089b39f7cb7572a5254d8">786e665b</a></strong>
<div>
<span>by Ryan Scott</span>
<i>at 2019-05-08T05:55:45Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix #16603 by documenting some important changes in changelogs

This addresses some glaring omissions from
`libraries/base/changelog.md` and
`docs/users_guide/8.8.1-notes.rst`, fixing #16603 in the process.
</pre>
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<h4>2 changed files:</h4>
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<li class="file-stats">
<a href="#8d11c404e91070407324f71df4a47224c0887148">
docs/users_guide/8.8.1-notes.rst
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<li class="file-stats">
<a href="#392e9dfd3417e267d708c5ab16536f2994d43745">
libraries/base/changelog.md
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<h4>Changes:</h4>
<li id="8d11c404e91070407324f71df4a47224c0887148">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/786e665b8dac5430c02089b39f7cb7572a5254d8#8d11c404e91070407324f71df4a47224c0887148"><strong>docs/users_guide/8.8.1-notes.rst</strong></a>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">Language</span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext">- GHC now supports visible kind applications, as described in</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext">  `GHC proposal #15 <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0015-type-level-type-applications.rst>`__. This extends the existing</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext">  :ref:`visible type applications <visible-type-application>` feature to permit</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext">  type applications at the type level (e.g., ``f :: Proxy ('Just @Bool 'True)``) in</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext">  addition to the term level (e.g., ``g = Just @Bool True``).</span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">- GHC now allows explicitly binding type variables in type family instances and</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">  rewrite rules, as described in</span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">  `GHC proposal #7 <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0007-instance-foralls.rst>`__. For instance: ::</span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="plaintext">    type family G a b where</span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="plaintext">      forall x y. G [x] (Proxy y) = Double</span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="plaintext">      forall z.   G z   z         = Bool</span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="plaintext">    {-# RULES "example" forall a. forall (x :: a). id x = x #-}</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">- :extension:`ScopedTypeVariables`: The type variable that a type signature on</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext">  a pattern can bring into scope can now stand for arbitrary types. Previously,</span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext">  they could only stand in for other type variables, but this restriction was deemed</span>
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext">Compiler</span>
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<pre style="margin: 0;"> <span id="LC92" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="plaintext">- The final phase of the ``MonadFail`` proposal has been implemented.</span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext">  Accordingly, the ``MonadFailDesugaring`` language extension is now</span>
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext">  deprecated, as its effects are always enabled. Similarly, the</span>
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="plaintext">  ``-Wnoncanonical-monadfail-instances`` flag is also deprecated, as there is</span>
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext">  no longer any way to define a "non-canonical" ``Monad`` or ``MonadFail``</span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext">  instance.</span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC101" class="line" lang="plaintext">- New :ghc-flag:`-keep-hscpp-files` to keep the output of the CPP pre-processor.</span>
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<pre style="margin: 0;"> <span id="LC102" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="plaintext">- The :ghc-flag:`-Wcompat` warning group now includes :ghc-flag:`-Wstar-is-type`.</span>
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<pre style="margin: 0;"> <span id="LC165" class="line" lang="plaintext">  longer included when reifying ``C``. It's possible that this may break some</span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="plaintext">  code which assumes the existence of ``forall a. C a =>``.</span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC168" class="line" lang="plaintext">- Template Haskell has been updated to support visible kind applications and</span>
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<pre style="margin: 0;">+<span id="LC169" class="line" lang="plaintext">  explicit ``foralls`` in type family instances and ``RULES``. These required</span>
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<pre style="margin: 0;">+<span id="LC170" class="line" lang="plaintext">  a couple of backwards-incompatible changes to the ``template-haskell`` API.</span>
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<pre style="margin: 0;">+<span id="LC171" class="line" lang="plaintext">  Please refer to the</span>
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<pre style="margin: 0;">+<span id="LC172" class="line" lang="plaintext">  `GHC 8.8 Migration Guide <https://gitlab.haskell.org/ghc/ghc/wikis/migration/8.8#template-haskell-21500>`__</span>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="plaintext">  for more details.</span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="plaintext">- Template Haskell now supports implicit parameters and recursive do.</span>
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="plaintext">``ghc-prim`` library</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -164,6 +193,20 @@ Template Haskell</td>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="plaintext">``base`` library</span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="plaintext">~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="plaintext">- The final phase of the ``MonadFail`` proposal has been implemented. As a</span>
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="plaintext">  result of this change:</span>
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="plaintext">  - The ``fail`` method of ``Monad`` has been removed in favor of the method of</span>
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="plaintext">    the same name in the ``MonadFail`` class.</span>
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="plaintext">  - ``MonadFail(fail)`` is now re-exported from the ``Prelude`` and</span>
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="plaintext">    ``Control.Monad`` modules.</span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="plaintext">  These are breaking changes that may require you to update your code. Please</span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="plaintext">  refer to the</span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="plaintext">  `GHC 8.8 Migration Guide <https://gitlab.haskell.org/ghc/ghc/wikis/migration/8.8#base-41300>`__</span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="plaintext">  for more details.</span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC210" class="line" lang="plaintext">- Support the characters from recent versions of Unicode (up to v. 12) in literals</span>
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<pre style="margin: 0;"> <span id="LC211" class="line" lang="plaintext">    (see :ghc-ticket:`5518`).</span>
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<pre style="margin: 0;"> <span id="LC212" class="line" lang="plaintext"></span>
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<li id="392e9dfd3417e267d708c5ab16536f2994d43745">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/786e665b8dac5430c02089b39f7cb7572a5254d8#392e9dfd3417e267d708c5ab16536f2994d43745"><strong>libraries/base/changelog.md</strong></a>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">## 4.13.0.0 *TBA*</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="markdown"><span class="p">  *</span> Bundled with GHC <span class="ge" style="font-style: italic;">*TBA*</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="markdown"><span class="p">  *</span> The final phase of the <span class="sb" style="color: #d14;">`MonadFail`</span> proposal has been implemented:</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="markdown"><span class="sb" style="color: #d14;">    * The `fail` method of `Monad` has been removed in favor of the method of</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="markdown"><span class="sb" style="color: #d14;">      the same name in the `MonadFail` class.</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="markdown"><span class="sb" style="color: #d14;">    * `MonadFail(fail)` is now re-exported from the `Prelude` and</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="markdown"><span class="sb" style="color: #d14;">      `Control.Monad` modules.</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="markdown"></span>
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11
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19
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="markdown"><span class="p">  *</span> Fix <span class="sb" style="color: #d14;">`Show`</span> instance of <span class="sb" style="color: #d14;">`Data.Fixed`</span>: Negative numbers are now parenthesized</span>
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12
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="markdown">    according to their surrounding context. I.e. <span class="sb" style="color: #d14;">`Data.Fixed.show`</span> produces</span>
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13
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21
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="markdown">    syntactically correct Haskell for expressions like <span class="sb" style="color: #d14;">`Just (-1 :: Fixed E2)`</span>.</span>
</pre>
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