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<h3>
Ben Gamari pushed to branch ghc-8.8
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/334dd6da47326f47ba3425376728feda6245c7c1">334dd6da</a></strong>
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<span>by Ryan Scott</span>
<i>at 2019-05-08T13:31:22Z</i>
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<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.
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<h4>2 changed files:</h4>
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<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/334dd6da47326f47ba3425376728feda6245c7c1#8d11c404e91070407324f71df4a47224c0887148"><strong>docs/users_guide/8.8.1-notes.rst</strong></a>
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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">@@ -23,6 +23,21 @@ Full details</td>
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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="LC25" 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="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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93
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext"></span>
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94
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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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95
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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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96
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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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97
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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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98
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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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99
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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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79
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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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80
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102
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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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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -134,6 +156,13 @@ Template Haskell</td>
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<pre style="margin: 0;"> <span id="LC156" 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="LC157" 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="LC158" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC159" 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="LC160" 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="LC161" 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="LC162" class="line" lang="plaintext"> Please refer to the</span>
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<pre style="margin: 0;">+<span id="LC163" 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="LC164" class="line" lang="plaintext"> for more details.</span>
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="plaintext">- Template Haskell now supports implicit parameters and recursive do.</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 splices can now embed assembler source (:ghc-ticket:`16180`)</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">@@ -156,6 +185,20 @@ Template Haskell</td>
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<pre style="margin: 0;"> <span id="LC185" class="line" lang="plaintext">``base`` library</span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="plaintext">~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC188" 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="LC189" class="line" lang="plaintext"> result of this change:</span>
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC191" 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="LC192" class="line" lang="plaintext"> the same name in the ``MonadFail`` class.</span>
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC194" 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="LC195" class="line" lang="plaintext"> ``Control.Monad`` modules.</span>
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC197" 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="LC198" class="line" lang="plaintext"> refer to the</span>
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<pre style="margin: 0;">+<span id="LC199" 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="LC200" class="line" lang="plaintext"> for more details.</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">- 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="LC203" class="line" lang="plaintext"> (see :ghc-ticket:`5518`).</span>
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<pre style="margin: 0;"> <span id="LC204" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/334dd6da47326f47ba3425376728feda6245c7c1#392e9dfd3417e267d708c5ab16536f2994d43745"><strong>libraries/base/changelog.md</strong></a>
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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">@@ -3,6 +3,14 @@</td>
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<pre style="margin: 0;"> <span id="LC3" 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="LC4" 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="LC5" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC6" 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="LC7" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC8" 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="LC9" 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="LC10" class="line" lang="markdown"></span>
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<pre style="margin: 0;">+<span id="LC11" 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="LC12" class="line" lang="markdown"><span class="sb" style="color: #d14;"> `Control.Monad` modules.</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="markdown"></span>
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<pre style="margin: 0;"> <span id="LC14" 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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<pre style="margin: 0;"> <span id="LC15" 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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<pre style="margin: 0;"> <span id="LC16" class="line" lang="markdown"> syntactically correct Haskell for expressions like <span class="sb" style="color: #d14;">`Just (-1 :: Fixed E2)`</span>.</span>
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