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<h3>
Ben Gamari pushed to branch wip/T18126
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/567c4d0316c3b75403854b38afe730c9a640327a">567c4d03</a></strong>
<div>
<span>by GHC GitLab CI</span>
<i>at 2020-08-06T21:50:36+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">users guide: Fix various markup issues
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<h4>4 changed files:</h4>
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<a href="#b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
docs/users_guide/8.12.1-notes.rst
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<a href="#afd1105d8e32dc50acf9fc381b4433a3bcd009cf">
docs/users_guide/exts/explicit_forall.rst
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<a href="#ed75822e0b6142f196a6abeb623c7669d31b4711">
docs/users_guide/exts/instances.rst
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<a href="#b02c1c6109c60b8f685234b0dbaabf6c79fed2a2">
docs/users_guide/ghci.rst
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<h4>Changes:</h4>
<li id="b421960e854c6cfa1e4ca830bd6a5fc6eef91168">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/567c4d0316c3b75403854b38afe730c9a640327a#b421960e854c6cfa1e4ca830bd6a5fc6eef91168"><strong>docs/users_guide/8.12.1-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">@@ -49,9 +49,10 @@ Highlights</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">  - GHC now relies on a new "ghc-bignum" package to provide Integer/Natural</span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext">    implementations. This package supports the following backends:</span>
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<pre style="margin: 0;">-<span id="LC52" class="line" lang="plaintext">      - gmp: adapted from integer-gmp package that was used before</span>
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<pre style="margin: 0;">-<span id="LC53" class="line" lang="plaintext">      - native: new Haskell implementation, faster than integer-simple which is</span>
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<pre style="margin: 0;">-<span id="LC54" class="line" lang="plaintext">        not used anymore</span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext">    - gmp: adapted from integer-gmp package that was used before</span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="plaintext">    - native: new Haskell implementation, faster than integer-simple which is</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">      not used anymore</span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext">  - All backends now use the same representation for big numbers (the one that</span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="plaintext">    was previously used only by integer-gmp). It led to several compiler</span>
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<li id="afd1105d8e32dc50acf9fc381b4433a3bcd009cf">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/567c4d0316c3b75403854b38afe730c9a640327a#afd1105d8e32dc50acf9fc381b4433a3bcd009cf"><strong>docs/users_guide/exts/explicit_forall.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">@@ -37,7 +37,7 @@ Notes:</td>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="plaintext">      instance forall a. Eq a => Eq [a] where ...</span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC40" class="line" lang="plaintext">  Note that the use of ``forall``s in instance declarations is somewhat</span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="plaintext">  Note that the use of ``forall``<span class="idiff left right">\ </span>s in instance declarations is somewhat</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">  restricted in comparison to other types. For example, instance declarations</span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="plaintext">  are not allowed to contain nested ``forall``s. See</span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="plaintext">  :ref:`formal-instance-syntax` for more information.</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/567c4d0316c3b75403854b38afe730c9a640327a#ed75822e0b6142f196a6abeb623c7669d31b4711"><strong>docs/users_guide/exts/instances.rst</strong></a>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="plaintext">  ``forall a. a`` and ``Eq a => a`` are not legal ``btype``s, but</span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="plaintext">  ``(forall a. a)`` and ``(Eq a => a)`` are legal.</span>
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<pre style="margin: 0;"> <span id="LC146" class="line" lang="plaintext">- ``ctype`` is a ``btype`` that has no restrictions on an outermost</span>
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="plaintext">  ``forall``/``=>``, so ``forall a. a`` and ``Eq a => a`` are legal ``ctype``s.</span>
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<pre style="margin: 0;">-<span id="LC148" class="line" lang="plaintext">- ``arg_type`` is a type that is not allowed to have ``forall``s or ``=>``s</span>
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext">  ``forall``/``=>``, so ``forall a. a`` and ``Eq a => a`` are legal ``ctype``<span class="idiff left right">\ </span>s.</span>
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="plaintext">- ``arg_type`` is a type that is not allowed to have ``forall``s or ``=>``<span class="idiff left right">\ </span>s</span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="plaintext">- ``prefix_cls_tycon`` is a class type constructor written prefix (e.g.,</span>
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<pre style="margin: 0;"> <span id="LC150" class="line" lang="plaintext">  ``Show`` or ``(&&&)``), while ``infix_cls_tycon`` is a class type constructor</span>
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="plaintext">  written infix (e.g., ```Show``` or ``&&&``).</span>
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<pre style="margin: 0;"> <span id="LC155" class="line" lang="plaintext">comments), but it is sufficient to attain an understanding of what is</span>
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<pre style="margin: 0;"> <span id="LC156" class="line" lang="plaintext">syntactically allowed. Some further various observations about this grammar:</span>
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<pre style="margin: 0;">-<span id="LC158" class="line" lang="plaintext">- Instance declarations are not allowed to be declared with nested ``forall``s</span>
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="plaintext">- Instance declarations are not allowed to be declared with nested ``forall``<span class="idiff left right">\ </span>s</span>
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<pre style="margin: 0;"> <span id="LC159" class="line" lang="plaintext">  or ``=>``s. For example, this would be rejected: ::</span>
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<pre style="margin: 0;"> <span id="LC160" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="plaintext">    instance forall a. forall b. C (Either a b) where ...</span>
</pre>
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<br>
</li>
<li id="b02c1c6109c60b8f685234b0dbaabf6c79fed2a2">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/567c4d0316c3b75403854b38afe730c9a640327a#b02c1c6109c60b8f685234b0dbaabf6c79fed2a2"><strong>docs/users_guide/ghci.rst</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2564" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2564,6 +2564,7 @@ commonly used commands.</td>
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<pre style="margin: 0;"> <span id="LC2564" class="line" lang="plaintext">    be used.</span>
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<pre style="margin: 0;"> <span id="LC2565" class="line" lang="plaintext"></span>
</pre>
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<td class="diff-line-num old_line" data-linenumber="2566" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2566" class="line" lang="plaintext">    .. code-block:: none</span>
</pre>
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<pre style="margin: 0;">+<span id="LC2567" class="line" lang="plaintext"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC2568" class="line" lang="plaintext">        ghci>:set -XDataKinds -XUndecidableInstances</span>
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<pre style="margin: 0;"> <span id="LC2569" class="line" lang="plaintext">        ghci>import GHC.TypeLits</span>
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<pre style="margin: 0;"> <span id="LC2570" class="line" lang="plaintext">        ghci>class A a</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2974" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2975" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -2974,6 +2975,11 @@ commonly used commands.</td>
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<pre style="margin: 0;"> <span id="LC2975" class="line" lang="plaintext">   *X> :type length</span>
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<td class="diff-line-num new_line" data-linenumber="2976" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
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<pre style="margin: 0;"> <span id="LC2976" class="line" lang="plaintext">   length :: Foldable t => t a -> Int</span>
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<pre style="margin: 0;"> <span id="LC2977" class="line" lang="plaintext"></span>
</pre>
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<td class="diff-line-num new new_line" data-linenumber="2978" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC2978" class="line" lang="plaintext">.. ghci-cmd:: :type +v; ⟨expression⟩</span>
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<pre style="margin: 0;">+<span id="LC2979" class="line" lang="plaintext"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC2980" class="line" lang="plaintext">    Infers and prints the type of ⟨expression⟩, binding inferred type variables</span>
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<pre style="margin: 0;">+<span id="LC2981" class="line" lang="plaintext">    with :ref:`*specified* visibility <inferred-vs-specified>`.</span>
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<pre style="margin: 0;">+<span id="LC2982" class="line" lang="plaintext"></span>
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2977
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<td class="diff-line-num new_line" data-linenumber="2983" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2983
</td>
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<pre style="margin: 0;"> <span id="LC2983" class="line" lang="plaintext">.. ghci-cmd:: :type +d; ⟨expression⟩</span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="2978" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2978
</td>
<td class="diff-line-num new_line" data-linenumber="2984" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2984
</td>
<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC2984" class="line" lang="plaintext"></span>
</pre>
</td>
</tr>
<tr class="line_holder" id="" style="line-height: 1.6;">
<td class="diff-line-num old_line" data-linenumber="2979" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2979
</td>
<td class="diff-line-num new_line" data-linenumber="2985" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">
2985
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC2985" class="line" lang="plaintext">    Infers and prints the type of ⟨expression⟩, instantiating *all* the forall</span>
</pre>
</td>
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