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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:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/b0ccba66c4d7c16eba7e2fdc1857fc0f63cd33f9">b0ccba66</a></strong>
<div>
<span>by Krzysztof Gogolewski</span>
<i>at 2020-10-03T19:33:02-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Small documentation fixes

- Fix formatting of code blocks and a few sphinx warnings
- Move the Void# change to 9.2, it was done right after the branch was cut
- Fix typo in linear types documentation
- Note that -Wincomplete-uni-patterns affects lazy patterns

[skip ci]
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/70dc2f09a33a4c3f485d8b63e92a21955643a0b7">70dc2f09</a></strong>
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<span>by Karel Gardas</span>
<i>at 2020-10-03T19:33:06-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">fix rts.cabal to use real arch names and not aliasses (fixes #18654)
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<h4>8 changed files:</h4>
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<h4>Changes:</h4>
<li id="85c07986c623f3180b40021d7109edd1e6a71a93">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1033a720abf4a23a30c5cb0dfcb18b2bae3acc68...70dc2f09a33a4c3f485d8b63e92a21955643a0b7#85c07986c623f3180b40021d7109edd1e6a71a93"><strong>docs/users_guide/9.0.1-notes.rst</strong></a>
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="plaintext">* GHC more strictly enforces the rule that the type in the top of an instance</span>
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<pre style="margin: 0;"> <span id="LC194" class="line" lang="plaintext">  declaration is not permitted to contain nested ``forall``\ s or contexts, as</span>
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<pre style="margin: 0;"> <span id="LC195" class="line" lang="plaintext">  documented in :ref:`formal-instance-syntax`. For example, the following</span>
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="plaintext">  examples, which previous versions of GHC would accept, are now rejected:</span>
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="plaintext">  examples, which previous versions of GHC would accept, are now rejected:<span class="idiff left right"> ::</span></span>
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<pre style="margin: 0;"> <span id="LC197" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="plaintext">    instance (forall a. C a) where ...</span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="plaintext">    instance (Show a => C a) where ...</span>
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<pre style="margin: 0;"> <span id="LC349" class="line" lang="plaintext">- Add a known-key ``cstringLength#`` to ``GHC.CString`` that is eligible</span>
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<pre style="margin: 0;"> <span id="LC350" class="line" lang="plaintext">  for constant folding by a built-in rule.</span>
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<pre style="margin: 0;"> <span id="LC351" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="plaintext">- ``Void#`` is now a type synonym for the unboxed tuple ``(# #)``.</span>
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="plaintext">  Code using ``Void#`` now has to enable :extension:`UnboxedTuples`.</span>
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="plaintext">``ghc`` library</span>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="plaintext">~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="plaintext"></span>
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<li id="d87dfc77856eeaef6134e28336290ddcbcf18d7d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1033a720abf4a23a30c5cb0dfcb18b2bae3acc68...70dc2f09a33a4c3f485d8b63e92a21955643a0b7#d87dfc77856eeaef6134e28336290ddcbcf18d7d"><strong>docs/users_guide/9.2.1-notes.rst</strong></a>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext">  impredicative types, as described in in the paper</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext">  `A quick look at impredicativity</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext">  <https://www.microsoft.com/en-us/research/publication/a-quick-look-at-impredicativity/>`__</span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> (Serrano et al, ICFP 2020).  More information here: :ref:`impredicative-polymorphism`.</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> This replaces the old (undefined, flaky) behaviour of the :extension:`ImpredicativeTypes` extension.</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> <span class="idiff left right"> </span>(Serrano et al, ICFP 2020).  More information here: :ref:`impredicative-polymorphism`.</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> <span class="idiff left right"> </span>This replaces the old (undefined, flaky) behaviour of the :extension:`ImpredicativeTypes` extension.</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext">Compiler</span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">~~~~~~~~</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext">- New <span class="idiff left right">'-Wredundant-bang-patterns'</span> flag that enables checks for "dead" bangs.</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">- New <span class="idiff left right">``-Wredundant-bang-patterns``</span> flag that enables checks for "dead" bangs.</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext">  For instance, given this program: ::</span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">      f :: Bool -> Bool</span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="plaintext">  GHC would report that the bang on ``x`` is redundant and can be removed</span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext">  since the argument was already forced in the first equation. For more</span>
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<td class="diff-line-num new_line old" data-linenumber="29" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext">  details see :ghc-flag:`-Wredundant-bang-patterns`</span></pre>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext">  details see :ghc-flag:`-Wredundant-bang-patterns`.</span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="plaintext"></span>
</pre>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="plaintext">``ghc-prim`` library</span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext">- ``Void#`` is now a type synonym for the unboxed tuple ``(# #)``.</span>
</pre>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="plaintext">  Code using ``Void#`` now has to enable :extension:`UnboxedTuples`.</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1033a720abf4a23a30c5cb0dfcb18b2bae3acc68...70dc2f09a33a4c3f485d8b63e92a21955643a0b7#bdbe6161ac51a0072a62bb6ddfca5b31edfc51ff"><strong>docs/users_guide/exts/deriving_extra.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">@@ -233,7 +233,7 @@ simply force the (bottom) value of the argument using</td>
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<pre style="margin: 0;"> <span id="LC233" class="line" lang="plaintext">    data V a deriving Functor</span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="plaintext">    type role V nominal</span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC236" class="line" lang="plaintext">will produce</span>
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<pre style="margin: 0;">+<span id="LC236" class="line" lang="plaintext">will produce<span class="idiff left right"> ::</span></span>
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<pre style="margin: 0;"> <span id="LC237" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC238" class="line" lang="plaintext">    instance Functor V where</span>
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<pre style="margin: 0;"> <span id="LC239" class="line" lang="plaintext">      fmap _ z = case z of</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1033a720abf4a23a30c5cb0dfcb18b2bae3acc68...70dc2f09a33a4c3f485d8b63e92a21955643a0b7#0cc784483e34410e9b43b5cfc23ee304faba81d1"><strong>docs/users_guide/exts/gadt_syntax.rst</strong></a>
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<pre style="margin: 0;"> <span id="LC111" class="line" lang="plaintext">To make more precise what is and what is not permitted inside of a GADT-style</span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="plaintext">constructor, we provide a BNF-style grammar for GADT below. Note that this</span>
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<pre style="margin: 0;">-<span id="LC113" class="line" lang="plaintext">grammar is subject to change in the future. ::</span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="plaintext">grammar is subject to change in the future.</span>
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="plaintext">.. code-block:: none</span>
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<pre style="margin: 0;"> <span id="LC116" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC117" class="line" lang="plaintext">  gadt_con ::= conids '::' opt_forall opt_ctxt gadt_body</span>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1033a720abf4a23a30c5cb0dfcb18b2bae3acc68...70dc2f09a33a4c3f485d8b63e92a21955643a0b7#ed75822e0b6142f196a6abeb623c7669d31b4711"><strong>docs/users_guide/exts/instances.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">@@ -106,7 +106,9 @@ Formal syntax for instance declaration types</td>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="plaintext">The top of an instance declaration only permits very specific forms of types.</span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="plaintext">To make more precise what forms of types are or are not permitted, we provide a</span>
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<pre style="margin: 0;">-<span id="LC109" class="line" lang="plaintext">BNF-style grammar for the tops of instance declarations below: ::</span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="plaintext">BNF-style grammar for the tops of instance declarations below.</span>
</pre>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext">.. code-block:: none</span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="plaintext">  inst_top ::= 'instance' opt_forall opt_ctxt inst_head opt_where</span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="plaintext"></span>
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<li id="228f7530ac2289de7848ad95774f7aa4673c4431">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1033a720abf4a23a30c5cb0dfcb18b2bae3acc68...70dc2f09a33a4c3f485d8b63e92a21955643a0b7#228f7530ac2289de7848ad95774f7aa4673c4431"><strong>docs/users_guide/exts/linear_types.rst</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="90" 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="90" 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">@@ -90,7 +90,7 @@ therefore constructors appear to have regular function types.</td>
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90
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="plaintext"></span>
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91
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91
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<pre style="margin: 0;"> <span id="LC91" class="line" lang="plaintext">::</span>
</pre>
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92
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92
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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">    mkList :: [a] -> [<span class="idiff left right">Mk</span>T1 a]</span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="plaintext">    mkList :: [a] -> [T1 a]</span>
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94
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94
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="plaintext">    mkList xs = map MkT1 xs</span>
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95
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95
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<pre style="margin: 0;"> <span id="LC95" class="line" lang="plaintext"></span>
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96
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96
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<pre style="margin: 0;"> <span id="LC96" class="line" lang="plaintext">Hence the linearity of type constructors is invisible when</span>
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<br>
</li>
<li id="e16ae6db99f98868d3603a0c7df0bb6a793a330d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1033a720abf4a23a30c5cb0dfcb18b2bae3acc68...70dc2f09a33a4c3f485d8b63e92a21955643a0b7#e16ae6db99f98868d3603a0c7df0bb6a793a330d"><strong>docs/users_guide/using-warnings.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">@@ -860,8 +860,8 @@ of ``-W(no-)*``.</td>
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<pre style="margin: 0;"> <span id="LC860" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC861" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC862" class="line" lang="plaintext">.. ghc-flag:: -Wincomplete-uni-patterns</span>
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<td class="diff-line-num new_line old" data-linenumber="863" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#f9d7dc">
 
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<pre style="margin: 0;">-<span id="LC863" class="line" lang="plaintext">    :shortdesc: warn when a pattern match in a lambda expression<span class="idiff left right"> or</span></span>
</pre>
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<pre style="margin: 0;">-<span id="LC864" class="line" lang="plaintext">        pattern binding could fail</span>
</pre>
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<pre style="margin: 0;">+<span id="LC863" class="line" lang="plaintext">    :shortdesc: warn when a pattern match in a lambda expression<span class="idiff left right">,</span></span>
</pre>
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<pre style="margin: 0;">+<span id="LC864" class="line" lang="plaintext">        pattern binding <span class="idiff left right">or a lazy pattern </span>could fail</span>
</pre>
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865
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<td class="diff-line-num new_line" data-linenumber="865" 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">
865
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<pre style="margin: 0;"> <span id="LC865" class="line" lang="plaintext">    :type: dynamic</span>
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<pre style="margin: 0;"> <span id="LC866" class="line" lang="plaintext">    :reverse: -Wno-incomplete-uni-patterns</span>
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<pre style="margin: 0;"> <span id="LC867" class="line" lang="plaintext">    :category:</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="874" 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="874" 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">@@ -874,6 +874,10 @@ of ``-W(no-)*``.</td>
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<pre style="margin: 0;"> <span id="LC874" class="line" lang="plaintext">        h = \[] -> 2</span>
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<pre style="margin: 0;"> <span id="LC875" class="line" lang="plaintext">        Just k = f y</span>
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<pre style="margin: 0;"> <span id="LC876" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC877" class="line" lang="plaintext">    Furthermore, this flag also applies to lazy patterns, since they are</span>
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<pre style="margin: 0;">+<span id="LC878" class="line" lang="plaintext">    syntactic sugar for pattern bindings. For example, ``f ~(Just x) = (x,x)``</span>
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<pre style="margin: 0;">+<span id="LC879" class="line" lang="plaintext">    is equivalent to ``f y = let Just x = y in (x,x)``.</span>
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<pre style="margin: 0;">+<span id="LC880" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC881" class="line" lang="plaintext">.. ghc-flag:: -fmax-pmcheck-models=⟨n⟩</span>
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<pre style="margin: 0;"> <span id="LC882" class="line" lang="plaintext">    :shortdesc: soft limit on the number of parallel models the pattern match</span>
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<pre style="margin: 0;"> <span id="LC883" class="line" lang="plaintext">        checker should check a pattern match clause against</span>
</pre>
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<li id="e432c7b248b68100c3cc37db36ee80d975efd697">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/1033a720abf4a23a30c5cb0dfcb18b2bae3acc68...70dc2f09a33a4c3f485d8b63e92a21955643a0b7#e432c7b248b68100c3cc37db36ee80d975efd697"><strong>rts/rts.cabal.in</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">@@ -401,9 +401,9 @@ library</td>
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<pre style="margin: 0;"> <span id="LC401" class="line" lang="plaintext">                 -- AutoApply is generated</span>
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<pre style="margin: 0;"> <span id="LC402" class="line" lang="plaintext">                 AutoApply.cmm</span>
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<pre style="margin: 0;"> <span id="LC403" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC404" class="line" lang="plaintext">    if arch(i386) || arch(p<span class="idiff left right">owerpc) || arch(power</span>pc64)</span>
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<pre style="margin: 0;">+<span id="LC404" class="line" lang="plaintext">    if arch(i386) || arch(p<span class="idiff left right">pc) || arch(p</span>pc64)</span>
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<pre style="margin: 0;"> <span id="LC405" class="line" lang="plaintext">       asm-sources: AdjustorAsm.S</span>
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<pre style="margin: 0;">-<span id="LC406" class="line" lang="plaintext">    if arch(p<span class="idiff left right">owerpc) || arch(powerpc64) || arch(powerpc64le</span>) || arch(s390x)</span>
</pre>
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<pre style="margin: 0;">+<span id="LC406" class="line" lang="plaintext">    if arch(p<span class="idiff left right">pc) || arch(ppc64</span>) || arch(s390x)</span>
</pre>
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<pre style="margin: 0;"> <span id="LC407" class="line" lang="plaintext">       asm-sources: StgCRunAsm.S</span>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="plaintext"></span>
</pre>
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="plaintext">    c-sources: Adjustor.c</span>
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