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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>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d360f3438da7f6eb51e217c6697db6fb338c6fd7">d360f343</a></strong>
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<span>by MaxGabriel</span>
<i>at 2020-10-09T08:43:11-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Document -Wderiving-typeable
Tracking: #18641
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<h4>2 changed files:</h4>
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<a href="#c69ed1e399ce62d9f23fc51d2806dab1d9b7bfd6">
docs/users_guide/expected-undocumented-flags.txt
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<a href="#e16ae6db99f98868d3603a0c7df0bb6a793a330d">
docs/users_guide/using-warnings.rst
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<h4>Changes:</h4>
<li id="c69ed1e399ce62d9f23fc51d2806dab1d9b7bfd6">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d360f3438da7f6eb51e217c6697db6fb338c6fd7#c69ed1e399ce62d9f23fc51d2806dab1d9b7bfd6"><strong>docs/users_guide/expected-undocumented-flags.txt</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="4" 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">@@ -4,7 +4,6 @@</td>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">--show-packages</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext">-Onot</span>
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<td class="diff-line-num old_line" data-linenumber="6" 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="LC6" class="line" lang="plaintext">-Walternative-layout-rule-transitional</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">-Wderiving-typeable</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext">-XAlternativeLayoutRule</span>
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<td class="diff-line-num old_line" data-linenumber="9" 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="LC8" class="line" lang="plaintext">-XAlternativeLayoutRuleTransitional</span>
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<td class="diff-line-num new_line" data-linenumber="9" 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="LC9" class="line" lang="plaintext">-XAutoDeriveTypeable</span>
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<li id="e16ae6db99f98868d3603a0c7df0bb6a793a330d">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d360f3438da7f6eb51e217c6697db6fb338c6fd7#e16ae6db99f98868d3603a0c7df0bb6a793a330d"><strong>docs/users_guide/using-warnings.rst</strong></a>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="1881" 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>
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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">@@ -1881,6 +1881,20 @@ of ``-W(no-)*``.</td>
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1881
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<pre style="margin: 0;"> <span id="LC1881" class="line" lang="plaintext"></span>
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<td class="diff-line-num old_line" data-linenumber="1882" 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">
1882
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<td class="diff-line-num new_line" data-linenumber="1882" 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="LC1882" class="line" lang="plaintext"> Does nothing.</span>
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<pre style="margin: 0;"> <span id="LC1883" class="line" lang="plaintext"></span>
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<td class="diff-line-num new old_line" data-linenumber="1884" 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="LC1884" class="line" lang="plaintext">.. ghc-flag:: -Wderiving-typeable</span>
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<pre style="margin: 0;">+<span id="LC1885" class="line" lang="plaintext"> :shortdesc: warn when Typeable is derived</span>
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<td class="diff-line-num new new_line" data-linenumber="1886" 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="LC1886" class="line" lang="plaintext"> :type: dynamic</span>
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<pre style="margin: 0;">+<span id="LC1887" class="line" lang="plaintext"> :reverse: -Wno-deriving-typeable</span>
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<pre style="margin: 0;">+<span id="LC1888" class="line" lang="plaintext"> :category:</span>
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<pre style="margin: 0;">+<span id="LC1889" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC1890" class="line" lang="plaintext"> :since: 7.10</span>
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<pre style="margin: 0;">+<span id="LC1891" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC1892" class="line" lang="plaintext"> This flag warns when ``Typeable`` is listed in a deriving clause</span>
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<pre style="margin: 0;">+<span id="LC1893" class="line" lang="plaintext"> or derived with :extension:`StandaloneDeriving`.</span>
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<pre style="margin: 0;">+<span id="LC1894" class="line" lang="plaintext"></span>
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<td class="diff-line-num new new_line" data-linenumber="1895" 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">
1895
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<pre style="margin: 0;">+<span id="LC1895" class="line" lang="plaintext"> Since GHC 7.10, ``Typeable`` is automatically derived for all types.</span>
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<td class="diff-line-num new old_line" data-linenumber="1884" 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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1896
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<pre style="margin: 0;">+<span id="LC1896" class="line" lang="plaintext"> Thus, deriving ``Typeable`` yourself is redundant.</span>
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1897
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<pre style="margin: 0;">+<span id="LC1897" class="line" lang="plaintext"></span>
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1884
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1898
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<pre style="margin: 0;"> <span id="LC1898" class="line" lang="plaintext">If you're feeling really paranoid, the :ghc-flag:`-dcore-lint` option is a good choice.</span>
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1885
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1899
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<pre style="margin: 0;"> <span id="LC1899" class="line" lang="plaintext">It turns on heavyweight intra-pass sanity-checking within GHC. (It checks GHC's</span>
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1886
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1900
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<pre style="margin: 0;"> <span id="LC1900" class="line" lang="plaintext">sanity, not yours.)</span></pre>
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