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<h3>
Richard Eisenberg pushed to branch wip/cfuneqcan-refactor
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/3b096c57992f68a6b36a1305ce5ca5e5f0fd58a8">3b096c57</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-10-23T16:55:19-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">A few error message wibbles
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/cdc73a4c3e789c7725e594b7582896301d77f8c7">cdc73a4c</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-10-23T16:56:32-04:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Fix trailing whitespace to appease linter
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#2863ddc563d2ff1540ccdae37cc7bce6f7f115ca">
testsuite/tests/indexed-types/should_fail/Simple13.hs
</a>
</li>
<li class="file-stats">
<a href="#450c4d136f7e999d04363e35060e5ea43ab3aac5">
testsuite/tests/indexed-types/should_fail/T13784.stderr
</a>
</li>
<li class="file-stats">
<a href="#1fd9911bd422ea4464eced9af36c9431a3d05a83">
testsuite/tests/partial-sigs/should_compile/T14715.stderr
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<li class="file-stats">
<a href="#1a3bd4bd170dca6edf211a71afc505abe9418542">
testsuite/tests/typecheck/should_compile/PolytypeDecomp.stderr
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</li>
<li class="file-stats">
<a href="#ef045b7d39e671fe4c034f0234f8e3b210dae601">
testsuite/tests/typecheck/should_compile/T5490.hs
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<h4>Changes:</h4>
<li id="2863ddc563d2ff1540ccdae37cc7bce6f7f115ca">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd69f2b1ddb2330a25847312964d7f7a939602dd...cdc73a4c3e789c7725e594b7582896301d77f8c7#2863ddc563d2ff1540ccdae37cc7bce6f7f115ca"><strong>testsuite/tests/indexed-types/should_fail/Simple13.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="21" 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">@@ -21,7 +21,7 @@ foo p = same p (mkf p)</td>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] g : a ~ [F a]</span></span>
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w : a ~ [F a]</span></span>
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<td class="line_content" style="padding-left: 0.5em; padding-right: 0.5em;">
<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">---><span class="idiff left right"> </span></span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">---></span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> g' = g;[x] g'=aq4</span></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [G] g' : a ~ [fsk] g=aqW</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] x : F a ~ fsk x=aq3</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="36" 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="36" 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">@@ -36,7 +36,7 @@ foo p = same p (mkf p)</td>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> w = g' ; w2</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w2 : [fsk] ~ [F a]</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> --> decompose<span class="idiff left right"> </span></span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> --> decompose</span></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> w2 = [w3]</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] w3 : fsk ~ F a</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="44" 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="44" 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">@@ -44,5 +44,5 @@ foo p = same p (mkf p)</td>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">cycle is</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aq3 = Sym (F aq4) ; aq5 x = Sym (F g') ; x2</span></span>
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<pre style="margin: 0;">-<span id="LC47" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aq4 = apw ; aq3 g' =<span class="idiff left right"> </span></span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> aq4 = apw ; aq3 g' =</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd69f2b1ddb2330a25847312964d7f7a939602dd...cdc73a4c3e789c7725e594b7582896301d77f8c7#450c4d136f7e999d04363e35060e5ea43ab3aac5"><strong>testsuite/tests/indexed-types/should_fail/T13784.stderr</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">@@ -15,7 +15,7 @@ T13784.hs:29:28: error:</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext">T13784.hs:33:24: error:</span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="plaintext"> • Couldn't match type: Product (a : as0)</span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext"> with: (b, Product (<span class="idiff left right">Divide b (a : as)</span>))</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> with: (b, Product (<span class="idiff left right">a : Divide b as</span>))</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"> Expected: (b, Product (Divide b (a : as)))</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> Actual: Product (a1 : as0)</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"> • In the expression: a :* divide as</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd69f2b1ddb2330a25847312964d7f7a939602dd...cdc73a4c3e789c7725e594b7582896301d77f8c7#1fd9911bd422ea4464eced9af36c9431a3d05a83"><strong>testsuite/tests/partial-sigs/should_compile/T14715.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T14715.hs:13:53: warning: [-Wpartial-type-signatures (in -Wdefault)]</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘Reduce <span class="idiff left right">(LiftOf zq)</span> zq’</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> Where: ‘z<span class="idiff left right">q’ is a rigid type variable</span> bound by</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Found type wildcard ‘_’ standing for ‘Reduce <span class="idiff left right">z</span> zq’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Where: ‘z<span class="idiff left right">’, ‘zq’ are rigid type variables</span> bound by</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> the inferred type of</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> bench_mulPublic :: (z ~ LiftOf zq, Reduce (LiftOf zq) zq) =></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> Cyc zp -> Cyc z -> IO (zp, zq)</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> at T14715.hs:13:<span class="idiff left right">32</span>-33</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> at T14715.hs:13:<span class="idiff left right">27</span>-33</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> • In the type signature:</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> bench_mulPublic :: forall z zp zq.</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> (z ~ LiftOf zq, _) => Cyc zp -> Cyc z -> IO (zp, zq)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd69f2b1ddb2330a25847312964d7f7a939602dd...cdc73a4c3e789c7725e594b7582896301d77f8c7#1a3bd4bd170dca6edf211a71afc505abe9418542"><strong>testsuite/tests/typecheck/should_compile/PolytypeDecomp.stderr</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">@@ -8,13 +8,3 @@ PolytypeDecomp.hs:30:17: error:</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> • In the expression: x</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> In the first argument of ‘myLength’, namely ‘[x, f]’</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> In the expression: myLength [x, f]</span></pre>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">PolytypeDecomp.hs:30:19: error:</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> • Couldn't match type ‘a0’ with ‘[forall a. F [a]]’</span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> Expected: Id a0</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> Actual: [forall a. F [a]]</span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext"> Cannot instantiate unification variable ‘a0’</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext"> with a type involving polytypes: [forall a. F [a]]</span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext"> • In the expression: f</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext"> In the first argument of ‘myLength’, namely ‘[x, f]’</span>
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<pre style="margin: 0;">-<span id="LC20" class="line" lang="plaintext"> In the expression: myLength [x, f]</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd69f2b1ddb2330a25847312964d7f7a939602dd...cdc73a4c3e789c7725e594b7582896301d77f8c7#ef045b7d39e671fe4c034f0234f8e3b210dae601"><strong>testsuite/tests/typecheck/should_compile/T5490.hs</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">@@ -16,7 +16,7 @@ import Data.Functor</td>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Exception</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Attempt</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">α</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Success</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">α</span></span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∀</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Exception</span> <span class="n" style="color: #333;">e</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">⇒</span> <span class="kt" style="color: #458; font-weight: 600;">Failure</span> <span class="n" style="color: #333;">e</span><span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∀</span> <span class="n" style="color: #333;">e</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">Exception</span> <span class="n" style="color: #333;">e</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">⇒</span> <span class="kt" style="color: #458; font-weight: 600;">Failure</span> <span class="n" style="color: #333;">e</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="n" style="color: #333;">fromAttempt</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="kt" style="color: #458; font-weight: 600;">Attempt</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">α</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">α</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">fromAttempt</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Success</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">a</span></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">@@ -136,7 +136,7 @@ instance IsPeano PZero where</td>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="haskell"> <span class="n" style="color: #333;">peano</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PZero</span></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">IsPeano</span> <span class="n" style="color: #333;">p</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">⇒</span> <span class="kt" style="color: #458; font-weight: 600;">IsPeano</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PSucc</span> <span class="n" style="color: #333;">p</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="haskell"> <span class="n" style="color: #333;">peano</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PSucc</span> <span class="n" style="color: #333;">peano</span><span class="idiff left right"> </span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="haskell"> <span class="n" style="color: #333;">peano</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">PSucc</span> <span class="n" style="color: #333;">peano</span></span>
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC141" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">class</span> <span class="p">(</span><span class="n" style="color: #333;">n</span> <span class="o" style="font-weight: 600;">~</span> <span class="kt" style="color: #458; font-weight: 600;">PSucc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">PPred</span> <span class="n" style="color: #333;">n</span><span class="p">))</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">⇒</span> <span class="kt" style="color: #458; font-weight: 600;">PHasPred</span> <span class="n" style="color: #333;">n</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC142" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">PPred</span> <span class="n" style="color: #333;">n</span></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">@@ -297,4 +297,3 @@ hGetIfNth _ _ = Nothing</td>
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<pre style="margin: 0;"> <span id="LC297" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC298" class="line" lang="haskell"><span class="n" style="color: #333;">elem0</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">∷</span> <span class="kt" style="color: #458; font-weight: 600;">HNonEmpty</span> <span class="n" style="color: #333;">l</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">⇒</span> <span class="kt" style="color: #458; font-weight: 600;">HElemOf</span> <span class="n" style="color: #333;">l</span> <span class="err" style="color: #a61717; background-color: #e3d2d2;">→</span> <span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HHead</span> <span class="n" style="color: #333;">l</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"><span class="n" style="color: #333;">elem0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">hGetIfNth</span> <span class="kt" style="color: #458; font-weight: 600;">PZero</span></span></pre>
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<pre style="margin: 0;">-<span id="LC300" class="line" lang="haskell"></span></pre>
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