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<h3>
Adam Gundry pushed to branch wip/amg/hasfield-2020
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/c64bf7b3669bc87affdc2cfd6b982b269f43c116">c64bf7b3</a></strong>
<div>
<span>by Adam Gundry</span>
<i>at 2020-09-25T14:22:46+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update user's guide for changes to HasField
</pre>
</li>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d32a697da0445cdda59ac72fa23fb54b8952475f">d32a697d</a></strong>
<div>
<span>by Adam Gundry</span>
<i>at 2020-09-25T14:22:46+01:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update HasField tests
Adapt overloadedrecflds tests and T17355 to new definition of HasField
Extend hasfieldrun01 test with partial record field test
Update hasfieldfail02 test to check unlifted type case
Accept changed T14189 output due to FieldLabel additional field
Adjust expected output from dynamic-paper
Add hasfieldrun03 test for example from user's guide
Metric Increase:
T12227
T12707
T13056
T15630
T18304
T9233
T9675
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<h4>16 changed files:</h4>
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<li class="file-stats">
<a href="#035ffbe37a399e332172fa413e52e6458d1fdd8c">
docs/users_guide/exts/hasfield.rst
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<li class="file-stats">
<a href="#3fa1c31577a138583da8f797e3719b53c0247443">
testsuite/tests/dependent/should_compile/dynamic-paper.stderr
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<li class="file-stats">
<a href="#636dca39aa6e2bd1f30a0a774930cfbf2a9892bb">
testsuite/tests/overloadedrecflds/should_fail/hasfieldfail01.hs
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<li class="file-stats">
<a href="#03d29b741f3306ba42347054c44ef8c15a7552bc">
testsuite/tests/overloadedrecflds/should_fail/hasfieldfail02.hs
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<li class="file-stats">
<a href="#33a4c44c2317c0d3f7de147ee3aa8182c490a472">
testsuite/tests/overloadedrecflds/should_fail/hasfieldfail02.stderr
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<li class="file-stats">
<a href="#1b475f8fa8f3f678e70b21506521a27436a155a6">
testsuite/tests/overloadedrecflds/should_fail/hasfieldfail03.hs
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<li class="file-stats">
<a href="#c73e1ce1fe3c633dc919d6be12b30c087b070c81">
testsuite/tests/overloadedrecflds/should_run/all.T
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<li class="file-stats">
<a href="#93ef6da93018df633b329966833b5d4b810ef047">
testsuite/tests/overloadedrecflds/should_run/hasfieldrun01.hs
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<li class="file-stats">
<a href="#c7c2209892c0096f460e99e5b3c04ffe016ed85d">
<span class="new-file">
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testsuite/tests/overloadedrecflds/should_run/hasfieldrun01.stderr
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<li class="file-stats">
<a href="#c1aaa75e19172f4f2f16d934991674d22ea34fb6">
testsuite/tests/overloadedrecflds/should_run/hasfieldrun01.stdout
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<li class="file-stats">
<a href="#2f13fcb0536a356e8f6a5eaeb6eac204294025ea">
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testsuite/tests/overloadedrecflds/should_run/hasfieldrun03.hs
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<li class="file-stats">
<a href="#cd14146c9eee8ccf022ab8d486ec2bd89b1b4887">
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testsuite/tests/overloadedrecflds/should_run/hasfieldrun03.stdout
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<li class="file-stats">
<a href="#19f278970b42262840ecdc9d56aad8e31814f3fe">
testsuite/tests/overloadedrecflds/should_run/overloadedrecfldsrun07.hs
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<li class="file-stats">
<a href="#135e8a0266490b1431fb14c57e432df93198ff91">
testsuite/tests/overloadedrecflds/should_run/overloadedrecfldsrun07.stdout
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<li class="file-stats">
<a href="#c7cbb518abd02952b7e40de417eb0ee3adf61a8c">
testsuite/tests/parser/should_compile/T14189.stderr
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<li class="file-stats">
<a href="#7d1b5953972c83695e1e7fa7817b5e4e95fffb61">
testsuite/tests/typecheck/should_fail/T17355.hs
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<h4>Changes:</h4>
<li id="035ffbe37a399e332172fa413e52e6458d1fdd8c">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#035ffbe37a399e332172fa413e52e6458d1fdd8c"><strong>docs/users_guide/exts/hasfield.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">@@ -6,15 +6,23 @@ Record field selector polymorphism</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">The module :base-ref:`GHC.Records.` defines the following: ::</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> class HasField (x :: k) r a | x r -> a where</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> <span class="idiff left right">getField :: r -> a</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> <span class="idiff left right">hasField :: r -> (a -> r, a)</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"></span>
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<td class="diff-line-num old_line" data-linenumber="11" 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="LC11" class="line" lang="plaintext">A ``HasField x r a`` constraint represents the fact that ``x`` is a</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext">field of type ``a`` belonging to a record type ``r``. The</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext">``<span class="idiff left right">getField`` method gives the record selector function</span>.</span>
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<td class="diff-line-num new old_line" data-linenumber="14" 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="LC13" class="line" lang="plaintext">``<span class="idiff left right">hasField`` method gives the ability to select and update the field</span>.</span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext">This allows definitions that are polymorphic over record types with a specified</span>
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<pre style="margin: 0;">-<span id="LC16" class="line" lang="plaintext">field. For example, the following works with any record type that has a field</span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext">``name :: String``: ::</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">This module also defines: ::</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"> getField :: forall x r a . HasField x r a => r -> a</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> getField = snd . hasField @x</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"> setField :: forall x r a . HasField x r a => r -> a -> r</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> setField = fst . hasField @x</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">These make it possible to write functions that are polymorphic over record types</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">with a specified field. For example, the following works with any record type</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext">that has a field ``name :: String``: ::</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"> foo :: HasField "name" r String => r -> String</span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext"> foo r = reverse (getField @"name" r)</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">@@ -31,8 +39,8 @@ Solving HasField constraints</td>
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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">If the constraint solver encounters a constraint ``HasField x r a``</span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="plaintext">where ``r`` is a concrete datatype with a field ``x`` in scope, it</span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="plaintext">will automatically solve the constraint <span class="idiff left right">using the field selector as</span></span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="plaintext"><span class="idiff left right">the </span>dictionary, unifying ``a`` with the type of the field if</span>
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<pre style="margin: 0;">+<span id="LC42" class="line" lang="plaintext">will automatically solve the constraint <span class="idiff left right">by generating a suitable</span></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="plaintext">dictionary, unifying ``a`` with the type of the field if</span>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="plaintext">necessary. This happens irrespective of which extensions are enabled.</span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext">For example, if the following datatype is in scope ::</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">@@ -52,12 +60,12 @@ to be solved. This retains the existing representation hiding</td>
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<pre style="margin: 0;"> <span id="LC60" class="line" lang="plaintext">mechanism, whereby a module may choose not to export a field,</span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext">preventing client modules from accessing or updating it directly.</span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC55" class="line" lang="plaintext">Solving ``HasField`` constraints depends on the field selector functions that</span>
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<pre style="margin: 0;">-<span id="LC56" class="line" lang="plaintext">are generated for each datatype definition:</span>
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63
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext">Solving ``HasField`` constraints depends on the type of the field:</span>
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57
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64
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="plaintext"></span>
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58
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<pre style="margin: 0;">-<span id="LC58" class="line" lang="plaintext">- If a record field does not have a selector function because its type would allow</span>
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59
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="plaintext"> an existential variable to escape, the corresponding ``HasField`` constraint</span>
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60
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<pre style="margin: 0;">-<span id="LC60" class="line" lang="plaintext"> will not be solved. For example, ::</span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext">- If a record field has a type containing an existential variable, it cannot</span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext"> have a selector function, and the corresponding ``HasField`` constraint will</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext"> not be solved, because this would allow the existential variable to escape.</span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext"> For example, ::</span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="plaintext"> {-# LANGUAGE ExistentialQuantification #-}</span>
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="plaintext"> data Exists t = forall x . MkExists { unExists :: t x }</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">@@ -67,14 +75,16 @@ are generated for each datatype definition:</td>
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="plaintext">- If a record field has a polymorphic type (and hence the selector function is</span>
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="plaintext"> higher-rank), the corresponding ``HasField`` constraint will not be solved,</span>
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<pre style="margin: 0;">-<span id="LC70" class="line" lang="plaintext"> because doing so would violate the functional dependency on ``HasField`` and/or</span>
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<pre style="margin: 0;">-<span id="LC71" class="line" lang="plaintext"> require impredicativity. For example, ::</span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="plaintext"> because doing so would violate the functional dependency on ``HasField``</span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="plaintext"> and/or require an impredicative constraint (which is not allowed even with</span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="plaintext"> :extension:`ImpredicativeTypes`). For example, ::</span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext"> {-# LANGUAGE RankNTypes #-}</span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext"> data Higher = MkHigher { unHigher :: forall t . t -> t }</span>
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="plaintext"> gives rise to a selector ``unHigher :: Higher -> (forall t . t -> t)`` but does</span>
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<pre style="margin: 0;">-<span id="LC77" class="line" lang="plaintext"> not lead to solution of the constraint ``HasField "unHigher" Higher a``.</span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="plaintext"> not lead to solution of the constraint ``HasField "unHigher" Higher a`` (which</span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="plaintext"> would require an impredicative instantiation of ``a`` with ``forall t . t -> t``).</span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="plaintext">- A record GADT may have a restricted type for a selector function, which may lead</span>
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<pre style="margin: 0;"> <span id="LC90" class="line" lang="plaintext"> to additional unification when solving ``HasField`` constraints. For example, ::</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">@@ -116,7 +126,7 @@ For example, this instance would make the ``name`` field of ``Person``</td>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="plaintext">accessible using ``#fullname`` as well: ::</span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC128" class="line" lang="plaintext"> instance HasField "fullname" Person String where</span>
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<pre style="margin: 0;">-<span id="LC119" class="line" lang="plaintext"> <span class="idiff left right">getField = name</span></span>
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<pre style="margin: 0;">+<span id="LC129" class="line" lang="plaintext"> <span class="idiff left right">hasField r = (\n -> r { name = n }, name r)</span></span>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="plaintext">More substantially, an anonymous records library could provide</span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="plaintext">``HasField`` instances for its anonymous records, and thus be</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">@@ -125,19 +135,34 @@ proposal. For example, something like this makes it possible to use</td>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="plaintext">``getField`` to access ``Record`` values with the appropriate</span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="plaintext">string in the type-level list of fields: ::</span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="plaintext"></span>
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138
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="plaintext"> {-# LANGUAGE DataKinds #-}</span>
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139
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="plaintext"> {-# LANGUAGE FlexibleContexts #-}</span>
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140
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="plaintext"> {-# LANGUAGE GADTs #-}</span>
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141
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext"> {-# LANGUAGE PolyKinds #-}</span>
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142
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext"> {-# LANGUAGE ScopedTypeVariables #-}</span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext"> {-# LANGUAGE TypeApplications #-}</span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="plaintext"> {-# LANGUAGE TypeOperators #-}</span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="plaintext"> {-# LANGUAGE UndecidableInstances #-}</span>
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146
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="plaintext"></span>
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147
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<pre style="margin: 0;">+<span id="LC147" class="line" lang="plaintext"> import Data.Kind (Type)</span>
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148
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<pre style="margin: 0;">+<span id="LC148" class="line" lang="plaintext"> import Data.Proxy (Proxy(..))</span>
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149
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<pre style="margin: 0;">+<span id="LC149" class="line" lang="plaintext"> import GHC.Records</span>
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150
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<pre style="margin: 0;">+<span id="LC150" class="line" lang="plaintext"></span>
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128
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151
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<pre style="margin: 0;"> <span id="LC151" class="line" lang="plaintext"> data Record (xs :: [(k, Type)]) where</span>
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129
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152
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<pre style="margin: 0;"> <span id="LC152" class="line" lang="plaintext"> Nil :: Record '[]</span>
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130
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153
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<pre style="margin: 0;"> <span id="LC153" class="line" lang="plaintext"> Cons :: Proxy x -> a -> Record xs -> Record ('(x, a) ': xs)</span>
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131
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154
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<pre style="margin: 0;"> <span id="LC154" class="line" lang="plaintext"></span>
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132
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<pre style="margin: 0;">-<span id="LC132" class="line" lang="plaintext"> instance HasField x (Record ('(x, a) ': xs)) a where</span>
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133
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<pre style="margin: 0;">-<span id="LC133" class="line" lang="plaintext"> <span class="idiff left right">getField (Cons _ v _) = v</span></span>
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155
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<pre style="margin: 0;">+<span id="LC155" class="line" lang="plaintext"> instance <span class="idiff left right">{-# OVERLAPS #-} </span>HasField x (Record ('(x, a) ': xs)) a where</span>
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156
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<pre style="margin: 0;">+<span id="LC156" class="line" lang="plaintext"> <span class="idiff left right">hasField (Cons p v r) = (\v' -> Cons p v' r, v)</span></span>
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134
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157
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<pre style="margin: 0;"> <span id="LC157" class="line" lang="plaintext"> instance HasField x (Record xs) a => HasField x (Record ('(y, b) ': xs)) a where</span>
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135
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<pre style="margin: 0;">-<span id="LC135" class="line" lang="plaintext"> getField (Cons _ _ r) = getField @x r</span>
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158
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<pre style="margin: 0;">+<span id="LC158" class="line" lang="plaintext"> hasField (Cons p v r) = (\v' -> Cons p v (set v'), a)</span>
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159
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<pre style="margin: 0;">+<span id="LC159" class="line" lang="plaintext"> where</span>
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160
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<pre style="margin: 0;">+<span id="LC160" class="line" lang="plaintext"> (set,a) = hasField @x r</span>
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136
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161
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<pre style="margin: 0;"> <span id="LC161" class="line" lang="plaintext"></span>
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137
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162
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<pre style="margin: 0;"> <span id="LC162" class="line" lang="plaintext"> r :: Record '[ '("name", String) ]</span>
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138
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<pre style="margin: 0;">-<span id="LC138" class="line" lang="plaintext"> r = Cons Proxy "R" Nil<span class="idiff left right">)</span></span>
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163
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<pre style="margin: 0;">+<span id="LC163" class="line" lang="plaintext"> r = Cons Proxy "R" Nil</span>
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139
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164
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<pre style="margin: 0;"> <span id="LC164" class="line" lang="plaintext"></span>
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140
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<pre style="margin: 0;">-<span id="LC140" class="line" lang="plaintext"> x = getField @"name" <span class="idiff left right">r</span></span>
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165
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<pre style="margin: 0;">+<span id="LC165" class="line" lang="plaintext"> x = getField @"name" <span class="idiff left right">(setField @"name" r "S")</span></span>
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<pre style="margin: 0;"> <span id="LC166" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="plaintext">Since representations such as this can support field labels with kinds other</span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="plaintext">than ``Symbol``, the ``HasField`` class is poly-kinded (even though the built-in</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">@@ -173,5 +198,27 @@ interests of simplicity we do not permit users to define their own instances</td>
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<pre style="margin: 0;"> <span id="LC198" class="line" lang="plaintext">either. If a field is not in scope, the corresponding instance is still</span>
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<pre style="margin: 0;"> <span id="LC199" class="line" lang="plaintext">prohibited, to avoid conflicts in downstream modules.</span>
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<pre style="margin: 0;"> <span id="LC200" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="plaintext">.. _compatibility-notes:</span>
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="plaintext">Compatibility notes</span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC205" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC206" class="line" lang="plaintext">``HasField`` was introduced in GHC 8.2.</span>
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<pre style="margin: 0;">+<span id="LC207" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC208" class="line" lang="plaintext">In versions of GHC prior to 9.2, the ``HasField`` class provided only a</span>
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<pre style="margin: 0;">+<span id="LC209" class="line" lang="plaintext">``getField`` method, so it was not possibly to update fields in a polymorphic</span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="plaintext">way. This means:</span>
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="plaintext">- Code using ``hasField`` or ``setField`` will require at least GHC 9.2.</span>
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213
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="plaintext">- Code using ``getField`` only may support GHC 8.2 and later, and should use</span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="plaintext"> ``import GHC.Records (HasField, getField)`` which works regardless of whether</span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="plaintext"> ``getField`` is a class method (prior to 9.2) or a function (9.2 and later).</span>
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<pre style="margin: 0;"> <span id="LC217" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC218" class="line" lang="plaintext">- User-defined ``HasField`` instances must use :extension:`CPP` to support GHC</span>
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<pre style="margin: 0;">+<span id="LC219" class="line" lang="plaintext"> versions before and after 9.2.</span>
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<pre style="margin: 0;"> <span id="LC220" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC221" class="line" lang="plaintext">:ref:`record-patsyn` do not lead to automatic solution of ``HasField`` instances</span>
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<pre style="margin: 0;">+<span id="LC222" class="line" lang="plaintext">for their fields, so if you replace a datatype with a pattern synonym where</span>
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<pre style="margin: 0;">+<span id="LC223" class="line" lang="plaintext">``HasField`` is in use, you may need to define :ref:`virtual-record-fields`</span>
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<pre style="margin: 0;">+<span id="LC224" class="line" lang="plaintext">manually.</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#3fa1c31577a138583da8f797e3719b53c0247443"><strong>testsuite/tests/dependent/should_compile/dynamic-paper.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">@@ -12,4 +12,4 @@ Simplifier ticks exhausted</td>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> simplifier non-termination has been judged acceptable.</span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="plaintext"> </span>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"> To see detailed counts use -ddump-simpl-stats</span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> Total ticks: 13<span class="idiff left right">6961</span></span></pre>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> Total ticks: 13<span class="idiff left right">9362</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#636dca39aa6e2bd1f30a0a774930cfbf2a9892bb"><strong>testsuite/tests/overloadedrecflds/should_fail/hasfieldfail01.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">@@ -2,7 +2,7 @@</td>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">HasFieldFail01_A</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">T</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Records</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasField</span><span class="p"><span class="idiff left">(</span></span><span class="o" style="font-weight: 600;"><span class="idiff">..</span></span><span class="p"><span class="idiff right">)</span>)</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Records</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasField</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff right">getField</span></span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This should fail to solve the HasField constraint, because foo is</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- not in scope.</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#03d29b741f3306ba42347054c44ef8c15a7552bc"><strong>testsuite/tests/overloadedrecflds/should_fail/hasfieldfail02.hs</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds, ExistentialQuantification, MagicHash, RankNTypes,</span></span>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> TypeApplications #-}</span></span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Records</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasField</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Prim</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Records</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasField</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">getField</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="p">{</span> <span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">MkU</span> <span class="p">{</span> <span class="n" style="color: #333;">bar</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">b</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">V</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkV</span> <span class="p">{</span> <span class="n" style="color: #333;">baz</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="o" style="font-weight: 600;">#</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This should fail because foo is higher-rank.</span></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"foo"</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="n" style="color: #333;">id</span><span class="p">)</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">@@ -13,4 +15,7 @@ x = getField @"foo" (MkT id)</td>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- involves an existential).</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"bar"</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkU</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</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="c1" style="color: #998; font-style: italic;">-- This should fail because baz is not of kind Type.</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"baz"</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkV</span> <span class="mi" style="color: #099;">3</span><span class="o" style="font-weight: 600;">#</span><span class="p">)</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;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span></pre>
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<li id="33a4c44c2317c0d3f7de147ee3aa8182c490a472">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#33a4c44c2317c0d3f7de147ee3aa8182c490a472"><strong>testsuite/tests/overloadedrecflds/should_fail/hasfieldfail02.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">hasfieldfail02.hs:1<span class="idiff left right">0</span>:5: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • No instance for (HasField "foo" T a<span class="idiff left right">1</span>)</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">hasfieldfail02.hs:1<span class="idiff left right">2</span>:5: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • No instance for (HasField "foo" T a<span class="idiff left right">2</span>)</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> arising from a use of ‘getField’</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the expression: getField @"foo" (MkT id)</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> In an equation for ‘x’:</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> x = getField @"foo" (MkT id)</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In an equation for ‘x’: x = getField @"foo" (MkT id)</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">hasfieldfail02.hs:1<span class="idiff left right">4</span>:5: error:</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> • No instance for (HasField "bar" U a<span class="idiff left right">0</span>)</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">hasfieldfail02.hs:1<span class="idiff left right">6</span>:5: error:</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> • No instance for (HasField "bar" U a<span class="idiff left right">1</span>)</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> arising from a use of ‘getField’</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> • In the expression: getField @"bar" (MkU True)</span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext"> In an equation for ‘y’: y = getField @"bar" (MkU True)</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext">hasfieldfail02.hs:19:5: error:</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> • No instance for (HasField "baz" V a0)</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> arising from a use of ‘getField’</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> • In the expression: getField @"baz" (MkV 3#)</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> In an equation for ‘z’: z = getField @"baz" (MkV 3#)</span></pre>
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<li id="1b475f8fa8f3f678e70b21506521a27436a155a6">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#1b475f8fa8f3f678e70b21506521a27436a155a6"><strong>testsuite/tests/overloadedrecflds/should_fail/hasfieldfail03.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">@@ -7,23 +7,23 @@ data T = MkT { foo :: Int, bar :: Int }</td>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This is far too polymorphic</span></span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="s" style="color: #d14;">"woo"</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">True</span></span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">undefined</span></span></span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This conflicts with the built-in instance</span></span>
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<pre style="margin: 0;"> <span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="s" style="color: #d14;">"foo"</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">foo</span></span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">undefined</span></span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- So does this</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="s" style="color: #d14;">"bar"</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">True</span></span></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">undefined</span></span></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- This doesn't conflict because there is no "baz" field in T</span></span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="s" style="color: #d14;">"baz"</span> <span class="kt" style="color: #458; font-weight: 600;">T</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC22" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">True</span></span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">undefined</span></span></span>
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<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="c1" style="color: #998; font-style: italic;">-- Bool has no fields, so this is okay</span></span>
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<pre style="margin: 0;"> <span id="LC25" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="n" style="color: #333;">a</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">i</span>d</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">undefine</span>d</span></span>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">V</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">d</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">@@ -32,8 +32,8 @@ data instance V x Int y [z] = MkVInt { baz :: (x, y, z, Bool) }</td>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Data families cannot have HasField instances, because they may get</span></span>
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<pre style="margin: 0;"> <span id="LC33" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- fields defined later on</span></span>
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<pre style="margin: 0;"> <span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="s" style="color: #d14;">"baz"</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">V</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">d</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC35" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">True</span></span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">undefined</span></span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Function types can have HasField instances, in case it's useful</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="s" style="color: #d14;">"woo"</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">const</span></span><span class="idiff"> </span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff right">True</span></span></span></pre>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">undefined</span></span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#c73e1ce1fe3c633dc919d6be12b30c087b070c81"><strong>testsuite/tests/overloadedrecflds/should_run/all.T</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">@@ -14,6 +14,7 @@ test('overloadedlabelsrun03', normal, compile_and_run, [''])</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">overloadedlabelsrun04</span><span class="p">',</span> <span class="p">[</span><span class="nv" style="color: #008080;">extra_files</span><span class="p">(['</span><span class="s1" style="color: #d14;">OverloadedLabelsRun04_A.hs</span><span class="p">']),</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="perl"> <span class="nv" style="color: #008080;">omit_ways</span><span class="p">(</span><span class="nv" style="color: #008080;">prof_ways</span><span class="p">)],</span> <span class="nv" style="color: #008080;">multimod_compile_and_run</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="perl"> <span class="p">['</span><span class="s1" style="color: #d14;">overloadedlabelsrun04</span><span class="p">',</span> <span class="nv" style="color: #008080;">config</span><span class="o" style="font-weight: 600;">.</span><span class="nv" style="color: #008080;">ghc_th_way_flags</span><span class="p">])</span></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">hasfieldrun01</span><span class="p">',</span> <span class="nv" style="color: #008080;"><span class="idiff left right">normal</span></span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">hasfieldrun01</span><span class="p">',</span> <span class="p"><span class="idiff left">[</span></span><span class="nv" style="color: #008080;"><span class="idiff">exit_code</span></span><span class="p"><span class="idiff">(</span></span><span class="mi" style="color: #099;"><span class="idiff">1</span></span><span class="p"><span class="idiff right">)]</span>,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">hasfieldrun02</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">hasfieldrun03</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T12243</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_and_run</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#93ef6da93018df633b329966833b5d4b810ef047"><strong>testsuite/tests/overloadedrecflds/should_run/hasfieldrun01.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">@@ -6,14 +6,19 @@</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , TypeFamilies</span></span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , TypeApplications</span></span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> #-}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_GHC -dcore-lint #-}</span></span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Records</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasField</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Records</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">HasField</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">),</span> <span class="nf" style="color: #900; font-weight: 600;">getField</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">setField</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkS</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">soo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Either</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">q</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="p">(</span><span class="n" style="color: #333;">p</span><span class="p">,</span><span class="n" style="color: #333;">q</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="kr" style="font-weight: 600;">where</span> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</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;">T</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="p">{</span> <span class="n" style="color: #333;">foo</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">,</span> <span class="n" style="color: #333;">bar</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">B</span> <span class="p">}</span></span>
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19
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkU</span> <span class="p">{</span> <span class="n" style="color: #333;">baf</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="n" style="color: #333;">family</span> <span class="kt" style="color: #458; font-weight: 600;">V</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span> <span class="n" style="color: #333;">c</span> <span class="n" style="color: #333;">d</span></span>
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<pre style="margin: 0;"> <span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">V</span> <span class="n" style="color: #333;">x</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="n" style="color: #333;">y</span> <span class="p">[</span><span class="n" style="color: #333;">z</span><span class="p">]</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkVInt</span> <span class="p">{</span> <span class="n" style="color: #333;">baz</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">y</span><span class="p">,</span> <span class="n" style="color: #333;">z</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span> <span class="p">}</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">@@ -22,8 +27,16 @@ data W a where</td>
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<pre style="margin: 0;"> <span id="LC27" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">MkW</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">{</span> <span class="n" style="color: #333;">woo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="p">}</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">W</span> <span class="p">[</span><span class="n" style="color: #333;">a</span><span class="p">]</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">X</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkX</span> <span class="p">{</span> <span class="n" style="color: #333;">xoo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Y</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Eq</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">MkY</span> <span class="p">{</span> <span class="n" style="color: #333;">yoo</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">a</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Z</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkZ1</span> <span class="p">{</span> <span class="n" style="color: #333;">partial</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">,</span> <span class="n" style="color: #333;">total</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">MkZ2</span> <span class="p">{</span> <span class="n" style="color: #333;">total</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="haskell"><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">S</span> <span class="p">(</span><span class="nb" style="color: #0086b3;">()</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"><span class="n" style="color: #333;">s</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkS</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Right</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="n" style="color: #333;">t</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT</span> <span class="mi" style="color: #099;">42</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="n" style="color: #333;">u</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="kt" style="color: #458; font-weight: 600;">Char</span> <span class="kt" style="color: #458; font-weight: 600;">Char</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">@@ -37,15 +50,28 @@ x = MkX True</td>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="haskell"><span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkY</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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<pre style="margin: 0;"> <span id="LC52" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="haskell"><span class="n" style="color: #333;">z</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkZ2</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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<pre style="margin: 0;">+<span id="LC54" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- A virtual foo field for U</span></span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="s" style="color: #d14;">"foo"</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">U</span> <span class="n" style="color: #333;">a</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Char</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="LC42" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff right">"virtual"</span></span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">r</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">const</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">r</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="s" style="color: #d14;"><span class="idiff">"virtual"</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC58" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC44" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"foo"</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="haskell"><span class="n" style="color: #333;">main</span> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"soo"</span> <span class="n" style="color: #333;">s</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"foo"</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"foo"</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"foo"</span> <span class="n" style="color: #333;">t</span> <span class="mi" style="color: #099;">11</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"bar"</span> <span class="n" style="color: #333;">t</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"bar"</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"bar"</span> <span class="n" style="color: #333;">t</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC64" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"baf"</span> <span class="n" style="color: #333;">u</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"baf"</span> <span class="n" style="color: #333;">u</span> <span class="sc" style="color: #d14;">'y'</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC66" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"foo"</span> <span class="n" style="color: #333;">u</span><span class="p">)</span></span>
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67
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"foo"</span> <span class="n" style="color: #333;">u</span> <span class="s" style="color: #d14;">"ignored"</span><span class="p">)</span></span>
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48
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68
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"baz"</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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69
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"baz"</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"baz"</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="mi" style="color: #099;">40</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">,</span> <span class="sc" style="color: #d14;">'y'</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">)))</span></span>
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49
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70
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<pre style="margin: 0;"> <span id="LC70" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"woo"</span> <span class="n" style="color: #333;">w</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="71" 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">
71
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"woo"</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"woo"</span> <span class="n" style="color: #333;">w</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">))</span></span>
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50
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72
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"xoo"</span> <span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="73" 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">
73
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"xoo"</span> <span class="n" style="color: #333;">x</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">)</span></span>
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51
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74
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<pre style="margin: 0;"> <span id="LC74" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"yoo"</span> <span class="n" style="color: #333;">y</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="75" 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">
75
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"yoo"</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"yoo"</span> <span class="n" style="color: #333;">y</span> <span class="kt" style="color: #458; font-weight: 600;">False</span><span class="p">))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="76" 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">
76
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">getField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"total"</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"total"</span> <span class="n" style="color: #333;">z</span> <span class="kt" style="color: #458; font-weight: 600;">True</span><span class="p">))</span></span>
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<td class="diff-line-num new new_line" data-linenumber="77" 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">
77
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="haskell"> <span class="n" style="color: #333;">print</span> <span class="p">(</span><span class="n" style="color: #333;">setField</span> <span class="o" style="font-weight: 600;">@</span><span class="s" style="color: #d14;">"partial"</span> <span class="n" style="color: #333;">z</span> <span class="mi" style="color: #099;">42</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- Should throw a "No match" error</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#c7c2209892c0096f460e99e5b3c04ffe016ed85d"><strong>testsuite/tests/overloadedrecflds/should_run/hasfieldrun01.stderr</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">hasfieldrun01: No match in record selector partial</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#c1aaa75e19172f4f2f16d934991674d22ea34fb6"><strong>testsuite/tests/overloadedrecflds/should_run/hasfieldrun01.stdout</strong></a>
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1
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">Right True</span>
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1
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2
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">42</span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext">11</span>
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2
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<td class="diff-line-num 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">
4
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext">True</span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext">False</span>
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3
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6
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext">'x'</span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext">MkU {baf = 'y'}</span>
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4
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<td class="diff-line-num new_line" data-linenumber="8" 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">
8
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext">"virtual"</span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext">MkU {baf = 'x'}</span>
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5
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10
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext">(42,'x',True,False)</span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext">(40,'y',False,True)</span>
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6
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12
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="plaintext">True</span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext">False</span>
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7
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<td class="diff-line-num new_line" data-linenumber="14" 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">
14
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext">True</span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">MkX {xoo = False}</span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext">True</span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">False</span>
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8
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18
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext">True</span></pre>
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<li id="2f13fcb0536a356e8f6a5eaeb6eac204294025ea">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#2f13fcb0536a356e8f6a5eaeb6eac204294025ea"><strong>testsuite/tests/overloadedrecflds/should_run/hasfieldrun03.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- This tests an example included in the GHC user's guide (see hasfield.rst).</span></span>
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2
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Please update the user's guide if it needs to be changed!</span></span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE DataKinds #-}</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE FlexibleContexts #-}</span></span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE GADTs #-}</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PolyKinds #-}</span></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ScopedTypeVariables #-}</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeApplications #-}</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE TypeOperators #-}</span></span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE UndecidableInstances #-}</span></span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span><span class="p">(</span><span class="o" style="font-weight: 600;">..</span><span class="p">))</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Records</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Record</span> <span class="p">(</span><span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="n" style="color: #333;">k</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</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="LC18" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nil</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Record</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">]</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Record</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Record</span> <span class="p">(</span><span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">x</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="n" style="color: #333;">xs</span><span class="p">)</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="kr" style="font-weight: 600;">instance</span> <span class="cp" style="color: #999; font-weight: 600;">{-# OVERLAPS #-}</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Record</span> <span class="p">(</span><span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">x</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="n" style="color: #333;">xs</span><span class="p">))</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="n" style="color: #333;">hasField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">v'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">v'</span> <span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">v</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Record</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="n" style="color: #333;">x</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Record</span> <span class="p">(</span><span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">y</span><span class="p">,</span> <span class="n" style="color: #333;">b</span><span class="p">)</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="n" style="color: #333;">xs</span><span class="p">))</span> <span class="n" style="color: #333;">a</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">hasField</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">v</span> <span class="n" style="color: #333;">r</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">\</span><span class="n" style="color: #333;">v'</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Cons</span> <span class="n" style="color: #333;">p</span> <span class="n" style="color: #333;">v</span> <span class="p">(</span><span class="n" style="color: #333;">set</span> <span class="n" style="color: #333;">v'</span><span class="p">),</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">set</span><span class="p">,</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;">hasField</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"> <span class="n" style="color: #333;">r</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Record</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">"</span><span class="n" style="color: #333;">name</span><span class="s" style="color: #d14;">", String) ]</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="s" style="color: #d14;"> r = Cons Proxy "</span><span class="kt" style="color: #458; font-weight: 600;">R</span><span class="s" style="color: #d14;">" Nil</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"><span class="s" style="color: #d14;"> x = getField @"</span><span class="n" style="color: #333;">name</span><span class="s" style="color: #d14;">" (setField @"</span><span class="n" style="color: #333;">name</span><span class="s" style="color: #d14;">" r "</span><span class="kt" style="color: #458; font-weight: 600;">S</span><span class="s" style="color: #d14;">")</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="haskell"><span class="s" style="color: #d14;"> main = print x</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#cd14146c9eee8ccf022ab8d486ec2bd89b1b4887"><strong>testsuite/tests/overloadedrecflds/should_run/hasfieldrun03.stdout</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="plaintext">"S"</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#19f278970b42262840ecdc9d56aad8e31814f3fe"><strong>testsuite/tests/overloadedrecflds/should_run/overloadedrecfldsrun07.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">@@ -6,6 +6,7 @@</td>
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6
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6
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , MultiParamTypeClasses</span></span>
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7
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7
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , OverloadedLabels</span></span>
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8
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8
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , ScopedTypeVariables</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , StandaloneDeriving</span></span>
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9
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10
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , TypeApplications</span></span>
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10
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11
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , TypeOperators</span></span>
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11
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12
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<pre style="margin: 0;"> <span id="LC12" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;"> , UndecidableInstances</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">@@ -15,20 +16,29 @@ import GHC.OverloadedLabels</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;">GHC.Records</span></span>
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<pre style="margin: 0;"> <span id="LC17" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.TypeLits</span></span>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Proxy</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="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Label</span> <span class="p">(</span><span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Symbol</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Label</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">KnownSymbol</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Label</span> <span class="n" style="color: #333;">x</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="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">show</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"#"</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">symbolVal</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Proxy</span> <span class="o" style="font-weight: 600;">@</span><span class="n" style="color: #333;">x</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC26" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Labelled</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Label</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">:=</span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">deriving</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span></span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="o" style="font-weight: 600;">::</span> <span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">k</span><span class="o" style="font-weight: 600;">.</span> <span class="p">[(</span><span class="n" style="color: #333;">k</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Nil</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">]</span></span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="haskell"> <span class="p">(</span><span class="o" style="font-weight: 600;">:></span><span class="p">)</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Labelled</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="n" style="color: #333;">xs</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="p">(</span><span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">x</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="n" style="color: #333;">xs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="sc" style="color: #d14;">'[</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">]</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="LC33" class="line" lang="haskell"> <span class="n" style="color: #333;">show</span> <span class="kt" style="color: #458; font-weight: 600;">Nil</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"Nil"</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">deriving</span> <span class="kr" style="font-weight: 600;">instance</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">KnownSymbol</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="n" style="color: #333;">xs</span><span class="p">))</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="p">(</span><span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">x</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="n" style="color: #333;">xs</span><span class="p">))</span></span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">infixr</span> <span class="mi" style="color: #099;">5</span> <span class="o" style="font-weight: 600;">:></span></span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="cp" style="color: #999; font-weight: 600;">{-# OVERLAPS #-}</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">~</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="n" style="color: #333;">foo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="p">(</span><span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">f</span><span class="n" style="color: #333;">oo</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="n" style="color: #333;">xs</span><span class="p">))</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="p"><span class="idiff">((</span></span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:></span></span><span class="idiff"> </span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">v</span></span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="p"><span class="idiff">((</span></span><span class="n" style="color: #333;"><span class="idiff">l</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">xs</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v'</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">l</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v'</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">xs</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="n" style="color: #333;">foo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="n" style="color: #333;">xs</span><span class="p">)</span> <span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="n" style="color: #333;">foo</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Rec</span> <span class="p">(</span><span class="sc" style="color: #d14;">'(</span><span class="err" style="color: #a61717; background-color: #e3d2d2;">b</span><span class="n" style="color: #333;">ar</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="sc" style="color: #d14;">':</span><span class="err" style="color: #a61717; background-color: #e3d2d2;"> </span><span class="n" style="color: #333;">xs</span><span class="p">))</span> <span class="n" style="color: #333;">b</span> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC31" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kr" style="font-weight: 600;"><span class="idiff">_</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vs</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">getField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="n" style="color: #333;"><span class="idiff">foo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">vs</span></span></span>
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<pre style="margin: 0;">+<span id="LC41" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vs</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="nf" style="color: #900; font-weight: 600;"><span class="idiff">\</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">-></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">:></span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">setField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="n" style="color: #333;"><span class="idiff">foo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vs</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">v</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">getField</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">@</span></span><span class="n" style="color: #333;"><span class="idiff">foo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">vs</span></span><span class="p"><span class="idiff right">)</span></span></span>
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32
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42
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"></span>
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33
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43
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="n" style="color: #333;">y</span> <span class="o" style="font-weight: 600;">~</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">IsLabel</span> <span class="n" style="color: #333;">y</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Label</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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34
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"> <span class="n" style="color: #333;">fromLabel</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Label</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">@@ -44,3 +54,4 @@ y = #bar := 'x' :> undefined</td>
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54
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<pre style="margin: 0;"> <span id="LC54" class="line" lang="haskell"><span class="s" style="color: #d14;">main = do print (#foo x)</span></span>
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55
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="haskell"><span class="s" style="color: #d14;"> print (#bar x)</span></span>
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46
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56
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="haskell"><span class="s" style="color: #d14;"> print (#bar y)</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="haskell"><span class="s" style="color: #d14;"> print (setField @"</span><span class="n" style="color: #333;">foo</span><span class="s" style="color: #d14;">" x 11)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#135e8a0266490b1431fb14c57e432df93198ff91"><strong>testsuite/tests/overloadedrecflds/should_run/overloadedrecfldsrun07.stdout</strong></a>
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<pre style="margin: 0;"> <span id="LC1" class="line" lang="plaintext">42</span>
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2
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">True</span>
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3
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3
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext">'x'</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext">#foo := 11 :> (#bar := True :> Nil)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#c7cbb518abd02952b7e40de417eb0ee3adf61a8c"><strong>testsuite/tests/parser/should_compile/T14189.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">@@ -134,6 +134,7 @@</td>
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134
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134
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<pre style="margin: 0;"> <span id="LC134" class="line" lang="plaintext"> (FieldLabel</span>
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135
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135
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="plaintext"> {FastString: "f"}</span>
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136
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136
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="plaintext"> (False)</span>
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137
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="plaintext"> (())</span>
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137
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138
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="plaintext"> {Name: T14189.f}))]))</span>
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138
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139
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<pre style="margin: 0;"> <span id="LC139" class="line" lang="plaintext"> [(AvailTC</span>
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139
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140
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<pre style="margin: 0;"> <span id="LC140" class="line" lang="plaintext"> {Name: T14189.MyType}</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">@@ -142,6 +143,7 @@</td>
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="plaintext"> [(FieldLabel</span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="plaintext"> {FastString: "f"}</span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="plaintext"> (False)</span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="plaintext"> (())</span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="plaintext"> {Name: T14189.f})])])])</span>
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148
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="plaintext"> (Nothing)))</span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="plaintext"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fd42d100ea2701fc103e7766262db3f793625cd5...d32a697da0445cdda59ac72fa23fb54b8952475f#7d1b5953972c83695e1e7fa7817b5e4e95fffb61"><strong>testsuite/tests/typecheck/should_fail/T17355.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">@@ -8,4 +8,4 @@ data Foo = Foo { poly :: forall a. a -> a }</td>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="haskell"></span>
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9
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">Generic</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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10
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">instance</span> <span class="kt" style="color: #458; font-weight: 600;">HasField</span> <span class="s" style="color: #d14;">"myPoly"</span> <span class="kt" style="color: #458; font-weight: 600;">Foo</span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</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="LC11" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">getField</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Foo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">x</span></span></span></pre>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"> <span class="n" style="color: #333;"><span class="idiff left">hasField</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff">Foo</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff">)</span></span><span class="idiff"> </span><span class="o" style="font-weight: 600;"><span class="idiff">=</span></span><span class="idiff"> </span><span class="p"><span class="idiff">(</span></span><span class="n" style="color: #333;"><span class="idiff">undefined</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x</span></span><span class="p"><span class="idiff right">)</span></span></span></pre>
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