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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>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2c5a8f22da85425921048c9d3d7ae0eebc7af56c">2c5a8f22</a></strong>
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<span>by Adam Gundry</span>
<i>at 2020-09-16T22:39:40+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Rewrite matchHasField to generate evidence more directly
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/a03af1504b3cb178a070f58a2afefa681ad37f07">a03af150</a></strong>
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<span>by Adam Gundry</span>
<i>at 2020-09-16T23:08:51+01:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Notes and Queries
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<h4>3 changed files:</h4>
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<li class="file-stats">
<a href="#aebe2c3d616f6843166d2657bed048898add6bc9">
compiler/GHC/Tc/Instance/Class.hs
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<li class="file-stats">
<a href="#5ed3ecf19a26af612b8100b2639f8e153f580fe9">
compiler/GHC/Tc/TyCl/Utils.hs
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<li class="file-stats">
<a href="#e995173a19cd0878fdecbafad6e371fc293fd878">
compiler/GHC/Types/FieldLabel.hs
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<h4>Changes:</h4>
<li id="aebe2c3d616f6843166d2657bed048898add6bc9">
<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fdff0fe1834729148842ac0d7b94e68a9c916466...a03af1504b3cb178a070f58a2afefa681ad37f07#aebe2c3d616f6843166d2657bed048898add6bc9"><strong>compiler/GHC/Tc/Instance/Class.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">@@ -44,7 +44,7 @@ import GHC.Core.Class</td>
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<pre style="margin: 0;"> <span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Driver.Session</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Outputable</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Panic</span></span>
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<pre style="margin: 0;">-<span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span><span class="p">(</span> <span class="n" style="color: #333;">splitAtList</span><span class="p">,</span> <span class="n" style="color: #333;">fstOf3</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Utils.Misc</span><span class="p">(</span> <span class="n" style="color: #333;">splitAtList</span><span class="p">,</span> <span class="n" style="color: #333;">fstOf3</span><span class="p"><span class="idiff left">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">debugIsOn</span></span> <span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- *******************************************************************</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="606" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -606,6 +606,7 @@ matchCoercible args = pprPanic "matchLiftedCoercible" (ppr args)</td>
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<pre style="margin: 0;"> <span id="LC606" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{-</span></span>
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<pre style="margin: 0;"> <span id="LC607" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [HasField instances]</span></span>
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<pre style="margin: 0;"> <span id="LC608" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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<pre style="margin: 0;">+<span id="LC609" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC610" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Suppose we have</span></span>
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<pre style="margin: 0;"> <span id="LC611" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC612" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T y = MkT { foo :: [y] }</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="619" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="620" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -619,44 +620,56 @@ We want GHC to automatically solve a constraint like</td>
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<pre style="margin: 0;"> <span id="LC620" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC621" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> HasField "foo" (T Int) b</span></span>
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<pre style="margin: 0;"> <span id="LC622" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC622" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by emitting a new wanted</span></span>
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<pre style="margin: 0;">-<span id="LC623" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> (T alpha -> ([alpha] -> T alpha, [alpha])) ~# (T Int -> (b -> T Int, b))</span></span>
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<pre style="margin: 0;">+<span id="LC623" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">by building a HasField dictionary out of the updater function `$upd:foo:MKT`.</span></span>
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<pre style="margin: 0;">+<span id="LC624" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">(See Note [Record updaters] in GHC.Tc.TyCl.Utils for how updaters are built.)</span></span>
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<pre style="margin: 0;"> <span id="LC625" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and building a HasField dictionary out of the updater function `$upd:foo:MKT`.</span></span>
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<pre style="margin: 0;">-<span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See Note [Record updaters] in GHC.Tc.TyCl.Utils for how updaters are built.</span></span>
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<pre style="margin: 0;">+<span id="LC626" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If `foo` is not in scope, or has a higher-rank or existentially</span></span>
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<pre style="margin: 0;">+<span id="LC627" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">quantified type, then the constraint is not solved automatically, but</span></span>
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<pre style="margin: 0;">+<span id="LC628" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">may be solved by a user-supplied HasField instance. Similarly, if we</span></span>
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<pre style="margin: 0;">+<span id="LC629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">encounter a HasField constraint where the field is not a literal</span></span>
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<pre style="margin: 0;">+<span id="LC630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">string, or does not belong to the type, then we fall back on the</span></span>
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<pre style="margin: 0;">+<span id="LC631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">normal constraint solver behaviour.</span></span>
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<pre style="margin: 0;"> <span id="LC632" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC629" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Since HasField is a one-method class, it is represented as a newtype.</span></span>
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<pre style="margin: 0;">-<span id="LC630" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Hence we can solve `HasField "foo" (T Int) b` by taking an expression</span></span>
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<pre style="margin: 0;">-<span id="LC631" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">of type `T Int -> (b -> T Int, b)` and casting it using the newtype coercion.</span></span>
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<pre style="margin: 0;"> <span id="LC633" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that</span></span>
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<pre style="margin: 0;"> <span id="LC634" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC635" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $upd:foo:MKT :: forall y . T y -> ([y] -> T y, [y])</span></span>
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<pre style="margin: 0;"> <span id="LC636" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC636" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so the expression we construct is</span></span>
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<pre style="margin: 0;">+<span id="LC637" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so we instantiate the updater's type with fresh metavariable(s) (here just one,</span></span>
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<pre style="margin: 0;">+<span id="LC638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">namely alpha), emit new wanteds:</span></span>
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<pre style="margin: 0;">+<span id="LC640" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] data_co :: T alpha ~# T Int</span></span>
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<pre style="margin: 0;">+<span id="LC641" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> [W] fld_co :: [alpha] ~# b</span></span>
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<pre style="margin: 0;">+<span id="LC643" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">and construct the dictionary</span></span>
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<pre style="margin: 0;">-<span id="LC638" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $upd:foo:MKT @alpha |> co</span></span>
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<pre style="margin: 0;">+<span id="LC645" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ev :: HasField "foo" (T Int) b</span></span>
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<pre style="margin: 0;">+<span id="LC646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> ev = $upd:foo:MKT @alpha |> co</span></span>
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<pre style="margin: 0;"> <span id="LC648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where</span></span>
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<pre style="margin: 0;"> <span id="LC650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co :: (T alpha -> ([alpha] -> T alpha, [alpha])) ~# HasField "foo" (T Int) b</span></span>
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<pre style="margin: 0;">+<span id="LC651" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co = sym nt_co ; hf_co</span></span>
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<pre style="margin: 0;">-<span id="LC644" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">is built from</span></span>
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<pre style="margin: 0;">+<span id="LC653" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> -- From the instantiated newtype coercion, since HasField is a single-method type class</span></span>
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<pre style="margin: 0;">+<span id="LC654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> nt_co :: HasField "foo" (T alpha) [alpha] ~# (T alpha -> ([alpha] -> T alpha, [alpha]))</span></span>
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<pre style="margin: 0;">-<span id="LC646" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co1 :: (T alpha -> ([alpha] -> T alpha, [alpha])) ~# (T Int -> (b -> T Int, b))</span></span>
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<pre style="margin: 0;">+<span id="LC656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> hf_co :: HasField "foo" (T alpha) [alpha] ~# HasField "foo" (T Int) b</span></span>
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<pre style="margin: 0;">+<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> hf_co = HasField <"foo"> data_co fld_co</span></span>
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<pre style="margin: 0;">-<span id="LC648" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which is the new wanted, and</span></span>
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<pre style="margin: 0;"> <span id="LC659" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC650" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> co2 :: (T Int -> (b -> T Int, b)) ~# HasField "foo" (T Int) b</span></span>
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<pre style="margin: 0;">+<span id="LC660" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Looking at the wanted T alpha ~# T Int, you might think that we could avoid</span></span>
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<pre style="margin: 0;">+<span id="LC661" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiating the updater's type with fresh metavariables, and instead construct</span></span>
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<pre style="margin: 0;">+<span id="LC662" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">a substitution [Int/alpha] directly. However this would not work for GADTs, for</span></span>
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<pre style="margin: 0;">+<span id="LC663" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">example:</span></span>
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<pre style="margin: 0;"> <span id="LC664" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC652" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">which can be derived from the newtype coercion.</span></span>
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<pre style="margin: 0;">+<span id="LC665" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data S a where</span></span>
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<pre style="margin: 0;">+<span id="LC666" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> MkS :: { foo :: Either p q } -> S (p,q)</span></span>
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<pre style="margin: 0;"> <span id="LC667" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC654" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If `foo` is not in scope, or has a higher-rank or existentially</span></span>
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<pre style="margin: 0;">-<span id="LC655" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">quantified type, then the constraint is not solved automatically, but</span></span>
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<pre style="margin: 0;">-<span id="LC656" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">may be solved by a user-supplied HasField instance. Similarly, if we</span></span>
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<pre style="margin: 0;">-<span id="LC657" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">encounter a HasField constraint where the field is not a literal</span></span>
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<pre style="margin: 0;">-<span id="LC658" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">string, or does not belong to the type, then we fall back on the</span></span>
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<pre style="margin: 0;">-<span id="LC659" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">normal constraint solver behaviour.</span></span>
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<pre style="margin: 0;">+<span id="LC668" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">where the updater's type is</span></span>
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<pre style="margin: 0;">+<span id="LC669" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC670" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $upd:foo:MkS :: forall p q. S (p,q) -> (Either p q -> S (p,q), Either p q)</span></span>
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<pre style="margin: 0;">+<span id="LC671" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC672" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">with no direct connection to the parameters of S itself.</span></span>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span>
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC675" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [HasField instances]</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">@@ -666,50 +679,81 @@ matchHasField dflags short_cut clas tys</td>
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<pre style="margin: 0;"> <span id="LC679" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">rdr_env</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getGlobalRdrEnv</span></span>
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680
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<pre style="margin: 0;"> <span id="LC680" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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668
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681
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<pre style="margin: 0;"> <span id="LC681" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We are matching HasField {k} x r a...</span></span>
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<pre style="margin: 0;">-<span id="LC669" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;"><span class="idiff left">_k_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">x_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">r_ty</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">a_ty</span></span><span class="p">]</span></span>
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<pre style="margin: 0;">-<span id="LC670" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- x should be a literal string</span></span>
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<pre style="margin: 0;">-<span id="LC671" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">x</span><span class="idiff left"> </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">isStrLitTy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">x_ty</span></span></span>
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682
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<pre style="margin: 0;">+<span id="LC682" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;"><span class="idiff left">k</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">,</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="n" style="color: #333;"><span class="idiff right">a</span></span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC683" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- x should be a literal string<span class="idiff left right"> (this implies k is Symbol)</span></span></span>
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684
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<pre style="margin: 0;">+<span id="LC684" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">x<span class="idiff left">_lit</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">isStrLitTy</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">x</span></span></span>
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685
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<pre style="margin: 0;"> <span id="LC685" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- r should be an applied type constructor</span></span>
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<pre style="margin: 0;">-<span id="LC673" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">r<span class="idiff left right">_ty</span></span></span>
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<pre style="margin: 0;">+<span id="LC686" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="n" style="color: #333;">tc</span><span class="p">,</span> <span class="n" style="color: #333;">args</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcSplitTyConApp_maybe</span> <span class="n" style="color: #333;">r</span></span>
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<pre style="margin: 0;"> <span id="LC687" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- use representation tycon (if data family); it has the fields</span></span>
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="haskell"> <span class="p">,</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">r_tc</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fstOf3</span> <span class="p">(</span><span class="n" style="color: #333;">tcLookupDataFamInst</span> <span class="n" style="color: #333;">fam_inst_envs</span> <span class="n" style="color: #333;">tc</span> <span class="n" style="color: #333;">args</span><span class="p">)</span></span>
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676
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- x should be a field of r</span></span>
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677
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<pre style="margin: 0;">-<span id="LC677" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupTyConFieldLabel</span> <span class="n" style="color: #333;">x</span> <span class="n" style="color: #333;">r_tc</span></span>
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<pre style="margin: 0;">+<span id="LC690" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">fl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupTyConFieldLabel</span> <span class="n" style="color: #333;">x<span class="idiff left right">_lit</span></span> <span class="n" style="color: #333;">r_tc</span></span>
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678
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691
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<pre style="margin: 0;"> <span id="LC691" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the field selector should be in scope</span></span>
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679
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692
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="n" style="color: #333;">gre</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">lookupGRE_FieldLabel</span> <span class="n" style="color: #333;">rdr_env</span> <span class="n" style="color: #333;">fl</span></span>
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680
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693
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="haskell"></span>
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681
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<pre style="margin: 0;">-<span id="LC681" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">upd_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookupId</span> <span class="p">(</span><span class="n" style="color: #333;">flUpdate</span> <span class="n" style="color: #333;">fl</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC682" class="line" lang="haskell"> <span class="p">;</span> <span class="p">(</span><span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">preds</span><span class="p">,</span> <span class="n" style="color: #333;">upd_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstType</span> <span class="n" style="color: #333;">newMetaTyVars</span> <span class="n" style="color: #333;">upd_id</span></span>
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<pre style="margin: 0;">-<span id="LC683" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC684" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The first new wanted constraint equates the actual</span></span>
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<pre style="margin: 0;">-<span id="LC685" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type of the updater with the type (r -> (a -> r, a))</span></span>
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686
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<pre style="margin: 0;">-<span id="LC686" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- within the HasField x r a dictionary. The preds</span></span>
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687
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<pre style="margin: 0;">-<span id="LC687" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- will typically be empty, but if the datatype has a</span></span>
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688
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<pre style="margin: 0;">-<span id="LC688" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- "stupid theta" then we have to include it here.</span></span>
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689
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<pre style="margin: 0;">-<span id="LC689" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimEqPred</span> <span class="n" style="color: #333;">upd_ty</span> <span class="p">(</span><span class="n" style="color: #333;">mkVisFunTyMany</span> <span class="n" style="color: #333;">r_ty</span> <span class="p">(</span><span class="n" style="color: #333;">mkBoxedTupleTy</span> <span class="p">[</span><span class="n" style="color: #333;">mkVisFunTyMany</span> <span class="n" style="color: #333;">a_ty</span> <span class="n" style="color: #333;">r_ty</span><span class="p">,</span> <span class="n" style="color: #333;">a_ty</span><span class="p">]))</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">preds</span></span>
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690
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<pre style="margin: 0;">-<span id="LC690" class="line" lang="haskell"></span>
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691
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<pre style="margin: 0;">-<span id="LC691" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use the equality proof to cast the updater Id to</span></span>
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692
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<pre style="margin: 0;">-<span id="LC692" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- type (r -> (a -> r, a)), then use the newtype</span></span>
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<pre style="margin: 0;">-<span id="LC693" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- coercion to cast it to a HasField dictionary.</span></span>
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<pre style="margin: 0;">-<span id="LC694" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ev</span> <span class="p">(</span><span class="n" style="color: #333;">ev1</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">evs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">evSelector</span> <span class="n" style="color: #333;">upd_id</span> <span class="n" style="color: #333;">tvs</span> <span class="n" style="color: #333;">evs</span> <span class="p">`</span><span class="n" style="color: #333;">evCast</span><span class="p">`</span> <span class="n" style="color: #333;">co</span></span>
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695
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<pre style="margin: 0;">-<span id="LC695" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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696
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<pre style="margin: 0;">-<span id="LC696" class="line" lang="haskell"> <span class="n" style="color: #333;">co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcSubCo</span> <span class="p">(</span><span class="n" style="color: #333;">evTermCoercion</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvExpr</span> <span class="n" style="color: #333;">ev1</span><span class="p">))</span></span>
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697
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<pre style="margin: 0;">-<span id="LC697" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">co2</span></span>
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698
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<pre style="margin: 0;">-<span id="LC698" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ev</span> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"matchHasField.mk_ev"</span></span>
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699
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<pre style="margin: 0;">-<span id="LC699" class="line" lang="haskell"></span>
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700
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<pre style="margin: 0;">-<span id="LC700" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">co2</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcInstNewTyCon_maybe</span> <span class="p">(</span><span class="n" style="color: #333;">classTyCon</span> <span class="n" style="color: #333;">clas</span><span class="p">)</span></span>
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701
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<pre style="margin: 0;">-<span id="LC701" class="line" lang="haskell"> <span class="n" style="color: #333;">tys</span></span>
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702
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<pre style="margin: 0;">-<span id="LC702" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC703" class="line" lang="haskell"> <span class="n" style="color: #333;">tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTys</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC704" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC694" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ASSERT</span> <span class="p">(</span> <span class="n" style="color: #333;">k</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">typeSymbolKind</span> <span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC695" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Look up the updater and instantiate its type with fresh metavars</span></span>
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<pre style="margin: 0;">+<span id="LC696" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">upd_id</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcLookupId</span> <span class="p">(</span><span class="n" style="color: #333;">flUpdate</span> <span class="n" style="color: #333;">fl</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC697" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">inst_upd</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">upd_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcInstType</span> <span class="n" style="color: #333;">newMetaTyVars</span> <span class="n" style="color: #333;">upd_id</span></span>
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<pre style="margin: 0;"> <span id="LC698" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Do not generate an instance if the updater cannot be</span></span>
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<pre style="margin: 0;"> <span id="LC699" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- defined for the field and hence is (). (See Note</span></span>
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<pre style="margin: 0;"> <span id="LC700" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- [Naughty record updaters] in GHC.Tc.TyCl.Utils.)</span></span>
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">if</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">upd_ty</span> <span class="p">`</span><span class="n" style="color: #333;">eqType</span><span class="p">`</span> <span class="n" style="color: #333;">unitTy</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">then</span> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="n" style="color: #333;">addUsedGRE</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">gre</span></span>
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<pre style="margin: 0;">-<span id="LC710" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="kt" style="color: #458; font-weight: 600;">OneInst</span> <span class="p">{</span> <span class="n" style="color: #333;">cir_new_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;">-<span id="LC711" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cir_mk_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_ev</span></span>
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<pre style="margin: 0;">-<span id="LC712" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cir_what</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BuiltinInstance</span> <span class="p">}</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC703" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkHasFieldEvidence</span> <span class="n" style="color: #333;">clas</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">r</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="LC704" class="line" lang="haskell"> <span class="n" style="color: #333;">upd_id</span> <span class="n" style="color: #333;">inst_upd</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">else</span> <span class="n" style="color: #333;">matchInstEnv</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">short_cut</span> <span class="n" style="color: #333;">clas</span> <span class="n" style="color: #333;">tys</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">matchInstEnv</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">short_cut</span> <span class="n" style="color: #333;">clas</span> <span class="n" style="color: #333;">tys</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC708" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC709" class="line" lang="haskell"><span class="cd">-- | Build the dictionary for a @HasField x r a@ constraint using its updater.</span></span>
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<pre style="margin: 0;">+<span id="LC710" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- See Note [HasField instances].</span></span>
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<pre style="margin: 0;">+<span id="LC711" class="line" lang="haskell"><span class="n" style="color: #333;">mkHasFieldEvidence</span></span>
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<pre style="margin: 0;">+<span id="LC712" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Class</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ HasField class</span></span>
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<pre style="margin: 0;">+<span id="LC713" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ (x, r, a) type parameters of HasField constraint</span></span>
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<pre style="margin: 0;">+<span id="LC714" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Id</span> <span class="c1" style="color: #998; font-style: italic;">-- ^ Updater Id $upd:x:...</span></span>
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<pre style="margin: 0;">+<span id="LC715" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="p">([(</span><span class="kt" style="color: #458; font-weight: 600;">Name</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcTyVar</span><span class="p">)],</span> <span class="kt" style="color: #458; font-weight: 600;">TcThetaType</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">TcType</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC716" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- ^ (tyvars, preds, rho) from instantiating the updater's type</span></span>
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<pre style="margin: 0;">+<span id="LC717" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ClsInstResult</span></span>
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<pre style="margin: 0;">+<span id="LC718" class="line" lang="haskell"><span class="n" style="color: #333;">mkHasFieldEvidence</span> <span class="n" style="color: #333;">clas</span> <span class="p">(</span><span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">r</span><span class="p">,</span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="n" style="color: #333;">upd_id</span> <span class="p">(</span><span class="n" style="color: #333;">tv_prs</span><span class="p">,</span> <span class="n" style="color: #333;">preds</span><span class="p">,</span> <span class="n" style="color: #333;">upd_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC719" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">OneInst</span> <span class="p">{</span> <span class="n" style="color: #333;">cir_new_theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">theta</span></span>
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<pre style="margin: 0;">+<span id="LC720" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cir_mk_ev</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mk_ev</span></span>
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<pre style="margin: 0;">+<span id="LC721" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">cir_what</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">BuiltinInstance</span> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC722" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC723" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Updater types satisfy by construction</span></span>
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<pre style="margin: 0;">+<span id="LC724" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- upd_ty = (data_ty -> (fld_ty -> data_ty, fld_ty))</span></span>
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<pre style="margin: 0;">+<span id="LC725" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- where data_ty is the datatype and fld_ty is the field type.</span></span>
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<pre style="margin: 0;">+<span id="LC726" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">data_ty</span><span class="p">,</span> <span class="n" style="color: #333;">setter_field_pair</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitFunTy</span> <span class="n" style="color: #333;">upd_ty</span></span>
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<pre style="margin: 0;">+<span id="LC727" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="p">[</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">fld_ty</span><span class="p">])</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">splitTyConApp</span> <span class="n" style="color: #333;">setter_field_pair</span></span>
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<pre style="margin: 0;">+<span id="LC728" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC729" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Emit new wanteds in order to convert `HasField x data_ty fld_ty` (built</span></span>
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<pre style="margin: 0;">+<span id="LC730" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- from the updater) into `HasField x r a` (the constraint we are solving).</span></span>
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<pre style="margin: 0;">+<span id="LC731" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The preds will typically be empty, but if the datatype has a "stupid</span></span>
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<pre style="margin: 0;">+<span id="LC732" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- theta" it will be included here, as the updater quantifies over it.</span></span>
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<pre style="margin: 0;">+<span id="LC733" class="line" lang="haskell"> <span class="n" style="color: #333;">theta</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkPrimEqPred</span> <span class="n" style="color: #333;">data_ty</span> <span class="n" style="color: #333;">r</span> <span class="c1" style="color: #998; font-style: italic;">-- data_co :: data_ty ~# r</span></span>
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<pre style="margin: 0;">+<span id="LC734" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">mkPrimEqPred</span> <span class="n" style="color: #333;">fld_ty</span> <span class="n" style="color: #333;">a</span> <span class="c1" style="color: #998; font-style: italic;">-- fld_co :: fld_ty ~# a</span></span>
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<pre style="margin: 0;">+<span id="LC735" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">preds</span></span>
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<pre style="margin: 0;">+<span id="LC736" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC737" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Instantiate the updater Id appropriately, use the newtype coercion to</span></span>
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<pre style="margin: 0;">+<span id="LC738" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- cast it to a `HasField x data_ty fld_ty` dictionary, then use the</span></span>
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<pre style="margin: 0;">+<span id="LC739" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- equality witnesses to convert it to a `HasField x r a` dictionary.</span></span>
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<pre style="margin: 0;">+<span id="LC740" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ev</span> <span class="p">(</span><span class="n" style="color: #333;">data_co</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">fld_co</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">evs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span></span>
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741
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<pre style="margin: 0;">+<span id="LC741" class="line" lang="haskell"> <span class="n" style="color: #333;">evSelector</span> <span class="n" style="color: #333;">upd_id</span> <span class="p">(</span><span class="n" style="color: #333;">mkTyVarTys</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">snd</span> <span class="n" style="color: #333;">tv_prs</span><span class="p">))</span> <span class="n" style="color: #333;">evs</span></span>
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<pre style="margin: 0;">+<span id="LC742" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">evCast</span><span class="p">`</span> <span class="p">(</span><span class="n" style="color: #333;">mkTcSymCo</span> <span class="n" style="color: #333;">nt_co</span> <span class="p">`</span><span class="n" style="color: #333;">mkTcTransCo</span><span class="p">`</span> <span class="n" style="color: #333;">hf_co</span> <span class="n" style="color: #333;">data_co</span> <span class="n" style="color: #333;">fld_co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC743" class="line" lang="haskell"> <span class="n" style="color: #333;">mk_ev</span> <span class="n" style="color: #333;">evs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">pprPanic</span> <span class="s" style="color: #d14;">"mkHasFieldEvidence.mk_ev"</span> <span class="p">(</span><span class="n" style="color: #333;">ppr</span> <span class="n" style="color: #333;">evs</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC744" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC745" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hf_co :: HasField x data_ty fld_ty ~# HasField x r a</span></span>
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<pre style="margin: 0;">+<span id="LC746" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- hf_co = HasField <x> data_co fld_co</span></span>
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<pre style="margin: 0;">+<span id="LC747" class="line" lang="haskell"> <span class="n" style="color: #333;">hf_co</span> <span class="n" style="color: #333;">data_co</span> <span class="n" style="color: #333;">fld_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTcTyConAppCo</span> <span class="kt" style="color: #458; font-weight: 600;">Representational</span> <span class="n" style="color: #333;">hasFieldTyCon</span></span>
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<pre style="margin: 0;">+<span id="LC748" class="line" lang="haskell"> <span class="p">[</span> <span class="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">typeSymbolKind</span></span>
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<pre style="margin: 0;">+<span id="LC749" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">mkTcNomReflCo</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC750" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">evTermCoercion</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvExpr</span> <span class="n" style="color: #333;">data_co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC751" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">evTermCoercion</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">EvExpr</span> <span class="n" style="color: #333;">fld_co</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC752" class="line" lang="haskell"> <span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC754" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- nt_co :: HasField x data_ty fld_ty ~# (data_ty -> (fld_ty -> data_ty, fld_ty))</span></span>
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<pre style="margin: 0;">+<span id="LC755" class="line" lang="haskell"> <span class="n" style="color: #333;">nt_co</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">maybe</span> <span class="p">(</span><span class="n" style="color: #333;">panic</span> <span class="s" style="color: #d14;">"mkHasFieldEvidence:nt_co"</span><span class="p">)</span> <span class="n" style="color: #333;">snd</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC756" class="line" lang="haskell"> <span class="n" style="color: #333;">tcInstNewTyCon_maybe</span> <span class="n" style="color: #333;">hasFieldTyCon</span></span>
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<pre style="margin: 0;">+<span id="LC757" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">typeSymbolKind</span><span class="p">,</span> <span class="n" style="color: #333;">x</span><span class="p">,</span> <span class="n" style="color: #333;">data_ty</span><span class="p">,</span> <span class="n" style="color: #333;">fld_ty</span><span class="p">]</span></span>
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<pre style="margin: 0;">+<span id="LC759" class="line" lang="haskell"> <span class="n" style="color: #333;">hasFieldTyCon</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">classTyCon</span> <span class="n" style="color: #333;">clas</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fdff0fe1834729148842ac0d7b94e68a9c916466...a03af1504b3cb178a070f58a2afefa681ad37f07#5ed3ecf19a26af612b8100b2639f8e153f580fe9"><strong>compiler/GHC/Tc/TyCl/Utils.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">@@ -1183,6 +1183,14 @@ type (e.g. 'b' in T2).</td>
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<pre style="margin: 0;"> <span id="LC1183" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1184" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note the need for casts in the result!</span></span>
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<pre style="margin: 0;"> <span id="LC1185" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1186" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">All this applies to updaters (see Note [Record updaters]) as well as selectors;</span></span>
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<pre style="margin: 0;">+<span id="LC1187" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">in the example above we will build this updater:</span></span>
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<pre style="margin: 0;">+<span id="LC1188" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $upd:f:T1 :: T [a] -> (Maybe a -> T [a], Maybe a)</span></span>
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1189
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<pre style="margin: 0;">+<span id="LC1189" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1190" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If a GADT field has bona-fide existential tyvars that do not appear in the</span></span>
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<pre style="margin: 0;">+<span id="LC1191" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">result type, the selector will be naughty (see Note [Naughty record selectors]).</span></span>
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1192
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<pre style="margin: 0;">+<span id="LC1192" class="line" lang="haskell"></span>
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1193
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<pre style="margin: 0;">+<span id="LC1193" class="line" lang="haskell"></span>
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1194
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<pre style="margin: 0;"> <span id="LC1194" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Selector running example]</span></span>
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1187
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1195
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<pre style="margin: 0;"> <span id="LC1195" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1188
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1196
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<pre style="margin: 0;"> <span id="LC1196" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">It's OK to combine GADTs and type families. Here's a running example:</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">@@ -1268,7 +1276,7 @@ Note that:</td>
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1268
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1276
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<pre style="margin: 0;"> <span id="LC1276" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> scope.</span></span>
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1269
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1277
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<pre style="margin: 0;"> <span id="LC1277" class="line" lang="haskell"></span>
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1270
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1278
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<pre style="margin: 0;"> <span id="LC1278" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * The Name of each updater is stored alongside that of the selector in the</span></span>
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1271
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<pre style="margin: 0;">-<span id="LC1271" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'FieldLabel's in each 'DataCon'.</span></span>
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1279
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<pre style="margin: 0;">+<span id="LC1279" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 'FieldLabel's in each 'DataCon'.<span class="idiff left right"> See the notes in GHC.Types.FieldLabel.</span></span></span>
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1272
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1280
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<pre style="margin: 0;"> <span id="LC1280" class="line" lang="haskell"></span>
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1273
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1281
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<pre style="margin: 0;"> <span id="LC1281" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * Renamed-syntax bindings for both a selector and an updater for each field are</span></span>
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1274
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1282
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<pre style="margin: 0;"> <span id="LC1282" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> produced by mkRecordSelectorAndUpdater; these bindings are then type-checked</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">@@ -1285,6 +1293,16 @@ Note that:</td>
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1285
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1293
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<pre style="margin: 0;"> <span id="LC1293" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> name to () instead, even if we can generate the corresponding selector. See</span></span>
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1286
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1294
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<pre style="margin: 0;"> <span id="LC1294" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> Note [Naughty record updaters].</span></span>
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1295
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<pre style="margin: 0;"> <span id="LC1295" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1296" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * We could imagine generating the selector *from* the updater, i.e. build</span></span>
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<pre style="margin: 0;">+<span id="LC1297" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> $sel:foo:T r = case $upd:foo:T r of (_, x) -> x</span></span>
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<pre style="margin: 0;">+<span id="LC1298" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> but we don't do so because the updater might be naughty, and for pattern</span></span>
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<pre style="margin: 0;">+<span id="LC1299" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> synonyms will not exist at all (see Note [No updaters for pattern synonyms]).</span></span>
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1300
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<pre style="margin: 0;">+<span id="LC1300" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1301" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> * For GADTs, we insist that all constructors mentioning a field have the same</span></span>
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<pre style="margin: 0;">+<span id="LC1302" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type, and reject the definition entirely if not. Thus if the field does not</span></span>
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<pre style="margin: 0;">+<span id="LC1303" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> involve an existential (and hence is not naughty) we can make both a selector</span></span>
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<pre style="margin: 0;">+<span id="LC1304" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> and an updater (see Note [GADT record selectors]).</span></span>
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1305
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<pre style="margin: 0;">+<span id="LC1305" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1306" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1307" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Naughty record updaters]</span></span>
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<pre style="margin: 0;"> <span id="LC1308" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</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">@@ -1332,7 +1350,9 @@ do this at HasField constraint solving time instead, at least for updaters?</td>
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1350
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<pre style="margin: 0;"> <span id="LC1350" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [No updaters for pattern synonyms]</span></span>
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1351
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<pre style="margin: 0;"> <span id="LC1351" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1352
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<pre style="margin: 0;"> <span id="LC1352" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">For record pattern synonyms, we generate a selector function, but not an</span></span>
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1335
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<pre style="margin: 0;">-<span id="LC1335" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">updater. The updater function is not necessary because we do not solve HasField</span></span>
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<pre style="margin: 0;">+<span id="LC1353" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">updater. In principle it would be possible to build an updater for</span></span>
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<pre style="margin: 0;">+<span id="LC1354" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bidirectional pattern synonyms, but not for unidirectional ones. In any case,</span></span>
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1355
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<pre style="margin: 0;">+<span id="LC1355" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the updater function is not necessary because we do not solve HasField</span></span>
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<pre style="margin: 0;"> <span id="LC1356" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraints for fields defined by pattern synonyms.</span></span>
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1337
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<pre style="margin: 0;"> <span id="LC1357" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">That is, given</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">@@ -1355,10 +1375,11 @@ which will be subject to the usual rules around orphan instances and the</td>
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<pre style="margin: 0;"> <span id="LC1375" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">restrictions on when HasField instances can be defined (as described in</span></span>
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<pre style="margin: 0;"> <span id="LC1376" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Validity checking of HasField instances] in GHC.Tc.Validity).</span></span>
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1357
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<pre style="margin: 0;"> <span id="LC1377" class="line" lang="haskell"></span>
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1358
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<pre style="margin: 0;">-<span id="LC1358" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We could imagine allowing record pattern synonyms to lead to automatic HasField</span></span>
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1359
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<pre style="margin: 0;">-<span id="LC1359" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">constraint solving, but this potentially introduces incoherent HasField</span></span>
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<pre style="margin: 0;">-<span id="LC1360" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instances, because multiple pattern synonyms (in different modules) might use</span></span>
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1361
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<pre style="margin: 0;">-<span id="LC1361" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the same field name in the same type, and would even lead to e.g.</span></span>
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<pre style="margin: 0;">+<span id="LC1378" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We could imagine allowing (bidirectional) record pattern synonyms to lead to</span></span>
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<pre style="margin: 0;">+<span id="LC1379" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">automatic HasField constraint solving, but this potentially introduces</span></span>
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<pre style="margin: 0;">+<span id="LC1380" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">incoherent HasField instances, because multiple pattern synonyms (in different</span></span>
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<pre style="margin: 0;">+<span id="LC1381" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">modules) might use the same field name in the same type, and would even lead to</span></span>
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1382
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<pre style="margin: 0;">+<span id="LC1382" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">e.g.</span></span>
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1362
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1383
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<pre style="margin: 0;"> <span id="LC1383" class="line" lang="haskell"></span>
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1384
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<pre style="margin: 0;"> <span id="LC1384" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> pattern Id{id} = id</span></span>
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1364
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1385
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<pre style="margin: 0;"> <span id="LC1385" class="line" lang="haskell"></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/compare/fdff0fe1834729148842ac0d7b94e68a9c916466...a03af1504b3cb178a070f58a2afefa681ad37f07#e995173a19cd0878fdecbafad6e371fc293fd878"><strong>compiler/GHC/Types/FieldLabel.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">@@ -40,6 +40,11 @@ Now there will be two FieldLabel values for 'foo', one in T and one in</td>
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<pre style="margin: 0;"> <span id="LC40" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">U. They share the same label (FieldLabelString), but the selector</span></span>
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41
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">functions differ.</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC43" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There is no Deep and Subtle Reason why we couldn't use mangled $sel: names for</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">all selectors, not just those defined when DuplicateRecordFields is enabled.</span></span>
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<pre style="margin: 0;">+<span id="LC45" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">However, this exposes various bugs in the DuplicateRecordFields implementation,</span></span>
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<pre style="margin: 0;">+<span id="LC46" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">so we have not yet made this simplification.</span></span>
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<pre style="margin: 0;">+<span id="LC47" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">See also Note [Representing fields in AvailInfo] in GHC.Types.Avail.</span></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Why selector names include data constructors]</span></span>
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