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<h3>
Richard Eisenberg pushed to branch wip/derived-refactor
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/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d">d57c9cdb</a></strong>
<div>
<span>by Richard Eisenberg</span>
<i>at 2020-07-28T00:09:05-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Embrace oclose.
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<h4>19 changed files:</h4>
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<a href="#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
compiler/GHC/Tc/Errors.hs
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<li class="file-stats">
<a href="#1e879f291ac1d1f5e494e0bd8418867afe3d2869">
compiler/GHC/Tc/Instance/FunDeps.hs
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<li class="file-stats">
<a href="#54436e21ea530a66a8a71bcc01c836f4740b8f02">
compiler/GHC/Tc/Solver.hs
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<li class="file-stats">
<a href="#0c6b585a8a21f8340a85ca2cef89c4b1bf5a8953">
compiler/GHC/Tc/Solver/Monad.hs
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<a href="#a4496b3af737985647e6efff2bc6d49eafe376ed">
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testsuite/tests/typecheck/should_compile/T18398.stderr
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<a href="#5693caa348a03a8f7ef0d53f8cbb0d949a640db3">
testsuite/tests/typecheck/should_compile/T7220a.stderr
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<li class="file-stats">
<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<li class="file-stats">
<a href="#666f7d6000ff54754c94c22deb5616f72df2a658">
testsuite/tests/typecheck/should_fail/FD1.hs
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<a href="#3ef98634a1bdeb088e72b4c97ff5d75a30ba8198">
testsuite/tests/typecheck/should_fail/FD1.stderr
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<a href="#aa0069afd943eaf94dac358f5c78d93ab7c32a2e">
testsuite/tests/typecheck/should_fail/FD2.stderr
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<a href="#060715794b303bc374b298774c4afb7656d6ae26">
testsuite/tests/typecheck/should_fail/T10194.stderr
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<a href="#55ac31401970ee88a9f47f5d0a7aa72dac43706a">
testsuite/tests/typecheck/should_fail/T11514.stderr
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<a href="#d7828a6e3c388180539d24ecfca77525211f48ec">
testsuite/tests/typecheck/should_fail/T12563.stderr
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<a href="#20113928cc39af49e4c89479c9a680c352e8e69f">
testsuite/tests/typecheck/should_fail/T12589.stderr
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<a href="#7af70b7d95f7067b0d710c49f910b56ee55e9d96">
testsuite/tests/typecheck/should_compile/T18398.hs
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testsuite/tests/typecheck/should_fail/T18398.hs
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testsuite/tests/typecheck/should_fail/T18398.stderr
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<a href="#742906431d015b925266b35e585ba41d5a05e00f">
testsuite/tests/typecheck/should_compile/T18406.hs
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testsuite/tests/typecheck/should_fail/T18406.hs
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testsuite/tests/typecheck/should_fail/T18406.stderr
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<a href="#b9e86d897a62509b0114d81d5e736630d6f68f43">
testsuite/tests/typecheck/should_fail/all.T
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<h4>Changes:</h4>
<li id="e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#e4b9d5e9d2de37561bfd06a2c97a5c924a1bab76"><strong>compiler/GHC/Tc/Errors.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">@@ -524,8 +524,14 @@ This only matters in instance declarations..</td>
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524
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<pre style="margin: 0;"> <span id="LC524" 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="LC525" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"><span class="cd">-- | A predicate with its arising location; used to encapsulate a constraint</span></span>
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527
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<pre style="margin: 0;">-<span id="LC527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that will give rise to a <span class="idiff left right">warning</span>.</span></span>
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<pre style="margin: 0;">+<span id="LC527" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- that will give rise to a <span class="idiff left right">diagnostic</span>.</span></span>
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<pre style="margin: 0;"> <span id="LC528" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">ErrorItem</span></span>
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<pre style="margin: 0;">+<span id="LC529" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- We could perhaps use Ct here (and indeed used to do exactly that), but</span></span>
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<pre style="margin: 0;">+<span id="LC530" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- having a separate type gives to denote errors-in-formation gives us</span></span>
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<pre style="margin: 0;">+<span id="LC531" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- a nice place to do pre-processing, such as calculating ei_suppress.</span></span>
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<pre style="margin: 0;">+<span id="LC532" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Perhaps some day, an ErrorItem could eventually evolve to contain</span></span>
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<pre style="margin: 0;">+<span id="LC533" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the error text (or some representation of it), so we can then have all</span></span>
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<pre style="margin: 0;">+<span id="LC534" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- the errors together when deciding which to report.</span></span>
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<pre style="margin: 0;"> <span id="LC535" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">EI</span> <span class="p">{</span> <span class="n" style="color: #333;">ei_pred</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">PredType</span> <span class="c1" style="color: #998; font-style: italic;">-- report about this</span></span>
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<pre style="margin: 0;"> <span id="LC536" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The ei_pred field will never be an unboxed equality with</span></span>
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<pre style="margin: 0;"> <span id="LC537" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- a (casted) tyvar on the right; this is guaranteed by the solver</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">@@ -666,9 +672,6 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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<pre style="margin: 0;"> <span id="LC672" class="line" lang="haskell"> <span class="n" style="color: #333;">suppress</span> <span class="n" style="color: #333;">item</span></span>
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<pre style="margin: 0;"> <span id="LC673" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Wanted</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ei_flavour</span> <span class="n" style="color: #333;">item</span></span>
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<pre style="margin: 0;"> <span id="LC674" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is_ww_fundep_item</span> <span class="n" style="color: #333;">item</span></span>
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<pre style="margin: 0;">-<span id="LC669" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- "RAE" || (not has_gadt_match_here &&</span></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;"> is_given_eq item (classifyPredType (ei_pred item)))</span></span>
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<pre style="margin: 0;">-<span id="LC671" 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="LC675" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span></span>
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<pre style="margin: 0;"> <span id="LC676" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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677
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<pre style="margin: 0;"> <span id="LC677" class="line" lang="haskell"></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">@@ -747,7 +750,7 @@ reportWanteds ctxt tc_lvl (WC { wc_simple = simples, wc_impl = implics</td>
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747
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<pre style="margin: 0;"> <span id="LC750" class="line" lang="haskell"> <span class="n" style="color: #333;">is_irred</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IrredPred</span> <span class="p">{})</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">True</span></span>
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748
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751
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<pre style="margin: 0;"> <span id="LC751" class="line" lang="haskell"> <span class="n" style="color: #333;">is_irred</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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749
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752
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<pre style="margin: 0;"> <span id="LC752" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC750" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See situation (<span class="idiff left right">2</span>) of Note [Suppress confusing errors]</span></span>
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<pre style="margin: 0;">+<span id="LC753" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See situation (<span class="idiff left right">1</span>) of Note [Suppress confusing errors]</span></span>
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<pre style="margin: 0;"> <span id="LC754" class="line" lang="haskell"> <span class="n" style="color: #333;">is_ww_fundep</span> <span class="n" style="color: #333;">item</span> <span class="kr" style="font-weight: 600;">_</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">is_ww_fundep_item</span> <span class="n" style="color: #333;">item</span></span>
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<pre style="margin: 0;"> <span id="LC755" class="line" lang="haskell"> <span class="n" style="color: #333;">is_ww_fundep_item</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">isWantedWantedFunDepOrigin</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">errorItemOrigin</span></span>
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<pre style="margin: 0;"> <span id="LC756" class="line" lang="haskell"></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">@@ -798,7 +801,7 @@ isTyFun_maybe ty = case tcSplitTyConApp_maybe ty of</td>
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<pre style="margin: 0;"> <span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Certain errors we might encounter are potentially confusing to users.</span></span>
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802
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<pre style="margin: 0;"> <span id="LC802" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">If there are any other errors to report, at all, we want to suppress these.</span></span>
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803
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<pre style="margin: 0;"> <span id="LC803" class="line" lang="haskell"></span>
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801
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<pre style="margin: 0;">-<span id="LC801" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which errors:</span></span>
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804
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<pre style="margin: 0;">+<span id="LC804" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Which errors<span class="idiff left right"> (only 1 case right now)</span>:</span></span>
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802
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805
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<pre style="margin: 0;"> <span id="LC805" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC806" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">1) Errors which arise from the interaction of two Wanted fun-dep constraints.</span></span>
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<pre style="margin: 0;"> <span id="LC807" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> 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">@@ -828,14 +831,6 @@ Which errors:</td>
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<pre style="margin: 0;"> <span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> both are givens, the error represents unreachable code. For</span></span>
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> a Given/Wanted case, see #9612.</span></span>
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC831" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">2) Errors which arise from given functional dependencies. Functional</span></span>
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<pre style="margin: 0;">-<span id="LC832" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> dependencies have no evidence, and so they are always Wanted -- we have no</span></span>
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<pre style="margin: 0;">-<span id="LC833" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> evidence to supply to build a Given. So we can have a Wanted that arises</span></span>
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834
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<pre style="margin: 0;">-<span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> from Givens. These can be surprising for users. However, we still must</span></span>
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835
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<pre style="margin: 0;">-<span id="LC835" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> report (in contrast to Note [Given errors]): the (non-existent) evidence</span></span>
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836
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<pre style="margin: 0;">-<span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> might have been used to rewrite another Wanted. If we fail to report, then</span></span>
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<pre style="margin: 0;">-<span id="LC837" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> we get an unfilled coercion hole. This happened in typecheck/should_fail/FD1.</span></span>
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<pre style="margin: 0;">-<span id="LC838" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Mechanism:</span></span>
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<pre style="margin: 0;"> <span id="LC835" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC836" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We use the `suppress` function within reportWanteds to filter out these two</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#1e879f291ac1d1f5e494e0bd8418867afe3d2869"><strong>compiler/GHC/Tc/Instance/FunDeps.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">@@ -551,6 +551,13 @@ oclose preds fixed_tvs</td>
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<pre style="margin: 0;"> <span id="LC551" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">tv_fds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fixed_tvs</span> <span class="c1" style="color: #998; font-style: italic;">-- Fast escape hatch for common case.</span></span>
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<pre style="margin: 0;"> <span id="LC552" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">fixVarSet</span> <span class="n" style="color: #333;">extend</span> <span class="n" style="color: #333;">fixed_tvs</span></span>
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<pre style="margin: 0;"> <span id="LC553" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">+<span id="LC554" class="line" lang="haskell"> <span class="n" style="color: #333;">non_ip_preds</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterOut</span> <span class="n" style="color: #333;">isIPPred</span> <span class="n" style="color: #333;">preds</span></span>
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<pre style="margin: 0;">+<span id="LC555" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- implicit params don't really determine a type variable, and</span></span>
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<pre style="margin: 0;">+<span id="LC556" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- skipping this causes implicit params to monomorphise too many</span></span>
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<pre style="margin: 0;">+<span id="LC557" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- variables; see Note [Inheriting implicit parameters] in</span></span>
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<pre style="margin: 0;">+<span id="LC558" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- GHC.Tc.Utils.TcType. Skipping causes typecheck/should_compile/tc219</span></span>
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<pre style="margin: 0;">+<span id="LC559" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to fail.</span></span>
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<pre style="margin: 0;">+<span id="LC560" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC561" class="line" lang="haskell"> <span class="n" style="color: #333;">extend</span> <span class="n" style="color: #333;">fixed_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">foldl'</span> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">fixed_tvs</span> <span class="n" style="color: #333;">tv_fds</span></span>
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<pre style="margin: 0;"> <span id="LC562" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;"> <span id="LC563" class="line" lang="haskell"> <span class="n" style="color: #333;">add</span> <span class="n" style="color: #333;">fixed_tvs</span> <span class="p">(</span><span class="n" style="color: #333;">ls</span><span class="p">,</span><span class="n" style="color: #333;">rs</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">@@ -561,7 +568,7 @@ oclose preds fixed_tvs</td>
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<pre style="margin: 0;"> <span id="LC568" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_fds</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[(</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span><span class="p">,</span><span class="kt" style="color: #458; font-weight: 600;">TyCoVarSet</span><span class="p">)]</span></span>
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<pre style="margin: 0;"> <span id="LC569" class="line" lang="haskell"> <span class="n" style="color: #333;">tv_fds</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">ls</span><span class="p">,</span> <span class="n" style="color: #333;">fvVarSet</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">injectiveVarsOfTypes</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">rs</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC570" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Care with type functions]</span></span>
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<pre style="margin: 0;">-<span id="LC564" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">pred</span> <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="LC571" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;"><span class="idiff left right">non_ip_</span>preds</span></span>
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572
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">pred'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">pred</span> <span class="o" style="font-weight: 600;">:</span> <span class="n" style="color: #333;">transSuperClasses</span> <span class="n" style="color: #333;">pred</span></span>
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573
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Look for fundeps in superclasses too</span></span>
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574
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="haskell"> <span class="p">,</span> <span class="p">(</span><span class="n" style="color: #333;">ls</span><span class="p">,</span> <span class="n" style="color: #333;">rs</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">determined</span> <span class="n" style="color: #333;">pred'</span> <span class="p">]</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#54436e21ea530a66a8a71bcc01c836f4740b8f02"><strong>compiler/GHC/Tc/Solver.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">@@ -1063,9 +1063,8 @@ decideMonoTyVars infer_mode name_taus psigs candidates</td>
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<pre style="margin: 0;"> <span id="LC1063" class="line" lang="haskell"></span>
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1064
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<pre style="margin: 0;"> <span id="LC1064" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">tc_lvl</span> <span class="o" style="font-weight: 600;"><-</span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">getTcLevel</span></span>
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1065
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1065
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<pre style="margin: 0;"> <span id="LC1065" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">psig_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkTyVarTys</span> <span class="n" style="color: #333;">psig_qtvs</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">psig_theta</span></span>
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<pre style="margin: 0;">-<span id="LC1066" class="line" lang="haskell"> <span class="n" style="color: #333;">all_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">candidates</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">psig_tys</span> <span class="o" style="font-weight: 600;">++</span> <span class="n" style="color: #333;">taus</span></span>
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<pre style="margin: 0;"> <span id="LC1066" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC1068" class="line" lang="haskell"> <span class="n" style="color: #333;">co_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coVarsOfTypes</span> <span class="n" style="color: #333;"><span class="idiff left right">all_tys</span></span></span>
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<pre style="margin: 0;">+<span id="LC1067" class="line" lang="haskell"> <span class="n" style="color: #333;">co_vars</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">coVarsOfTypes</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">psig_tys</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">taus</span></span><span class="p"><span class="idiff right">)</span></span></span>
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1069
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<pre style="margin: 0;"> <span id="LC1068" class="line" lang="haskell"> <span class="n" style="color: #333;">co_var_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">closeOverKinds</span> <span class="n" style="color: #333;">co_vars</span></span>
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1070
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<pre style="margin: 0;"> <span id="LC1069" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- The co_var_tvs are tvs mentioned in the types of covars or</span></span>
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<pre style="margin: 0;"> <span id="LC1070" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- coercion holes. We can't quantify over these covars, so we</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">@@ -1074,7 +1073,7 @@ decideMonoTyVars infer_mode name_taus psigs candidates</td>
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1074
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<pre style="margin: 0;"> <span id="LC1073" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantify over k either! Hence closeOverKinds</span></span>
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<pre style="margin: 0;"> <span id="LC1074" class="line" lang="haskell"></span>
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1076
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<pre style="margin: 0;"> <span id="LC1075" class="line" lang="haskell"> <span class="n" style="color: #333;">mono_tvs0</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">not</span> <span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">isQuantifiableTv</span> <span class="n" style="color: #333;">tc_lvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1077" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;"><span class="idiff left right">all_ty</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC1076" class="line" lang="haskell"> <span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;"><span class="idiff left right">candidate</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC1077" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We need to grab all the non-quantifiable tyvars in the</span></span>
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1079
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<pre style="margin: 0;"> <span id="LC1078" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- types so that we can grow this set to find other</span></span>
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<pre style="margin: 0;"> <span id="LC1079" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- non-quantifiable tyvars. This can happen with something</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">@@ -1093,21 +1092,14 @@ decideMonoTyVars infer_mode name_taus psigs candidates</td>
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<pre style="margin: 0;"> <span id="LC1092" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (that's mono_tvs0) and the set of covars, closed over kinds.</span></span>
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<pre style="margin: 0;"> <span id="LC1093" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Given this set of variables we know we will not quantify,</span></span>
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<pre style="margin: 0;"> <span id="LC1094" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we want to find any other variables that are determined by this</span></span>
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<pre style="margin: 0;">-<span id="LC1096" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- set, by functional dependencies or equalities. But we</span></span>
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1097
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<pre style="margin: 0;">-<span id="LC1097" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- want to look at only those constraints which we are unlikely</span></span>
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<pre style="margin: 0;">-<span id="LC1098" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- to quantify over, in the end. (If we quantify over the constraint</span></span>
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<pre style="margin: 0;">-<span id="LC1099" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- itself, then there is no need to avoid quantifying over its</span></span>
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<pre style="margin: 0;">-<span id="LC1100" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- variables.) This final determination is done by</span></span>
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<pre style="margin: 0;">-<span id="LC1101" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- pickQuantifiablePreds, but it needs to know the set of</span></span>
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<pre style="margin: 0;">-<span id="LC1102" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantified variables first. So we make an approximation here:</span></span>
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1103
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<pre style="margin: 0;">-<span id="LC1103" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we guess that we will not quantify over equalities, but will</span></span>
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1104
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<pre style="margin: 0;">-<span id="LC1104" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- quantify over everything else.</span></span>
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1105
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<pre style="margin: 0;">-<span id="LC1105" class="line" lang="haskell"></span>
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1106
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<pre style="margin: 0;">-<span id="LC1106" class="line" lang="haskell"> <span class="n" style="color: #333;">eq_constraints</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filter</span> <span class="n" style="color: #333;">isEqPrimPred</span> <span class="n" style="color: #333;">candidates</span></span>
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1107
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<pre style="margin: 0;">-<span id="LC1107" class="line" lang="haskell"> <span class="n" style="color: #333;">mono_tvs2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">oclose</span> <span class="n" style="color: #333;">eq_constraints</span> <span class="n" style="color: #333;">mono_tvs1</span></span>
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<pre style="margin: 0;">+<span id="LC1095" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- set, by functional dependencies or equalities. We thus use</span></span>
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<pre style="margin: 0;">+<span id="LC1096" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- oclose to find all further variables determined by this root</span></span>
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1097
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<pre style="margin: 0;">+<span id="LC1097" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- set.</span></span>
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<pre style="margin: 0;">+<span id="LC1098" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC1099" class="line" lang="haskell"> <span class="n" style="color: #333;">mono_tvs2</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">oclose</span> <span class="n" style="color: #333;">candidates</span> <span class="n" style="color: #333;">mono_tvs1</span></span>
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1100
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<pre style="margin: 0;"> <span id="LC1100" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1101" class="line" lang="haskell"> <span class="n" style="color: #333;">constrained_tvs</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">filterVarSet</span> <span class="p">(</span><span class="n" style="color: #333;">isQuantifiableTv</span> <span class="n" style="color: #333;">tc_lvl</span><span class="p">)</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC1110" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">oclose</span> <span class="n" style="color: #333;"><span class="idiff left right">eq_constraint</span>s</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">no_quant</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC1102" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">oclose</span> <span class="n" style="color: #333;"><span class="idiff left right">candidate</span>s</span> <span class="p">(</span><span class="n" style="color: #333;">tyCoVarsOfTypes</span> <span class="n" style="color: #333;">no_quant</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1103" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">minusVarSet</span><span class="p">`</span> <span class="n" style="color: #333;">mono_tvs2</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC1104" class="line" lang="haskell"> <span class="p">`</span><span class="n" style="color: #333;">delVarSetList</span><span class="p">`</span> <span class="n" style="color: #333;">psig_qtvs</span></span>
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<pre style="margin: 0;"> <span id="LC1105" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- constrained_tvs: the tyvars that we are not going to</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">@@ -1646,7 +1646,8 @@ maybeKickOut ics ct</td>
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<pre style="margin: 0;"> <span id="LC1646" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="n" style="color: #333;">ics'</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC1647" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC1648" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See [Kick out existing binding for implicit parameter]</span></span>
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<pre style="margin: 0;">-<span id="LC1649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">CDictCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_class</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cls</span><span class="p">,</span> <span class="n" style="color: #333;">cc_tyargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">ip_name_strty</span><span class="p">,</span> <span class="n" style="color: #333;">_ip_ty</span><span class="p">]</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC1649" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">isGivenCt</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;">+<span id="LC1650" class="line" lang="haskell"> <span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">CDictCan</span> <span class="p">{</span> <span class="n" style="color: #333;">cc_class</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">cls</span><span class="p">,</span> <span class="n" style="color: #333;">cc_tyargs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">[</span><span class="n" style="color: #333;">ip_name_strty</span><span class="p">,</span> <span class="n" style="color: #333;">_ip_ty</span><span class="p">]</span> <span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">ct</span></span>
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<pre style="margin: 0;"> <span id="LC1651" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">isIPClass</span> <span class="n" style="color: #333;">cls</span></span>
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<pre style="margin: 0;"> <span id="LC1652" 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;">ip_name</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">isStrLitTy</span> <span class="n" style="color: #333;">ip_name_strty</span></span>
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<pre style="margin: 0;"> <span id="LC1653" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Would this be more efficient if we used findDictsByClass and then delDict?</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#a4496b3af737985647e6efff2bc6d49eafe376ed"><strong>testsuite/tests/typecheck/should_compile/T18398.stderr</strong>
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<pre style="margin: 0;">-<span id="LC1" class="line" lang="plaintext">TYPE SIGNATURES</span>
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<pre style="margin: 0;">-<span id="LC2" class="line" lang="plaintext"> f :: forall {p}. C Ex p => Ex -> (p -> (), p -> ())</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> meth :: forall a b. C a b => a -> b -> ()</span>
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext">TYPE CONSTRUCTORS</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> class C{2} :: * -> * -> Constraint</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> data type Ex{0} :: *</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext">COERCION AXIOMS</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> axiom FloatFDs2.N:C :: C a b = a -> b -> ()</span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext">DATA CONSTRUCTORS</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> MkEx :: forall a. a -> Ex</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext">Dependent modules: []</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext">Dependent packages: [base-4.14.0.0, ghc-prim-0.6.1,</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> integer-gmp-1.0.3.0]</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#5693caa348a03a8f7ef0d53f8cbb0d949a640db3"><strong>testsuite/tests/typecheck/should_compile/T7220a.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">T7220a.hs:17:6: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Could not deduce (C a b)</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> from the context: (C a0 b, TF b ~ Y)</span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> bound by a type expected by the context:</span>
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6
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> forall b. (C a0 b, TF b ~ Y) => b</span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘a0’ with ‘a’</span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> arising from a functional dependency between constraints:</span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> ‘C a b’</span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> arising from a type expected by the context:</span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> forall b. (C a b, TF b ~ Y) => b at T7220a.hs:17:6-44</span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> ‘C a0 b’</span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> arising from a type expected by the context:</span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> forall b. (C a0 b, TF b ~ Y) => b at T7220a.hs:17:6-44</span>
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11
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> ‘a0’ is untouchable</span>
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12
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> inside the constraints: (C a0 b, TF b ~ Y)</span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> bound by a type expected by the context:</span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> forall b. (C a0 b, TF b ~ Y) => b</span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> at T7220a.hs:17:6-44</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> f :: forall a. (forall b. (C a b, TF b ~ Y) => b) -> X</span>
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7
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19
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"> at T7220a.hs:17:6-44</span>
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8
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> Possible fix:</span>
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9
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> add (C a b) to the context of</span>
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10
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> a type expected by the context:</span>
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11
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> forall b. (C a0 b, TF b ~ Y) => b</span>
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12
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> • In the ambiguity check for ‘f’</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"> To defer the ambiguity check to use sites, enable AllowAmbiguousTypes</span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext"> In the type signature: f :: (forall b. (C a b, TF b ~ Y) => b) -> X</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#34fe7bf0e6fbf60effb28393399ba68666593909"><strong>testsuite/tests/typecheck/should_compile/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">@@ -704,6 +704,4 @@ test('T18036', normal, compile, [''])</td>
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<pre style="margin: 0;"> <span id="LC704" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18036a</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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705
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<pre style="margin: 0;"> <span id="LC705" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FunDepOrigin1</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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706
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<pre style="margin: 0;"> <span id="LC706" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FloatFDs</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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707
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<pre style="margin: 0;">-<span id="LC707" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18398</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span>
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<pre style="margin: 0;"> <span id="LC707" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">ImplicitParamFDs</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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709
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<pre style="margin: 0;">-<span id="LC709" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18406</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#666f7d6000ff54754c94c22deb5616f72df2a658"><strong>testsuite/tests/typecheck/should_fail/FD1.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">@@ -14,4 +14,3 @@ instance E a a</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="haskell"><span class="n" style="color: #333;">plus</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">E</span> <span class="n" style="color: #333;">a</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="kt" style="color: #458; font-weight: 600;">Int</span><span class="p">))</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="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">plus</span> <span class="n" style="color: #333;">x</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="n" style="color: #333;">y</span></span></pre>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="haskell"></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#3ef98634a1bdeb088e72b4c97ff5d75a30ba8198"><strong>testsuite/tests/typecheck/should_fail/FD1.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">FD1.hs:15:9: error:</span>
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3
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘a’ with ‘Int -> Int’</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> arising from a functional dependency between:</span>
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5
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> constraint ‘E a (Int -> Int)’</span>
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6
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> arising from the type signature for:</span>
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7
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> plus :: forall a. E a (Int -> Int) => Int -> a</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> instance ‘E a1 a1’ at FD1.hs:13:10-14</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">FD1.hs:16:1: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘a’ with actual type ‘Int -> Int’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> ‘a’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> plus :: forall a. E a (Int -> Int) => Int -> a</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> at FD1.hs:15:<span class="idiff left right">9</span>-38</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> • <span class="idiff left right">In the ambiguity check for ‘plus’</span></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> <span class="idiff left right">To defer the ambiguity check to use sites, enable AllowAmbiguousTypes</span></span>
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<pre style="margin: 0;">-<span id="LC15" class="line" lang="plaintext"> <span class="idiff left right"> In the type signature: plus :: (E a (Int -> Int)) => Int -> a</span></span></pre>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> at FD1.hs:15:<span class="idiff left right">1</span>-38</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> • <span class="idiff left right">The equation(s) for ‘plus’ have two value arguments,</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> <span class="idiff left right"> but its type ‘Int -> a’ has only one</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> <span class="idiff left right">• Relevant bindings include plus :: Int -> a (bound at FD1.hs:16:1)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#aa0069afd943eaf94dac358f5c78d93ab7c32a2e"><strong>testsuite/tests/typecheck/should_fail/FD2.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">FD2.hs:24:12: error:</span>
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<pre style="margin: 0;">-<span id="LC3" class="line" lang="plaintext"> • Couldn't match type ‘e1’ with ‘e’</span>
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4
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<pre style="margin: 0;">-<span id="LC4" class="line" lang="plaintext"> arising from a functional dependency between constraints:</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> ‘Elem a e1’</span>
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<pre style="margin: 0;">-<span id="LC6" class="line" lang="plaintext"> arising from the type signature for:</span>
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<pre style="margin: 0;">-<span id="LC7" class="line" lang="plaintext"> mf :: forall e.</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> Elem a e =></span>
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<pre style="margin: 0;">-<span id="LC9" class="line" lang="plaintext"> e -> Maybe e -> Maybe e at FD2.hs:24:12-54</span>
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<pre style="margin: 0;">-<span id="LC10" class="line" lang="plaintext"> ‘Elem a e’</span>
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<pre style="margin: 0;">-<span id="LC11" class="line" lang="plaintext"> arising from the type signature for:</span>
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<pre style="margin: 0;">-<span id="LC12" class="line" lang="plaintext"> foldr1 :: forall e.</span>
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<pre style="margin: 0;">-<span id="LC13" class="line" lang="plaintext"> Elem a e =></span>
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<pre style="margin: 0;">-<span id="LC14" class="line" lang="plaintext"> (e -> e -> e) -> a -> e at FD2.hs:21:13-47</span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">FD2.hs:26:36: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Couldn't match expected type ‘e’ with actual type ‘e1’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> ‘e1’ is a rigid type variable bound by</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> mf :: forall e1. Elem a e1 => e1 -> Maybe e1 -> Maybe e1</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">@@ -20,13 +9,12 @@ FD2.hs:24:12: error:</td>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> the type signature for:</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> foldr1 :: forall e. Elem a e => (e -> e -> e) -> a -> e</span>
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<pre style="margin: 0;"> <span id="LC11" class="line" lang="plaintext"> at FD2.hs:21:13-47</span>
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<pre style="margin: 0;">-<span id="LC23" class="line" lang="plaintext"> • In an equation for ‘foldr1’:</span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext"> foldr1 f xs</span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext"> = fromMaybe (error "foldr1: empty structure") (foldr mf Nothing xs)</span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="plaintext"> where</span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="plaintext"> mf :: Elem a e => (e -> Maybe e -> Maybe e)</span>
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<pre style="margin: 0;">-<span id="LC28" class="line" lang="plaintext"> mf x Nothing = Just x</span>
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<pre style="margin: 0;">-<span id="LC29" class="line" lang="plaintext"> mf x (Just y) = Just (f x y)</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> • In the first argument of ‘f’, namely ‘x’</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> In the first argument of ‘Just’, namely ‘(f x y)’</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> In the expression: Just (f x y)</span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> • Relevant bindings include</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> y :: e1 (bound at FD2.hs:26:23)</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> x :: e1 (bound at FD2.hs:26:15)</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> mf :: e1 -> Maybe e1 -> Maybe e1 (bound at FD2.hs:25:12)</span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext"> f :: e -> e -> e (bound at FD2.hs:22:10)</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext"> foldr1 :: (e -> e -> e) -> a -> e (bound at FD2.hs:22:3)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#060715794b303bc374b298774c4afb7656d6ae26"><strong>testsuite/tests/typecheck/should_fail/T10194.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T10194.hs:7:8: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘b0’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> with a type involving polytypes: X</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the expression: (.)</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In an equation for ‘comp’: comp = (.)</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#55ac31401970ee88a9f47f5d0a7aa72dac43706a"><strong>testsuite/tests/typecheck/should_fail/T11514.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T11514.hs:6:7: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘a0’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> with a type involving polytypes: (Show a => a -> a) -> ()</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the expression: undefined</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In an equation for ‘foo’: foo = undefined</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> • Relevant bindings include</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#d7828a6e3c388180539d24ecfca77525211f48ec"><strong>testsuite/tests/typecheck/should_fail/T12563.stderr</strong></a>
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<pre style="margin: 0;"> <span id="LC2" class="line" lang="plaintext">T12563.hs:7:15: error:</span>
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<pre style="margin: 0;"> <span id="LC3" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘p0’</span>
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<pre style="margin: 0;"> <span id="LC4" class="line" lang="plaintext"> with a type involving polytypes: (forall a. f0 a) -> f0 r0</span>
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<pre style="margin: 0;">-<span id="LC5" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • In the first argument of ‘foo’, namely ‘g’</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> In the expression: foo g</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> In the expression: \ g -> foo g</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">@@ -5,7 +5,6 @@ T12589.hs:13:5: error:</td>
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<pre style="margin: 0;"> <span id="LC5" class="line" lang="plaintext"> • Cannot instantiate unification variable ‘t1’</span>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="plaintext"> with a type involving polytypes:</span>
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<pre style="margin: 0;"> <span id="LC7" class="line" lang="plaintext"> (forall a. Bounded a => f0 a) -> h0 f0 xs0</span>
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<pre style="margin: 0;">-<span id="LC8" class="line" lang="plaintext"> GHC doesn't yet support impredicative polymorphism</span>
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<pre style="margin: 0;"> <span id="LC8" class="line" lang="plaintext"> • In the second argument of ‘(&)’, namely ‘hcpure (Proxy @Bounded)’</span>
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<pre style="margin: 0;"> <span id="LC9" class="line" lang="plaintext"> In the expression: minBound & hcpure (Proxy @Bounded)</span>
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<pre style="margin: 0;"> <span id="LC10" class="line" lang="plaintext"> In an equation for ‘a’: a = minBound & hcpure (Proxy @Bounded)</span></pre>
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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">T18398.hs:13:70: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • No instance for (C Ex p0) arising from a use of ‘meth’</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the expression: meth x z</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In a case alternative: MkEx _ -> meth x z</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> In the expression: case x of { MkEx _ -> meth x z }</span></pre>
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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">@@ -6,3 +6,10 @@ class C a b | a -> b where</td>
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<pre style="margin: 0;"> <span id="LC6" class="line" lang="haskell"> <span class="n" style="color: #333;">op</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;">b</span> <span class="o" style="font-weight: 600;">-></span> <span class="nb" style="color: #0086b3;">()</span></span>
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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="n" style="color: #333;">f</span> <span class="n" style="color: #333;">x</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">op</span> <span class="kt" style="color: #458; font-weight: 600;">True</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">{- We could accept this, quantifying over a C Bool b constraint. But this is a</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">bit silly, actually, because the b is fixed by the fundep. We don't know what</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">it's fix to, but it's definitely fixed. So, in the end, we choose not to</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Henry Ford polymorphism ("it works for any b as long as b is ???") and not</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">to quantify. Users can quantify manually if they want.</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#5b844e45cf48977a08c676b12bf14eab1ed52244"><strong>testsuite/tests/typecheck/should_fail/T18406.stderr</strong></a>
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1
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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">T18406.hs:8:7: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • No instance for (C Bool b0) arising from a use of ‘op’</span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> • In the expression: op True x</span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> In an equation for ‘f’: f x = op True x</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/d57c9cdb2d4d11ecae98c75bb5c5d03abe61374d#b9e86d897a62509b0114d81d5e736630d6f68f43"><strong>testsuite/tests/typecheck/should_fail/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">@@ -572,3 +572,5 @@ test('FunDepOrigin1b', normal, compile_fail, [''])</td>
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572
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572
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<pre style="margin: 0;"> <span id="LC572" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD1</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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573
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573
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<pre style="margin: 0;"> <span id="LC573" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD2</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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574
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574
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<pre style="margin: 0;"> <span id="LC574" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">FD3</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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575
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<pre style="margin: 0;">+<span id="LC575" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18398</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span>
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576
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<pre style="margin: 0;">+<span id="LC576" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T18406</span><span class="p">',</span> <span class="nv" style="color: #008080;">normal</span><span class="p">,</span> <span class="nv" style="color: #008080;">compile_fail</span><span class="p">,</span> <span class="p">[''])</span></span></pre>
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