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<h3>
Ryan Scott pushed to branch wip/T18005
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e0f90b7084052aa9473a326b14b9247b3fde4cc">2e0f90b7</a></strong>
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<span>by Ryan Scott</span>
<i>at 2020-04-03T10:44:05-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Enable ImpredicativeTypes internally when typechecking selector bindings
This is necessary for certain record selectors with higher-rank
types, such as the examples in #18005. See
`Note [Impredicative record selectors]` in `TcTyDecls`.
Fixes #18005.
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<h4>3 changed files:</h4>
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<li class="file-stats">
<a href="#9bf2a6096cb14bc07c1c4cdd8299cfd75ed78650">
compiler/typecheck/TcTyDecls.hs
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+
testsuite/tests/typecheck/should_compile/T18005.hs
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<a href="#34fe7bf0e6fbf60effb28393399ba68666593909">
testsuite/tests/typecheck/should_compile/all.T
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<h4>Changes:</h4>
<li id="9bf2a6096cb14bc07c1c4cdd8299cfd75ed78650">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e0f90b7084052aa9473a326b14b9247b3fde4cc#9bf2a6096cb14bc07c1c4cdd8299cfd75ed78650"><strong>compiler/typecheck/TcTyDecls.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">@@ -67,6 +67,7 @@ import Bag</td>
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">FastString</span></span>
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68
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">FV</span></span>
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69
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GHC.Types.Module</span></span>
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70
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="k" style="font-weight: 600;">qualified</span> <span class="nn" style="color: #555;">GHC.LanguageExtensions</span> <span class="k" style="font-weight: 600;">as</span> <span class="n" style="color: #333;">LangExt</span></span>
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70
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71
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<pre style="margin: 0;"> <span id="LC71" class="line" lang="haskell"></span>
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72
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<pre style="margin: 0;"> <span id="LC72" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Control.Monad</span></span>
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72
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73
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<pre style="margin: 0;"> <span id="LC73" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="832" 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">@@ -831,6 +832,8 @@ tcRecSelBinds :: [(Id, LHsBind GhcRn)] -> TcM TcGblEnv</td>
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831
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832
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<pre style="margin: 0;"> <span id="LC832" class="line" lang="haskell"><span class="n" style="color: #333;">tcRecSelBinds</span> <span class="n" style="color: #333;">sel_bind_prs</span></span>
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832
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833
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<pre style="margin: 0;"> <span id="LC833" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcExtendGlobalValEnv</span> <span class="p">[</span><span class="n" style="color: #333;">sel_id</span> <span class="o" style="font-weight: 600;">|</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="kr" style="font-weight: 600;">_</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IdSig</span> <span class="kr" style="font-weight: 600;">_</span> <span class="n" style="color: #333;">sel_id</span><span class="p">))</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">sigs</span><span class="p">]</span> <span class="o" style="font-weight: 600;">$</span></span>
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833
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834
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<pre style="margin: 0;"> <span id="LC834" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">do</span> <span class="p">{</span> <span class="p">(</span><span class="n" style="color: #333;">rec_sel_binds</span><span class="p">,</span> <span class="n" style="color: #333;">tcg_env</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">discardWarnings</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">+<span id="LC835" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- See Note [Impredicative record selectors]</span></span>
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836
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<pre style="margin: 0;">+<span id="LC836" class="line" lang="haskell"> <span class="n" style="color: #333;">setXOptM</span> <span class="kt" style="color: #458; font-weight: 600;">LangExt</span><span class="o" style="font-weight: 600;">.</span><span class="kt" style="color: #458; font-weight: 600;">ImpredicativeTypes</span> <span class="o" style="font-weight: 600;">$</span></span>
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834
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<pre style="margin: 0;"> <span id="LC837" class="line" lang="haskell"> <span class="n" style="color: #333;">tcValBinds</span> <span class="kt" style="color: #458; font-weight: 600;">TopLevel</span> <span class="n" style="color: #333;">binds</span> <span class="n" style="color: #333;">sigs</span> <span class="n" style="color: #333;">getGblEnv</span></span>
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835
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838
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<pre style="margin: 0;"> <span id="LC838" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">tcg_env</span> <span class="p">`</span><span class="n" style="color: #333;">addTypecheckedBinds</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;">rec_sel_binds</span><span class="p">)</span> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC839" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="1032" 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">@@ -1029,4 +1032,29 @@ The selector we want for fld looks like this:</td>
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1029
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1032
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<pre style="margin: 0;"> <span id="LC1032" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">The scrutinee of the case has type :R7T (Maybe b), which can be</span></span>
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1030
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<pre style="margin: 0;"> <span id="LC1033" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">gotten by applying the eq_spec to the univ_tvs of the data con.</span></span>
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1031
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1034
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<pre style="margin: 0;"> <span id="LC1034" class="line" lang="haskell"></span>
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1035
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<pre style="margin: 0;">+<span id="LC1035" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note [Impredicative record selectors]</span></span>
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1036
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<pre style="margin: 0;">+<span id="LC1036" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span></span>
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1037
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<pre style="margin: 0;">+<span id="LC1037" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">There are situations where generating code for record selectors requires the</span></span>
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1038
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<pre style="margin: 0;">+<span id="LC1038" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">use of ImpredicativeTypes. Here is one example (adapted from #18005):</span></span>
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1039
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<pre style="margin: 0;">+<span id="LC1039" class="line" lang="haskell"></span>
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1040
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<pre style="margin: 0;">+<span id="LC1040" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> type S = (forall b. b -> b) -> Int</span></span>
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1041
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<pre style="margin: 0;">+<span id="LC1041" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> data T = MkT {unT :: S}</span></span>
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1042
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<pre style="margin: 0;">+<span id="LC1042" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> | Dummy</span></span>
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1043
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<pre style="margin: 0;">+<span id="LC1043" class="line" lang="haskell"></span>
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1044
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<pre style="margin: 0;">+<span id="LC1044" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">We want to generate HsBinds for unT that look something like this:</span></span>
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1045
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<pre style="margin: 0;">+<span id="LC1045" class="line" lang="haskell"></span>
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1046
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<pre style="margin: 0;">+<span id="LC1046" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unT :: S</span></span>
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1047
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<pre style="margin: 0;">+<span id="LC1047" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unT (MkT x) = x</span></span>
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1048
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<pre style="margin: 0;">+<span id="LC1048" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;"> unT _ = recSelError "unT"#</span></span>
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1049
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<pre style="margin: 0;">+<span id="LC1049" class="line" lang="haskell"></span>
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1050
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<pre style="margin: 0;">+<span id="LC1050" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Note that the type of recSelError is `forall r (a :: TYPE r). Addr# -> a`.</span></span>
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1051
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<pre style="margin: 0;">+<span id="LC1051" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Therefore, when used in the right-hand side of `unT`, GHC attempts to</span></span>
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1052
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<pre style="margin: 0;">+<span id="LC1052" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">instantiate `a` with `(forall b. b -> b) -> Int`, which is impredicative.</span></span>
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1053
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<pre style="margin: 0;">+<span id="LC1053" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">To make sure that GHC is OK with this, we enable ImpredicativeTypes interally</span></span>
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1054
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<pre style="margin: 0;">+<span id="LC1054" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">when typechecking these HsBinds so that the user does not have to.</span></span>
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1055
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<pre style="margin: 0;">+<span id="LC1055" class="line" lang="haskell"></span>
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1056
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<pre style="margin: 0;">+<span id="LC1056" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">Although ImpredicativeTypes is somewhat fragile and unpredictable in GHC right</span></span>
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1057
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<pre style="margin: 0;">+<span id="LC1057" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">now, it will become robust when Quick Look impredicativity is implemented. In</span></span>
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1058
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<pre style="margin: 0;">+<span id="LC1058" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">the meantime, using ImpredicativeTypes to instantiate the `a` type variable in</span></span>
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<pre style="margin: 0;">+<span id="LC1059" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">recSelError's type does actually work, so its use here is benign.</span></span>
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<pre style="margin: 0;"> <span id="LC1060" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">-}</span></span></pre>
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<li id="232c624b3aebd964c68b9403ab8e70550e7e4871">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e0f90b7084052aa9473a326b14b9247b3fde4cc#232c624b3aebd964c68b9403ab8e70550e7e4871"><strong>testsuite/tests/typecheck/should_compile/T18005.hs</strong></a>
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<pre style="margin: 0;">+<span id="LC1" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE PatternSynonyms #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE ViewPatterns #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T18005</span> <span class="kr" style="font-weight: 600;">where</span></span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">S1</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">(</span><span class="n" style="color: #333;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Int</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="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T1a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT1a</span> <span class="p">{</span><span class="n" style="color: #333;">unT1a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">S1</span><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Dummy1</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">T1b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT1b</span> <span class="kt" style="color: #458; font-weight: 600;">S1</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="n" style="color: #333;">unT1b'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T1b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">S1</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="n" style="color: #333;">unT1b'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT1b</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">MkT1b'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">S1</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T1b</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">MkT1b'</span> <span class="p">{</span><span class="n" style="color: #333;">unT1b</span><span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">(</span><span class="n" style="color: #333;">unT1b'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unT1b</span><span class="p">)</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">S2</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;">forall</span> <span class="n" style="color: #333;">a</span><span class="o" style="font-weight: 600;">.</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">a</span></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">data</span> <span class="kt" style="color: #458; font-weight: 600;">T2a</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT2a</span> <span class="p">{</span><span class="n" style="color: #333;">unT2a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">S2</span><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">Dummy2</span></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">T2b</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">MkT2b</span> <span class="kt" style="color: #458; font-weight: 600;">S2</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"><span class="n" style="color: #333;">unT2b'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">T2b</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">S2</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"><span class="n" style="color: #333;">unT2b'</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">MkT2b</span> <span class="n" style="color: #333;">x</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">x</span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">MkT2b'</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">S2</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">T2b</span></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="haskell"><span class="n" style="color: #333;">pattern</span> <span class="kt" style="color: #458; font-weight: 600;">MkT2b'</span> <span class="p">{</span><span class="n" style="color: #333;">unT2b</span><span class="p">}</span> <span class="o" style="font-weight: 600;"><-</span> <span class="p">(</span><span class="n" style="color: #333;">unT2b'</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">unT2b</span><span class="p">)</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/2e0f90b7084052aa9473a326b14b9247b3fde4cc#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">@@ -701,3 +701,4 @@ test('T17710', normal, compile, [''])</td>
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701
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<pre style="margin: 0;"> <span id="LC701" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17792</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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702
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702
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<pre style="margin: 0;"> <span id="LC702" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17024</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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703
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703
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<pre style="margin: 0;"> <span id="LC703" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">T17021a</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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704
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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;">T18005</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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