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<h3>
Marge Bot pushed to branch master
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
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<h4>
Commits:
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<ul>
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<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/45f88494293bea20cc3aca025ee6fe84087987ce">45f88494</a></strong>
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<span>by Ryan Scott</span>
<i>at 2019-06-01T03:56:27Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Reject nested foralls in foreign imports (#16702)
This replaces a panic observed in #16702 with a simple error message
stating that nested `forall`s simply aren't allowed in the type
signature of a `foreign import` (at least, not at present).
Fixes #16702.
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<h4>5 changed files:</h4>
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<li class="file-stats">
<a href="#e5d0de6b086bbc65938b566dbebcc274be64dab8">
compiler/typecheck/TcForeign.hs
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<li class="file-stats">
<a href="#2b8f04584fafff0b8f78c8867b06665527f31762">
docs/users_guide/ffi-chap.rst
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<li class="file-stats">
<a href="#8ae3403efd5151d893f104397ad6327ed8e69e13">
<span class="new-file">
+
testsuite/tests/ffi/should_fail/T16702.hs
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<a href="#8b6a43d3ade5c92512bc0e2778dcf489b246d024">
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+
testsuite/tests/ffi/should_fail/T16702.stderr
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<li class="file-stats">
<a href="#959604952ad853722a516e17c23d0cf7a5aa7815">
testsuite/tests/ffi/should_fail/all.T
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<h4>Changes:</h4>
<li id="e5d0de6b086bbc65938b566dbebcc274be64dab8">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/45f88494293bea20cc3aca025ee6fe84087987ce#e5d0de6b086bbc65938b566dbebcc274be64dab8"><strong>compiler/typecheck/TcForeign.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">@@ -64,7 +64,6 @@ import Hooks</td>
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<pre style="margin: 0;"> <span id="LC64" 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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<pre style="margin: 0;"> <span id="LC65" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC66" 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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<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;">Data.Maybe</span></span>
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Defines a binding</span></span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="haskell"><span class="n" style="color: #333;">isForeignImport</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">LForeignDecl</span> <span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Bool</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="251" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="250" 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">@@ -251,8 +250,7 @@ tcFImport (L dloc fo@(ForeignImport { fd_name = L nloc nm, fd_sig_ty = hs_ty</td>
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<pre style="margin: 0;"> <span id="LC250" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span></span>
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<pre style="margin: 0;"> <span id="LC251" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Drop the foralls before inspecting the</span></span>
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<pre style="margin: 0;"> <span id="LC252" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- structure of the foreign type.</span></span>
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<pre style="margin: 0;">-<span id="LC254" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitPiTys</span> <span class="n" style="color: #333;">norm_sig_ty</span></span>
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<pre style="margin: 0;">-<span id="LC255" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">binderRelevantType_maybe</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC253" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">dropForAlls</span> <span class="n" style="color: #333;">norm_sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC254" class="line" lang="haskell"> <span class="n" style="color: #333;">id</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkLocalId</span> <span class="n" style="color: #333;">nm</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Use a LocalId to obey the invariant that locally-defined</span></span>
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<pre style="margin: 0;"> <span id="LC256" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- things are LocalIds. However, it does not need zonking,</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="424" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="422" 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">@@ -424,10 +422,9 @@ tcCheckFEType sig_ty (CExport (L l (CExportStatic esrc str cconv)) src) = do</td>
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<pre style="margin: 0;"> <span id="LC422" class="line" lang="haskell"> <span class="n" style="color: #333;">checkForeignRes</span> <span class="n" style="color: #333;">nonIOok</span> <span class="n" style="color: #333;">noCheckSafe</span> <span class="n" style="color: #333;">isFFIExportResultTy</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC423" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CExport</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">l</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CExportStatic</span> <span class="n" style="color: #333;">esrc</span> <span class="n" style="color: #333;">str</span> <span class="n" style="color: #333;">cconv'</span><span class="p">))</span> <span class="n" style="color: #333;">src</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC424" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC427" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Drop the foralls before inspecting<span class="idiff left right"> n</span></span></span>
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<pre style="margin: 0;">+<span id="LC425" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Drop the foralls before inspecting</span></span>
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<pre style="margin: 0;"> <span id="LC426" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- the structure of the foreign type.</span></span>
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<pre style="margin: 0;">-<span id="LC429" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">bndrs</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitPiTys</span> <span class="n" style="color: #333;">sig_ty</span></span>
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<pre style="margin: 0;">-<span id="LC430" class="line" lang="haskell"> <span class="n" style="color: #333;">arg_tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapMaybe</span> <span class="n" style="color: #333;">binderRelevantType_maybe</span> <span class="n" style="color: #333;">bndrs</span></span>
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<pre style="margin: 0;">+<span id="LC427" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">arg_tys</span><span class="p">,</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">tcSplitFunTys</span> <span class="p">(</span><span class="n" style="color: #333;">dropForAlls</span> <span class="n" style="color: #333;">sig_ty</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC428" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC429" 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="LC430" class="line" lang="haskell"><span class="cm" style="color: #998; font-style: italic;">************************************************************************</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -458,6 +455,11 @@ checkForeignRes non_io_result_ok check_safe pred_res_ty ty</td>
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<pre style="margin: 0;"> <span id="LC455" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="c1" style="color: #998; font-style: italic;">-- Got an IO result type, that's always fine!</span></span>
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<pre style="margin: 0;"> <span id="LC456" class="line" lang="haskell"> <span class="n" style="color: #333;">check</span> <span class="p">(</span><span class="n" style="color: #333;">pred_res_ty</span> <span class="n" style="color: #333;">res_ty</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">illegalForeignTyErr</span> <span class="n" style="color: #333;">result</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC457" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC458" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- We disallow nested foralls in foreign types</span></span>
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<pre style="margin: 0;">+<span id="LC459" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (at least, for the time being). See #16702.</span></span>
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<pre style="margin: 0;">+<span id="LC460" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">tcIsForAllTy</span> <span class="n" style="color: #333;">ty</span></span>
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<pre style="margin: 0;">+<span id="LC461" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrTc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">illegalForeignTyErr</span> <span class="n" style="color: #333;">result</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Unexpected nested forall"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC462" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC463" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Case for non-IO result type with FFI Import</span></span>
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<pre style="margin: 0;"> <span id="LC464" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="n" style="color: #333;">non_io_result_ok</span></span>
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<pre style="margin: 0;"> <span id="LC465" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">addErrTc</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">illegalForeignTyErr</span> <span class="n" style="color: #333;">result</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"IO result type expected"</span><span class="p">)</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/45f88494293bea20cc3aca025ee6fe84087987ce#2b8f04584fafff0b8f78c8867b06665527f31762"><strong>docs/users_guide/ffi-chap.rst</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -14,9 +14,10 @@ Foreign function interface (FFI)</td>
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="plaintext"> Allow use of the Haskell foreign function interface.</span>
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC17" class="line" lang="plaintext">GHC (mostly) conforms to the Haskell Foreign Function Interface, whose</span>
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<pre style="margin: 0;">-<span id="LC18" class="line" lang="plaintext">definition is part of the Haskell Report on</span>
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<pre style="margin: 0;">-<span id="LC19" class="line" lang="plaintext">`http://www.haskell.org/ <http://www.haskell.org/>`__.</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">GHC (mostly) conforms to the Haskell Foreign Function Interface as specified</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext">in the Haskell Report. Refer to the `relevant chapter</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"><https://www.haskell.org/onlinereport/haskell2010/haskellch8.html>_`</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext">of the Haskell Report for more details.</span>
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<pre style="margin: 0;"> <span id="LC21" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">FFI support is enabled by default, but can be enabled or disabled</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext">explicitly with the :extension:`ForeignFunctionInterface` flag.</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">@@ -102,6 +103,25 @@ OK: ::</td>
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<pre style="margin: 0;"> <span id="LC103" class="line" lang="plaintext"> foreign import foo :: Int -> MyIO Int</span>
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<pre style="margin: 0;"> <span id="LC104" class="line" lang="plaintext"> foreign import "dynamic" baz :: (Int -> MyIO Int) -> CInt -> MyIO Int</span>
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<pre style="margin: 0;"> <span id="LC105" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="plaintext">.. _ffi-foralls:</span>
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC108" class="line" lang="plaintext">Explicit ``forall``s in foreign types</span>
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<pre style="margin: 0;">+<span id="LC109" class="line" lang="plaintext">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</span>
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<pre style="margin: 0;">+<span id="LC110" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext">The type variables in the type of a foreign declaration may be quantified with</span>
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<pre style="margin: 0;">+<span id="LC112" class="line" lang="plaintext">an explicit ``forall`` by using the :extension:`ExplicitForAll` language</span>
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<pre style="margin: 0;">+<span id="LC113" class="line" lang="plaintext">extension, as in the following example: ::</span>
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114
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<pre style="margin: 0;">+<span id="LC114" class="line" lang="plaintext"></span>
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115
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<pre style="margin: 0;">+<span id="LC115" class="line" lang="plaintext"> {-# LANGUAGE ExplicitForAll #-}</span>
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116
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<pre style="margin: 0;">+<span id="LC116" class="line" lang="plaintext"> foreign import ccall "mmap" c_mmap :: forall a. CSize -> IO (Ptr a)</span>
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117
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<pre style="margin: 0;">+<span id="LC117" class="line" lang="plaintext"></span>
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118
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<pre style="margin: 0;">+<span id="LC118" class="line" lang="plaintext">Note that an explicit ``forall`` must appear at the front of the type signature</span>
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119
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<pre style="margin: 0;">+<span id="LC119" class="line" lang="plaintext">and is not permitted to appear nested within the type, as in the following</span>
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<pre style="margin: 0;">+<span id="LC120" class="line" lang="plaintext">(erroneous) examples: ::</span>
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121
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="plaintext"> foreign import ccall "mmap" c_mmap' :: CSize -> forall a. IO (Ptr a)</span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext"> foreign import ccall quux :: (forall a. Ptr a) -> IO ()</span>
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<pre style="margin: 0;">+<span id="LC124" class="line" lang="plaintext"></span>
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105
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="plaintext">.. _ffi-prim:</span>
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106
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC127" class="line" lang="plaintext">Primitive imports</span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/45f88494293bea20cc3aca025ee6fe84087987ce#8ae3403efd5151d893f104397ad6327ed8e69e13"><strong>testsuite/tests/ffi/should_fail/T16702.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 ForeignFunctionInterface #-}</span></span>
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2
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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 TypeFamilies #-}</span></span>
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3
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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 UnliftedFFITypes #-}</span></span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# LANGUAGE RankNTypes #-}</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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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">T16702</span> <span class="kr" style="font-weight: 600;">where</span></span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"></span>
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8
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.C.Types</span></span>
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9
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.Ptr</span></span>
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10
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Data.Kind</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="s" style="color: #d14;">"math.h pow"</span></span>
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13
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"> <span class="n" style="color: #333;">c_pow</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CDouble</span></span>
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14
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">CDouble</span></span>
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15
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">forall</span> <span class="p">(</span><span class="n" style="color: #333;">b</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">)</span><span class="o" style="font-weight: 600;">.</span> <span class="kt" style="color: #458; font-weight: 600;">CDouble</span></span>
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16
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"></span>
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17
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="s" style="color: #d14;">"malloc"</span></span>
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18
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"> <span class="n" style="color: #333;">malloc1</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CSize</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="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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19
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="s" style="color: #d14;">"malloc"</span></span>
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21
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"> <span class="n" style="color: #333;">malloc2</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">CSize</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">foreign</span> <span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">ccall</span> <span class="s" style="color: #d14;">"malloc"</span></span>
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24
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">malloc3</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">CSize</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Show</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=></span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Ptr</span> <span class="n" style="color: #333;">a</span><span class="p">)</span></span></pre>
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<li id="8b6a43d3ade5c92512bc0e2778dcf489b246d024">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/45f88494293bea20cc3aca025ee6fe84087987ce#8b6a43d3ade5c92512bc0e2778dcf489b246d024"><strong>testsuite/tests/ffi/should_fail/T16702.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">T16702.hs:12:1: error:</span>
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3
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Unacceptable result type in foreign declaration:</span>
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4
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Unexpected nested forall</span>
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5
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • When checking declaration:</span>
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6
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> foreign import ccall safe "math.h pow" c_pow</span>
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7
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="plaintext"> :: CDouble</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext"> -> forall (a :: Type). CDouble -> forall (b :: Type). CDouble</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext">T16702.hs:17:1: error:</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> • Unacceptable result type in foreign declaration:</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> Unexpected nested forall</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> • When checking declaration:</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"> foreign import ccall safe "malloc" malloc1</span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext"> :: CSize -> forall a. IO (Ptr a)</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext">T16702.hs:20:1: error:</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> • Unacceptable argument type in foreign declaration:</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> ‘Show a’ cannot be marshalled in a foreign call</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> • When checking declaration:</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext"> foreign import ccall safe "malloc" malloc2</span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="plaintext"> :: Show a => CSize -> IO (Ptr a)</span>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">T16702.hs:23:1: error:</span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"> • Unacceptable argument type in foreign declaration:</span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"> ‘Show a’ cannot be marshalled in a foreign call</span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"> • When checking declaration:</span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="plaintext"> foreign import ccall safe "malloc" malloc3</span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="plaintext"> :: CSize -> Show a => IO (Ptr a)</span></pre>
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<li id="959604952ad853722a516e17c23d0cf7a5aa7815">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/45f88494293bea20cc3aca025ee6fe84087987ce#959604952ad853722a516e17c23d0cf7a5aa7815"><strong>testsuite/tests/ffi/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">@@ -14,6 +14,7 @@ test('T5664', normal, compile_fail, ['-v0'])</td>
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14
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<pre style="margin: 0;"> <span id="LC14" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T7506'</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 class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;"> <span id="LC15" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T7243'</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 class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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16
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<pre style="margin: 0;"> <span id="LC16" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T10461'</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 class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">(</span><span class="s" style="color: #d14;">'T16702'</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 class="s" style="color: #d14;">''</span><span class="p">])</span></span>
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17
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="perl"></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># UnsafeReenter tests implementation of an undefined behavior (calling Haskell</span></span>
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19
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="perl"><span class="c1" style="color: #998; font-style: italic;"># from an unsafe foreign function) and only makes sense in non-threaded way</span></span>
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