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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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<strong><a href="https://gitlab.haskell.org/ghc/ghc/-/commit/160fba4aa306c0649c72a6dcd7c98d9782a0e74b">160fba4a</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2020-09-26T13:19:00-04:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Disallow linear types in FFI (#18472)
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<h4>4 changed files:</h4>
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<li class="file-stats">
<a href="#08a3d553a8ca7a753d77697815b63cd85e7dfbd6">
compiler/GHC/Tc/Gen/Foreign.hs
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<a href="#7c748bced26d07aa398acaa4bf03ba916acb63d9">
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+
testsuite/tests/linear/should_fail/LinearFFI.hs
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testsuite/tests/linear/should_fail/LinearFFI.stderr
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<a href="#9eaf3d28760bfe4fb6839aeb7cad53d8f9bac1c1">
testsuite/tests/linear/should_fail/all.T
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<h4>Changes:</h4>
<li id="08a3d553a8ca7a753d77697815b63cd85e7dfbd6">
<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/160fba4aa306c0649c72a6dcd7c98d9782a0e74b#08a3d553a8ca7a753d77697815b63cd85e7dfbd6"><strong>compiler/GHC/Tc/Gen/Foreign.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">@@ -243,7 +243,7 @@ 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="LC243" 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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<pre style="margin: 0;"> <span id="LC244" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- (so GHC.Tc.Utils.Zonk.zonkForeignExports ignores it).</span></span>
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<pre style="margin: 0;"> <span id="LC245" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC246" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">imp_decl'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCheckFIType</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">scaledThing</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg_tys</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">imp_decl</span></span>
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<pre style="margin: 0;">+<span id="LC246" class="line" lang="haskell"> <span class="p">;</span> <span class="n" style="color: #333;">imp_decl'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">tcCheckFIType</span> <span class="n" style="color: #333;"><span class="idiff left right">arg_tys</span></span> <span class="n" style="color: #333;">res_ty</span> <span class="n" style="color: #333;">imp_decl</span></span>
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<pre style="margin: 0;"> <span id="LC247" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Can't use sig_ty here because sig_ty :: Type and</span></span>
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<pre style="margin: 0;"> <span id="LC248" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- we need HsType Id hence the undefined</span></span>
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<pre style="margin: 0;"> <span id="LC249" class="line" lang="haskell"> <span class="p">;</span> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">fi_decl</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignImport</span> <span class="p">{</span> <span class="n" style="color: #333;">fd_name</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">nloc</span> <span class="n" style="color: #333;">id</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="255" 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>
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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">@@ -255,14 +255,14 @@ tcFImport d = pprPanic "tcFImport" (ppr d)</td>
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<pre style="margin: 0;"> <span id="LC255" class="line" lang="haskell"></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;">-- ------------ Checking types for foreign import ----------------------</span></span>
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<pre style="margin: 0;"> <span id="LC257" class="line" lang="haskell"></span>
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<pre style="margin: 0;">-<span id="LC258" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckFIType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ForeignImport</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignImport</span></span>
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<pre style="margin: 0;">+<span id="LC258" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckFIType</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Scaled</span></span><span class="idiff right"> </span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">ForeignImport</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignImport</span></span>
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<pre style="margin: 0;"> <span id="LC259" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC260" class="line" lang="haskell"><span class="n" style="color: #333;">tcCheckFIType</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">res_ty</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CImport</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">cconv</span><span class="p">)</span> <span class="n" style="color: #333;">safety</span> <span class="n" style="color: #333;">mh</span> <span class="n" style="color: #333;">l</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">CLabel</span> <span class="kr" style="font-weight: 600;">_</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="LC261" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- Foreign import label</span></span>
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<pre style="margin: 0;"> <span id="LC262" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">checkCg</span> <span class="n" style="color: #333;">checkCOrAsmOrLlvmOrInterp</span></span>
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<pre style="margin: 0;"> <span id="LC263" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- NB check res_ty not sig_ty!</span></span>
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264
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<pre style="margin: 0;"> <span id="LC264" class="line" lang="haskell"> <span class="c1" style="color: #998; font-style: italic;">-- In case sig_ty is (forall a. ForeignPtr a)</span></span>
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265
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<pre style="margin: 0;">-<span id="LC265" class="line" lang="haskell"> <span class="n" style="color: #333;">check</span> <span class="p">(</span><span class="n" style="color: #333;">isFFILabelTy</span> <span class="p">(</span><span class="n" style="color: #333;">mkVisFunTys<span class="idiff left right">Many</span></span> <span class="n" style="color: #333;">arg_tys</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="kt" style="color: #458; font-weight: 600;">Outputable</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">empty</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC265" class="line" lang="haskell"> <span class="n" style="color: #333;">check</span> <span class="p">(</span><span class="n" style="color: #333;">isFFILabelTy</span> <span class="p">(</span><span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">arg_tys</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="kt" style="color: #458; font-weight: 600;">Outputable</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">empty</span><span class="p">)</span></span>
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266
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266
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<pre style="margin: 0;"> <span id="LC266" class="line" lang="haskell"> <span class="n" style="color: #333;">cconv'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkCConv</span> <span class="n" style="color: #333;">cconv</span></span>
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267
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267
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<pre style="margin: 0;"> <span id="LC267" 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;">CImport</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">L</span> <span class="n" style="color: #333;">lc</span> <span class="n" style="color: #333;">cconv'</span><span class="p">)</span> <span class="n" style="color: #333;">safety</span> <span class="n" style="color: #333;">mh</span> <span class="n" style="color: #333;">l</span> <span class="n" style="color: #333;">src</span><span class="p">)</span></span>
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268
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<pre style="margin: 0;"> <span id="LC268" class="line" lang="haskell"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="274" 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="274" 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">@@ -274,7 +274,9 @@ tcCheckFIType arg_tys res_ty (CImport (L lc cconv) safety mh CWrapper src) = do</td>
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274
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<pre style="margin: 0;"> <span id="LC274" class="line" lang="haskell"> <span class="n" style="color: #333;">checkCg</span> <span class="n" style="color: #333;">checkCOrAsmOrLlvmOrInterp</span></span>
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275
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<pre style="margin: 0;"> <span id="LC275" class="line" lang="haskell"> <span class="n" style="color: #333;">cconv'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkCConv</span> <span class="n" style="color: #333;">cconv</span></span>
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<pre style="margin: 0;"> <span id="LC276" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">arg_tys</span> <span class="kr" style="font-weight: 600;">of</span></span>
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277
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<pre style="margin: 0;">-<span id="LC277" class="line" lang="haskell"> <span class="p">[</span><span class="n" style="color: #333;">arg1_ty</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span> <span class="n" style="color: #333;">checkForeignArgs</span> <span class="n" style="color: #333;">isFFIExternalTy</span> <span class="p">(</span><span class="n" style="color: #333;">map</span> <span class="n" style="color: #333;">scaledThing</span> <span class="n" style="color: #333;">arg1_tys</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC277" class="line" lang="haskell"> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">arg1_mult</span> <span class="n" style="color: #333;">arg1_ty</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC278" class="line" lang="haskell"> <span class="n" style="color: #333;">checkNoLinearFFI</span> <span class="n" style="color: #333;">arg1_mult</span></span>
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<pre style="margin: 0;">+<span id="LC279" class="line" lang="haskell"> <span class="n" style="color: #333;">checkForeignArgs</span> <span class="n" style="color: #333;">isFFIExternalTy</span> <span class="n" style="color: #333;">arg1_tys</span></span>
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278
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<pre style="margin: 0;"> <span id="LC280" 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;">checkSafe</span> <span class="n" style="color: #333;">isFFIExportResultTy</span> <span class="n" style="color: #333;">res1_ty</span></span>
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279
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<pre style="margin: 0;"> <span id="LC281" class="line" lang="haskell"> <span class="n" style="color: #333;">checkForeignRes</span> <span class="n" style="color: #333;">mustBeIO</span> <span class="n" style="color: #333;">checkSafe</span> <span class="p">(</span><span class="n" style="color: #333;">isFFIDynTy</span> <span class="n" style="color: #333;">arg1_ty</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;"> <span id="LC282" 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 old_line" data-linenumber="290" 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="292" 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">@@ -290,9 +292,10 @@ tcCheckFIType arg_tys res_ty idecl@(CImport (L lc cconv) (L ls safety) mh</td>
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<pre style="margin: 0;"> <span id="LC292" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">arg_tys</span> <span class="kr" style="font-weight: 600;">of</span> <span class="c1" style="color: #998; font-style: italic;">-- The first arg must be Ptr or FunPtr</span></span>
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<pre style="margin: 0;"> <span id="LC293" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">[]</span> <span class="o" style="font-weight: 600;">-></span></span>
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292
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294
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<pre style="margin: 0;"> <span id="LC294" class="line" lang="haskell"> <span class="n" style="color: #333;">addErrTc</span> <span class="p">(</span><span class="n" style="color: #333;">illegalForeignTyErr</span> <span class="kt" style="color: #458; font-weight: 600;">Outputable</span><span class="o" style="font-weight: 600;">.</span><span class="n" style="color: #333;">empty</span> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"At least one argument expected"</span><span class="p">))</span></span>
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293
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<pre style="margin: 0;">-<span id="LC293" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">arg1_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">arg_tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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<pre style="margin: 0;">+<span id="LC295" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Scaled</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg1_mult</span></span><span class="idiff right"> </span><span class="n" style="color: #333;">arg1_ty</span><span class="o" style="font-weight: 600;">:</span><span class="n" style="color: #333;">arg_tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="kr" style="font-weight: 600;">do</span></span>
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294
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296
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<pre style="margin: 0;"> <span id="LC296" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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295
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<pre style="margin: 0;">-<span id="LC295" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">curried_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTysMany</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC297" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">curried_res_ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkVisFunTys</span> <span class="n" style="color: #333;">arg_tys</span> <span class="n" style="color: #333;">res_ty</span></span>
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298
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<pre style="margin: 0;">+<span id="LC298" class="line" lang="haskell"> <span class="n" style="color: #333;">checkNoLinearFFI</span> <span class="n" style="color: #333;">arg1_mult</span></span>
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296
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<pre style="margin: 0;"> <span id="LC299" class="line" lang="haskell"> <span class="n" style="color: #333;">check</span> <span class="p">(</span><span class="n" style="color: #333;">isFFIDynTy</span> <span class="n" style="color: #333;">curried_res_ty</span> <span class="n" style="color: #333;">arg1_ty</span><span class="p">)</span></span>
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297
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300
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<pre style="margin: 0;"> <span id="LC300" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">illegalForeignTyErr</span> <span class="n" style="color: #333;">argument</span><span class="p">)</span></span>
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298
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301
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<pre style="margin: 0;"> <span id="LC301" class="line" lang="haskell"> <span class="n" style="color: #333;">checkForeignArgs</span> <span class="p">(</span><span class="n" style="color: #333;">isFFIArgumentTy</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">safety</span><span class="p">)</span> <span class="n" style="color: #333;">arg_tys</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="317" 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="320" 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">@@ -317,7 +320,7 @@ tcCheckFIType arg_tys res_ty idecl@(CImport (L lc cconv) (L ls safety) mh</td>
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317
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320
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<pre style="margin: 0;"> <span id="LC320" class="line" lang="haskell"> <span class="n" style="color: #333;">dflags</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">getDynFlags</span></span>
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318
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321
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<pre style="margin: 0;"> <span id="LC321" class="line" lang="haskell"> <span class="n" style="color: #333;">checkForeignArgs</span> <span class="p">(</span><span class="n" style="color: #333;">isFFIArgumentTy</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">safety</span><span class="p">)</span> <span class="n" style="color: #333;">arg_tys</span></span>
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319
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322
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<pre style="margin: 0;"> <span id="LC322" 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;">checkSafe</span> <span class="p">(</span><span class="n" style="color: #333;">isFFIImportResultTy</span> <span class="n" style="color: #333;">dflags</span><span class="p">)</span> <span class="n" style="color: #333;">res_ty</span></span>
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320
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<pre style="margin: 0;">-<span id="LC320" class="line" lang="haskell"> <span class="n" style="color: #333;">checkMissingAmpersand</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;"><span class="idiff left right">arg_tys</span></span> <span class="n" style="color: #333;">res_ty</span></span>
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="haskell"> <span class="n" style="color: #333;">checkMissingAmpersand</span> <span class="n" style="color: #333;">dflags</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">scaledThing</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg_tys</span></span><span class="p"><span class="idiff right">)</span></span> <span class="n" style="color: #333;">res_ty</span></span>
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321
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324
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<pre style="margin: 0;"> <span id="LC324" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">target</span> <span class="kr" style="font-weight: 600;">of</span></span>
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322
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<pre style="margin: 0;"> <span id="LC325" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">StaticTarget</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kr" style="font-weight: 600;">_</span> <span class="kt" style="color: #458; font-weight: 600;">False</span></span>
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323
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326
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">not</span> <span class="p">(</span><span class="n" style="color: #333;">null</span> <span class="n" style="color: #333;">arg_tys</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="405" 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="408" 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">@@ -405,7 +408,7 @@ tcCheckFEType sig_ty (CExport (L l (CExportStatic esrc str cconv)) src) = do</td>
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<pre style="margin: 0;"> <span id="LC408" class="line" lang="haskell"> <span class="n" style="color: #333;">checkCg</span> <span class="n" style="color: #333;">checkCOrAsmOrLlvm</span></span>
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406
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409
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<pre style="margin: 0;"> <span id="LC409" class="line" lang="haskell"> <span class="n" style="color: #333;">checkTc</span> <span class="p">(</span><span class="n" style="color: #333;">isCLabelString</span> <span class="n" style="color: #333;">str</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">badCName</span> <span class="n" style="color: #333;">str</span><span class="p">)</span></span>
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410
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<pre style="margin: 0;"> <span id="LC410" class="line" lang="haskell"> <span class="n" style="color: #333;">cconv'</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">checkCConv</span> <span class="n" style="color: #333;">cconv</span></span>
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<pre style="margin: 0;">-<span id="LC408" class="line" lang="haskell"> <span class="n" style="color: #333;">checkForeignArgs</span> <span class="n" style="color: #333;">isFFIExternalTy</span> <span class="p"><span class="idiff left">(</span></span><span class="n" style="color: #333;"><span class="idiff">map</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">scaledThing</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff">arg_tys</span></span><span class="p"><span class="idiff right">)</span></span></span>
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<pre style="margin: 0;">+<span id="LC411" class="line" lang="haskell"> <span class="n" style="color: #333;">checkForeignArgs</span> <span class="n" style="color: #333;">isFFIExternalTy</span> <span class="n" style="color: #333;"><span class="idiff left right">arg_tys</span></span></span>
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<pre style="margin: 0;"> <span id="LC412" 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="LC413" 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="LC414" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</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">@@ -422,10 +425,16 @@ tcCheckFEType sig_ty (CExport (L l (CExportStatic esrc str cconv)) src) = do</td>
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<pre style="margin: 0;"> <span id="LC425" 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="LC426" class="line" lang="haskell"></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;">------------ Checking argument types for foreign import ----------------------</span></span>
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<pre style="margin: 0;">-<span id="LC425" class="line" lang="haskell"><span class="n" style="color: #333;">checkForeignArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Validity</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;">Type</span><span class="p">]</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC428" class="line" lang="haskell"><span class="n" style="color: #333;">checkForeignArgs</span> <span class="o" style="font-weight: 600;">::</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Type</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Validity</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="p">[</span><span class="kt" style="color: #458; font-weight: 600;"><span class="idiff left">Scaled</span></span><span class="idiff right"> </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;">TcM</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;"> <span id="LC429" class="line" lang="haskell"><span class="n" style="color: #333;">checkForeignArgs</span> <span class="n" style="color: #333;">pred</span> <span class="n" style="color: #333;">tys</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mapM_</span> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">tys</span></span>
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<pre style="margin: 0;"> <span id="LC430" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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<pre style="margin: 0;">-<span id="LC428" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="n" style="color: #333;">ty</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">check</span> <span class="p">(</span><span class="n" style="color: #333;">pred</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">illegalForeignTyErr</span> <span class="n" style="color: #333;">argument</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC431" class="line" lang="haskell"> <span class="n" style="color: #333;">go</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Scaled</span> <span class="n" style="color: #333;">mult</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">checkNoLinearFFI</span> <span class="n" style="color: #333;">mult</span> <span class="o" style="font-weight: 600;">>></span></span>
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<pre style="margin: 0;">+<span id="LC432" class="line" lang="haskell"> <span class="n" style="color: #333;">check</span> <span class="p">(</span><span class="n" style="color: #333;">pred</span> <span class="n" style="color: #333;">ty</span><span class="p">)</span> <span class="p">(</span><span class="n" style="color: #333;">illegalForeignTyErr</span> <span class="n" style="color: #333;">argument</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC433" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC434" class="line" lang="haskell"><span class="n" style="color: #333;">checkNoLinearFFI</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Mult</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">TcM</span> <span class="nb" style="color: #0086b3;">()</span> <span class="c1" style="color: #998; font-style: italic;">-- No linear types in FFI (#18472)</span></span>
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<pre style="margin: 0;">+<span id="LC435" class="line" lang="haskell"><span class="n" style="color: #333;">checkNoLinearFFI</span> <span class="kt" style="color: #458; font-weight: 600;">Many</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">return</span> <span class="nb" style="color: #0086b3;">()</span></span>
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<pre style="margin: 0;">+<span id="LC436" class="line" lang="haskell"><span class="n" style="color: #333;">checkNoLinearFFI</span> <span class="kr" style="font-weight: 600;">_</span> <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;">argument</span></span>
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<pre style="margin: 0;">+<span id="LC437" class="line" lang="haskell"> <span class="p">(</span><span class="n" style="color: #333;">text</span> <span class="s" style="color: #d14;">"Linear types are not supported in FFI declarations, see #18472"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC438" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC439" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">------------ Checking result types for foreign calls ----------------------</span></span>
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<pre style="margin: 0;"> <span id="LC440" class="line" lang="haskell"><span class="cd">-- | Check that the type has the form</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/160fba4aa306c0649c72a6dcd7c98d9782a0e74b#7c748bced26d07aa398acaa4bf03ba916acb63d9"><strong>testsuite/tests/linear/should_fail/LinearFFI.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 LinearTypes #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">LinearFFI</span> <span class="kr" style="font-weight: 600;">where</span> <span class="c1" style="color: #998; font-style: italic;">-- #18472</span></span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Foreign.Ptr</span></span>
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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="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;">"exp"</span> <span class="n" style="color: #333;">c_exp</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Double</span> <span class="o" style="font-weight: 600;">#-></span> <span class="kt" style="color: #458; font-weight: 600;">Double</span></span>
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<pre style="margin: 0;">+<span id="LC7" 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;">stdcall</span> <span class="s" style="color: #d14;">"dynamic"</span> <span class="n" style="color: #333;">d8</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">FunPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IO</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;">IO</span> <span class="kt" style="color: #458; font-weight: 600;">Int</span></span>
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<pre style="margin: 0;">+<span id="LC8" 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;">"wrapper"</span> <span class="n" style="color: #333;">mkF</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</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;">FunPtr</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">IO</span> <span class="nb" style="color: #0086b3;">()</span><span class="p">))</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/160fba4aa306c0649c72a6dcd7c98d9782a0e74b#520ea479966b20fb2f283b3078303b057163c15c"><strong>testsuite/tests/linear/should_fail/LinearFFI.stderr</strong></a>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="plaintext">LinearFFI.hs:6:1: error:</span>
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<pre style="margin: 0;">+<span id="LC3" class="line" lang="plaintext"> • Unacceptable argument type in foreign declaration:</span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="plaintext"> Linear types are not supported in FFI declarations, see #18472</span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="plaintext"> • When checking declaration:</span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="plaintext"> foreign import ccall safe "exp" c_exp :: Double #-> Double</span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="plaintext">LinearFFI.hs:7:1: error:</span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="plaintext"> • Unacceptable argument type in foreign declaration:</span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="plaintext"> Linear types are not supported in FFI declarations, see #18472</span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="plaintext"> • When checking declaration:</span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="plaintext"> foreign import stdcall safe "dynamic" d8</span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="plaintext"> :: FunPtr (IO Int) #-> IO Int</span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="plaintext">LinearFFI.hs:8:1: error:</span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="plaintext"> • Unacceptable argument type in foreign declaration:</span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="plaintext"> Linear types are not supported in FFI declarations, see #18472</span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="plaintext"> • When checking declaration:</span>
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<pre style="margin: 0;">+<span id="LC19" class="line" lang="plaintext"> foreign import ccall safe "wrapper" mkF</span>
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<pre style="margin: 0;">+<span id="LC20" class="line" lang="plaintext"> :: IO () #-> IO (FunPtr (IO ()))</span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/-/commit/160fba4aa306c0649c72a6dcd7c98d9782a0e74b#9eaf3d28760bfe4fb6839aeb7cad53d8f9bac1c1"><strong>testsuite/tests/linear/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">@@ -28,3 +28,4 @@ test('LinearBottomMult', normal, compile_fail, [''])</td>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearSequenceExpr</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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<pre style="margin: 0;"> <span id="LC29" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearIf</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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<pre style="margin: 0;"> <span id="LC30" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearPatternGuardWildcard</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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<pre style="margin: 0;">+<span id="LC31" class="line" lang="perl"><span class="nv" style="color: #008080;">test</span><span class="p">('</span><span class="s1" style="color: #d14;">LinearFFI</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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