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<h3>
Ben Gamari pushed to branch wip/T15336
at <a href="https://gitlab.haskell.org/ghc/ghc">Glasgow Haskell Compiler / GHC</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/7f1ee10c677a08db087cab996b48c1ec20b766e2">7f1ee10c</a></strong>
<div>
<span>by Ben Gamari</span>
<i>at 2019-06-16T17:22:55Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">ghci: Don't rely on resolution of System.IO to base module
Previously we would hackily evaluate a textual code snippet to compute
actions to disable I/O buffering and flush the stdout/stderr handles.
This broke in a number of ways (#15336, #16563).
Instead we now ship a module (`GHC.GHCi.Helpers`) with `base` containing
the needed actions. We can then easily refer to these via `Orig` names.
</pre>
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<h4>4 changed files:</h4>
<ul>
<li class="file-stats">
<a href="#7b2a3c8a780cfa42412ee2700454599d02c3f69d">
compiler/prelude/PrelNames.hs
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</li>
<li class="file-stats">
<a href="#57d22eb49f269b51f07e23c509834d85e25f691e">
ghc/GHCi/UI/Monad.hs
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<li class="file-stats">
<a href="#d323d108fe74db3c82576e0a81b4edc5c07a5bfc">
<span class="new-file">
+
libraries/base/GHC/GHCi/Helpers.hs
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</li>
<li class="file-stats">
<a href="#b7cfb47853ef95330e499ca0c5b90964744d101f">
libraries/base/base.cabal
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<h4>Changes:</h4>
<li id="7b2a3c8a780cfa42412ee2700454599d02c3f69d">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/7f1ee10c677a08db087cab996b48c1ec20b766e2#7b2a3c8a780cfa42412ee2700454599d02c3f69d"><strong>compiler/prelude/PrelNames.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">@@ -498,7 +498,7 @@ pRELUDE :: Module</td>
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"><span class="n" style="color: #333;">pRELUDE</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule_</span> <span class="n" style="color: #333;">pRELUDE_NAME</span></span>
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499
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_PRIM</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_TYPES</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_GENERICS</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_MAGIC</span><span class="p">,</span></span>
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501
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<pre style="margin: 0;">-<span id="LC501" class="line" lang="haskell"> <span class="n" style="color: #333;">gHC_CLASSES</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_BASE</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_ENUM</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_GHCI</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_CSTRING</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC501" class="line" lang="haskell"> <span class="n" style="color: #333;">gHC_CLASSES</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_BASE</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_ENUM</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_GHCI</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_<span class="idiff left">GHCI_HELPERS</span></span><span class="p"><span class="idiff">,</span></span><span class="idiff"> </span><span class="n" style="color: #333;"><span class="idiff right">gHC_</span>CSTRING</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC502" class="line" lang="haskell"> <span class="n" style="color: #333;">gHC_SHOW</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_READ</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_NUM</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_MAYBE</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_INTEGER_TYPE</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_NATURAL</span><span class="p">,</span></span>
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503
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="haskell"> <span class="n" style="color: #333;">gHC_LIST</span><span class="p">,</span> <span class="n" style="color: #333;">gHC_TUPLE</span><span class="p">,</span> <span class="n" style="color: #333;">dATA_TUPLE</span><span class="p">,</span> <span class="n" style="color: #333;">dATA_EITHER</span><span class="p">,</span> <span class="n" style="color: #333;">dATA_STRING</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="haskell"> <span class="n" style="color: #333;">dATA_FOLDABLE</span><span class="p">,</span> <span class="n" style="color: #333;">dATA_TRAVERSABLE</span><span class="p">,</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -520,6 +520,7 @@ gHC_CLASSES = mkPrimModule (fsLit "GHC.Classes")</td>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_BASE</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.Base"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_ENUM</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.Enum"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_GHCI</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.GHCi"</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC523" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_GHCI_HELPERS</span><span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.GHCi.Helpers"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC524" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_SHOW</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.Show"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC525" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_READ</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.Read"</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC526" class="line" lang="haskell"><span class="n" style="color: #333;">gHC_NUM</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkBaseModule</span> <span class="p">(</span><span class="n" style="color: #333;">fsLit</span> <span class="s" style="color: #d14;">"GHC.Num"</span><span class="p">)</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -41,6 +41,7 @@ import qualified GHC</td>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">GhcMonad</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">liftIO</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">Outputable</span> <span class="k" style="font-weight: 600;">hiding</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">printForUser</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">printForUserPartWay</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC43" 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;">Outputable</span></span>
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<pre style="margin: 0;">+<span id="LC44" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">OccName</span></span>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">DynFlags</span></span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">FastString</span></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">HscTypes</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">@@ -488,13 +489,11 @@ revertCAFs = do</td>
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<pre style="margin: 0;"> <span id="LC489" class="line" lang="haskell"><span class="cd">-- | Compile "hFlush stdout; hFlush stderr" once, so we can use it repeatedly</span></span>
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<pre style="margin: 0;"> <span id="LC490" class="line" lang="haskell"><span class="n" style="color: #333;">initInterpBuffering</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">Ghc</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">ForeignHValue</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignHValue</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC491" class="line" lang="haskell"><span class="n" style="color: #333;">initInterpBuffering</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="LC491" class="line" lang="haskell"> <span class="n" style="color: #333;">nobuf</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">compileGHCiExpr</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC492" class="line" lang="haskell"> <span class="s" style="color: #d14;">"do { System.IO.hSetBuffering System.IO.stdin System.IO.NoBuffering; "</span> <span class="o" style="font-weight: 600;">++</span></span>
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<pre style="margin: 0;">-<span id="LC493" class="line" lang="haskell"> <span class="s" style="color: #d14;">" System.IO.hSetBuffering System.IO.stdout System.IO.NoBuffering; "</span> <span class="o" style="font-weight: 600;">++</span></span>
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<pre style="margin: 0;">-<span id="LC494" class="line" lang="haskell"> <span class="s" style="color: #d14;">" System.IO.hSetBuffering System.IO.stderr System.IO.NoBuffering }"</span></span>
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<pre style="margin: 0;">-<span id="LC495" class="line" lang="haskell"> <span class="n" style="color: #333;">flush</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">compileGHCiExpr</span> <span class="o" style="font-weight: 600;">$</span></span>
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<pre style="margin: 0;">-<span id="LC496" class="line" lang="haskell"> <span class="s" style="color: #d14;">"do { System.IO.hFlush System.IO.stdout; "</span> <span class="o" style="font-weight: 600;">++</span></span>
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<pre style="margin: 0;">-<span id="LC497" class="line" lang="haskell"> <span class="s" style="color: #d14;">" System.IO.hFlush System.IO.stderr }"</span></span>
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<pre style="margin: 0;">+<span id="LC492" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">let</span> <span class="n" style="color: #333;">mkHelperExpr</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">OccName</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">Ghc</span> <span class="kt" style="color: #458; font-weight: 600;">ForeignHValue</span></span>
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<pre style="margin: 0;">+<span id="LC493" class="line" lang="haskell"> <span class="n" style="color: #333;">mkHelperExpr</span> <span class="n" style="color: #333;">occ</span> <span class="o" style="font-weight: 600;">=</span></span>
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<pre style="margin: 0;">+<span id="LC494" class="line" lang="haskell"> <span class="n" style="color: #333;">compileParsedExprRemote</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">nlHsVar</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkOrig</span> <span class="n" style="color: #333;">gHC_GHCI_HELPERS</span> <span class="n" style="color: #333;">occ</span></span>
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<pre style="margin: 0;">+<span id="LC495" class="line" lang="haskell"> <span class="n" style="color: #333;">nobuf</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkHelperExpr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkVarOcc</span> <span class="s" style="color: #d14;">"disableBuffering"</span></span>
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<pre style="margin: 0;">+<span id="LC496" class="line" lang="haskell"> <span class="n" style="color: #333;">flush</span> <span class="o" style="font-weight: 600;"><-</span> <span class="n" style="color: #333;">mkHelperExpr</span> <span class="o" style="font-weight: 600;">$</span> <span class="n" style="color: #333;">mkVarOcc</span> <span class="s" style="color: #d14;">"flushAll"</span></span>
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<pre style="margin: 0;"> <span id="LC497" class="line" lang="haskell"> <span class="n" style="color: #333;">return</span> <span class="p">(</span><span class="n" style="color: #333;">nobuf</span><span class="p">,</span> <span class="n" style="color: #333;">flush</span><span class="p">)</span></span>
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498
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<pre style="margin: 0;"> <span id="LC498" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="haskell"><span class="cd">-- | Invoke "hFlush stdout; hFlush stderr" in the interpreter</span></span>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/7f1ee10c677a08db087cab996b48c1ec20b766e2#d323d108fe74db3c82576e0a81b4edc5c07a5bfc"><strong>libraries/base/GHC/GHCi/Helpers.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 NoImplicitPrelude #-}</span></span>
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<pre style="margin: 0;">+<span id="LC2" class="line" lang="haskell"><span class="cp" style="color: #999; font-weight: 600;">{-# OPTIONS_HADDOCK not-home #-}</span></span>
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<pre style="margin: 0;">+<span id="LC4" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC5" class="line" lang="haskell"><span class="cd">-- |</span></span>
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<pre style="margin: 0;">+<span id="LC6" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Module : GHC.GHCi.Helpers</span></span>
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<pre style="margin: 0;">+<span id="LC7" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Copyright : (c) The University of Glasgow 2012</span></span>
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<pre style="margin: 0;">+<span id="LC8" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- License : see libraries/base/LICENSE</span></span>
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<pre style="margin: 0;">+<span id="LC9" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC10" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Maintainer : cvs-ghc@haskell.org</span></span>
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<pre style="margin: 0;">+<span id="LC11" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Stability : internal</span></span>
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<pre style="margin: 0;">+<span id="LC12" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Portability : non-portable (GHC Extensions)</span></span>
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<pre style="margin: 0;">+<span id="LC13" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC14" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-- Various helpers used by the GHCi shell.</span></span>
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<pre style="margin: 0;">+<span id="LC15" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">--</span></span>
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<pre style="margin: 0;">+<span id="LC16" class="line" lang="haskell"><span class="c1" style="color: #998; font-style: italic;">-----------------------------------------------------------------------------</span></span>
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<pre style="margin: 0;">+<span id="LC17" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC18" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">module</span> <span class="nn" style="color: #555;">GHC.GHCi.Helpers</span> <span class="p">(</span><span class="nf" style="color: #900; font-weight: 600;">disableBuffering</span><span class="p">,</span> <span class="nf" style="color: #900; font-weight: 600;">flushAll</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">where</span></span>
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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="kr" style="font-weight: 600;">import</span> <span class="nn" style="color: #555;">System.IO</span></span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC22" class="line" lang="haskell"><span class="n" style="color: #333;">disableBuffering</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>
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<pre style="margin: 0;">+<span id="LC23" class="line" lang="haskell"><span class="n" style="color: #333;">disableBuffering</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="LC24" class="line" lang="haskell"> <span class="n" style="color: #333;">hSetBuffering</span> <span class="n" style="color: #333;">stdin</span> <span class="kt" style="color: #458; font-weight: 600;">NoBuffering</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="haskell"> <span class="n" style="color: #333;">hSetBuffering</span> <span class="n" style="color: #333;">stdout</span> <span class="kt" style="color: #458; font-weight: 600;">NoBuffering</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="haskell"> <span class="n" style="color: #333;">hSetBuffering</span> <span class="n" style="color: #333;">stderr</span> <span class="kt" style="color: #458; font-weight: 600;">NoBuffering</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="haskell"></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="haskell"><span class="n" style="color: #333;">flushAll</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>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="haskell"><span class="n" style="color: #333;">flushAll</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="LC30" class="line" lang="haskell"> <span class="n" style="color: #333;">hFlush</span> <span class="n" style="color: #333;">stdout</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="haskell"> <span class="n" style="color: #333;">hFlush</span> <span class="n" style="color: #333;">stderr</span></span></pre>
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<a href="https://gitlab.haskell.org/ghc/ghc/commit/7f1ee10c677a08db087cab996b48c1ec20b766e2#b7cfb47853ef95330e499ca0c5b90964744d101f"><strong>libraries/base/base.cabal</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">@@ -230,6 +230,7 @@ Library</td>
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<pre style="margin: 0;"> <span id="LC230" class="line" lang="plaintext"> GHC.Foreign</span>
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<pre style="margin: 0;"> <span id="LC231" class="line" lang="plaintext"> GHC.ForeignPtr</span>
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<pre style="margin: 0;"> <span id="LC232" class="line" lang="plaintext"> GHC.GHCi</span>
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<pre style="margin: 0;">+<span id="LC233" class="line" lang="plaintext"> GHC.GHCi.Helpers</span>
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<pre style="margin: 0;"> <span id="LC234" class="line" lang="plaintext"> GHC.Generics</span>
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<pre style="margin: 0;"> <span id="LC235" class="line" lang="plaintext"> GHC.IO</span>
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<pre style="margin: 0;"> <span id="LC236" class="line" lang="plaintext"> GHC.IO.Buffer</span>
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