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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>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.haskell.org/ghc/ghc/commit/e7cad16c19fb226353d3fb6e92914ed953d32857">e7cad16c</a></strong>
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<span>by Krzysztof Gogolewski</span>
<i>at 2019-04-14T12:49:23Z</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Add a safeguard to Core Lint
Lint returns a pair (Maybe a, WarnsAndErrs). The Maybe monad
allows to handle an unrecoverable failure.
In case of such a failure, the error should be added to the second
component of the pair. If this is not done, Lint will silently
accept bad programs. This situation actually happened during
development of linear types. This adds a safeguard.
</pre>
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<h4>1 changed file:</h4>
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<li class="file-stats">
<a href="#da5742c4b404a672740f0eef71683f5a8dd3818e">
compiler/coreSyn/CoreLint.hs
</a>
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<h4>Changes:</h4>
<li id="da5742c4b404a672740f0eef71683f5a8dd3818e">
<a href="https://gitlab.haskell.org/ghc/ghc/commit/e7cad16c19fb226353d3fb6e92914ed953d32857#da5742c4b404a672740f0eef71683f5a8dd3818e"><strong>compiler/coreSyn/CoreLint.hs</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="2080" 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">@@ -2080,7 +2080,7 @@ defaultLintFlags = LF { lf_check_global_ids = False</td>
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2080
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<pre style="margin: 0;"> <span id="LC2080" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">newtype</span> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="n" style="color: #333;">a</span> <span class="o" style="font-weight: 600;">=</span></span>
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2081
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<pre style="margin: 0;"> <span id="LC2081" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LintM</span> <span class="p">{</span> <span class="n" style="color: #333;">unLintM</span> <span class="o" style="font-weight: 600;">::</span></span>
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2082
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<pre style="margin: 0;"> <span id="LC2082" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">LintEnv</span> <span class="o" style="font-weight: 600;">-></span></span>
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2083
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<pre style="margin: 0;">-<span id="LC2083" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">WarnsAndErrs</span> <span class="o" style="font-weight: 600;">-></span> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Error and warning</span> messages so far</span></span>
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2083
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<pre style="margin: 0;">+<span id="LC2083" class="line" lang="haskell"> <span class="kt" style="color: #458; font-weight: 600;">WarnsAndErrs</span> <span class="o" style="font-weight: 600;">-></span> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Warning and error</span> messages so far</span></span>
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2084
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<pre style="margin: 0;"> <span id="LC2084" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Maybe</span> <span class="n" style="color: #333;">a</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">WarnsAndErrs</span><span class="p">)</span> <span class="p">}</span> <span class="c1" style="color: #998; font-style: italic;">-- Result and messages (if any)</span></span>
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2085
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<pre style="margin: 0;"> <span id="LC2085" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2086" class="line" lang="haskell"><span class="kr" style="font-weight: 600;">type</span> <span class="kt" style="color: #458; font-weight: 600;">WarnsAndErrs</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">MsgDoc</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">Bag</span> <span class="kt" style="color: #458; font-weight: 600;">MsgDoc</span><span class="p">)</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="2189" 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="2189" 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">@@ -2189,10 +2189,13 @@ data LintLocInfo</td>
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<pre style="margin: 0;"> <span id="LC2189" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="kt" style="color: #458; font-weight: 600;">InCo</span> <span class="kt" style="color: #458; font-weight: 600;">Coercion</span> <span class="c1" style="color: #998; font-style: italic;">-- Inside a coercion</span></span>
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<pre style="margin: 0;"> <span id="LC2190" class="line" lang="haskell"></span>
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<pre style="margin: 0;"> <span id="LC2191" class="line" lang="haskell"><span class="n" style="color: #333;">initL</span> <span class="o" style="font-weight: 600;">::</span> <span class="kt" style="color: #458; font-weight: 600;">DynFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintFlags</span> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">InScopeSet</span></span>
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<pre style="margin: 0;">-<span id="LC2192" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</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;">WarnsAndErrs</span> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Errors and warning</span>s</span></span>
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<pre style="margin: 0;">+<span id="LC2192" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">-></span> <span class="kt" style="color: #458; font-weight: 600;">LintM</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;">WarnsAndErrs</span> <span class="c1" style="color: #998; font-style: italic;">-- <span class="idiff left right">Warnings and error</span>s</span></span>
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<pre style="margin: 0;"> <span id="LC2193" class="line" lang="haskell"><span class="n" style="color: #333;">initL</span> <span class="n" style="color: #333;">dflags</span> <span class="n" style="color: #333;">flags</span> <span class="n" style="color: #333;">in_scope</span> <span class="n" style="color: #333;">m</span></span>
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<pre style="margin: 0;"> <span id="LC2194" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">=</span> <span class="kr" style="font-weight: 600;">case</span> <span class="n" style="color: #333;">unLintM</span> <span class="n" style="color: #333;">m</span> <span class="n" style="color: #333;">env</span> <span class="p">(</span><span class="n" style="color: #333;">emptyBag</span><span class="p">,</span> <span class="n" style="color: #333;">emptyBag</span><span class="p">)</span> <span class="kr" style="font-weight: 600;">of</span></span>
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<pre style="margin: 0;">-<span id="LC2195" class="line" lang="haskell"> <span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">errs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">errs</span></span>
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<pre style="margin: 0;">+<span id="LC2195" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Just</span> <span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">errs</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">errs</span></span>
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2196
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<pre style="margin: 0;">+<span id="LC2196" class="line" lang="haskell"> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">Nothing</span><span class="p">,</span> <span class="n" style="color: #333;">errs</span><span class="o" style="font-weight: 600;">@</span><span class="p">(</span><span class="kr" style="font-weight: 600;">_</span><span class="p">,</span> <span class="n" style="color: #333;">e</span><span class="p">))</span> <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;">isEmptyBag</span> <span class="n" style="color: #333;">e</span><span class="p">)</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">errs</span></span>
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2197
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<pre style="margin: 0;">+<span id="LC2197" class="line" lang="haskell"> <span class="o" style="font-weight: 600;">|</span> <span class="n" style="color: #333;">otherwise</span> <span class="o" style="font-weight: 600;">-></span> <span class="n" style="color: #333;">pprPanic</span> <span class="p">(</span><span class="s" style="color: #d14;">"Bug in Lint: a failure occurred "</span> <span class="o" style="font-weight: 600;">++</span></span>
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2198
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<pre style="margin: 0;">+<span id="LC2198" class="line" lang="haskell"> <span class="s" style="color: #d14;">"without reporting an error message"</span><span class="p">)</span> <span class="n" style="color: #333;">empty</span></span>
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2196
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2199
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<pre style="margin: 0;"> <span id="LC2199" class="line" lang="haskell"> <span class="kr" style="font-weight: 600;">where</span></span>
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2197
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2200
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<pre style="margin: 0;"> <span id="LC2200" class="line" lang="haskell"> <span class="n" style="color: #333;">env</span> <span class="o" style="font-weight: 600;">=</span> <span class="kt" style="color: #458; font-weight: 600;">LE</span> <span class="p">{</span> <span class="n" style="color: #333;">le_flags</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">flags</span></span>
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2198
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2201
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<pre style="margin: 0;"> <span id="LC2201" class="line" lang="haskell"> <span class="p">,</span> <span class="n" style="color: #333;">le_subst</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">mkEmptyTCvSubst</span> <span class="n" style="color: #333;">in_scope</span></span>
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