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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - assertion failure assigning to immutable generic lambda init-capture"
href="http://llvm.org/bugs/show_bug.cgi?id=20717">20717</a>
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<th>Summary</th>
<td>assertion failure assigning to immutable generic lambda init-capture
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++1y
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This testcase:
auto x = [i = 0](auto n) { return i += n; }(1);
... causes clang to assert in C++14 mode:
clang-3.5: include/llvm/Support/Casting.h:95: static bool
llvm::isa_impl_cl<clang::Decl, const clang::DeclCo
ntext *>::doit(const From *) [To = clang::Decl, From = const clang::DeclContext
*]: Assertion `Val && "isa<> used on a null pointer"' failed.
The bad cast<...> call on a null pointer is here:
#9 0x000000000260cdc5 in clang::DeclContext::getParent (this=0x0)
at tools/clang/include/clang/AST/DeclBase.h:1090
#10 0x0000000003866b0f in isReferenceToNonConstCapture (S=..., E=0x5c97798)
at tools/clang/lib/Sema/SemaExpr.cpp:8487
#11 0x00000000037bc06a in CheckForModifiableLvalue (E=0x5c97798, Loc=...,
S=...)
at tools/clang/lib/Sema/SemaExpr.cpp:8515</pre>
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