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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang crashes on lambdas with arguments of invalid types derived from template arguments"
href="http://llvm.org/bugs/show_bug.cgi?id=21484">21484</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang crashes on lambdas with arguments of invalid types derived from template arguments
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rtrieu@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Code:
template<class T>
void bar(T t) {
auto x = [](typename T::ns::type &k) {};
}
class S {};
void foo() {
bar(5);
bar(S());
}
Commandline:
clang -std=c++11 test.cc
Error:
bar(5) produces:
test.cc:3:24: error: type 'int' cannot be used prior to '::' because it has no
members
auto x = [](typename T::ns::type &k) {};
^
test.cc:9:3: note: in instantiation of function template specialization
'bar<int>' requested here
bar(5);
^
bar(S()) [with bar(5) commented out] produces:
test.cc:3:27: error: no member named 'ns' in 'S'
auto x = [](typename T::ns::type &k) {};
~~~^
test.cc:10:3: note: in instantiation of function template specialization
'bar<S>' requested here
bar(S());
^
Assertion:
clang-3.6: ../tools/clang/lib/Sema/TypeLocBuilder.h:106: clang::TypeSourceInfo
*clang::TypeLocBuilder::getTypeSourceInfo(clang::ASTContext &,
clang::QualType): Assertion `T == LastTy && "type doesn't match last type
pushed!"' failed.
QualType T in the assertion is a null QualType.
I suspect that TransformLambdaExpr (which calls getTypeSoucreInfo at lint 9017
and triggers the assertion) is not handling invalid types properly along all
paths.</pre>
</div>
</p>
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