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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Precompiled header with alias template and decltype in a template class crash clang"
href="http://llvm.org/bugs/show_bug.cgi?id=18806">18806</a>
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<th>Summary</th>
<td>Precompiled header with alias template and decltype in a template class crash clang
</td>
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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>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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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++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>st@quanttec.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Compiling the two simple files below with
clang++ -std=c++11 -x c++-header -o test.hpp.pch test.hpp
clang++ -std=c++11 -include-pch test.hpp.pch -include test.hpp test.cpp
triggers a crash caused by the following assert error
llvm/tools/clang/lib/AST/ASTContext.cpp:3046: clang::QualType
clang::ASTContext::getSubstTemplateTypeParmType(const
clang::TemplateTypeParmType*, clang::QualType) const: Assertion
`Replacement.isCanonical() && "replacement types must always be canonical"'
failed.
-- test.hpp --
template <typename T>
using Id = T;
template <typename X>
struct Class1 {
private:
template <typename Y,
typename = decltype(Y())>
struct Nested1;
};
template <typename A>
struct Class2 {
template <typename B,
typename = Id<decltype(B())>>
struct Nested2;
};
-- test.cpp --
Class2<char> test;</pre>
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