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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - explicit specialization declarations don't work if they appear after the template-id is mentioned"
href="http://llvm.org/bugs/show_bug.cgi?id=22670">22670</a>
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<th>Summary</th>
<td>explicit specialization declarations don't work if they appear after the template-id is mentioned
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Consider:
template<int> struct A {};
typedef A<1> A1;
template<> struct A<1>;
void f() { delete (A1*)0; }
template<> struct A<1> {};
Clang rejects this saying:
<stdin>:5:19: error: redefinition of 'A<1>'
template<> struct A<1> {};
^~~~
<stdin>:1:22: note: previous definition is here
template<int> struct A {};
^
But that's wrong: we should not have instantiated A<1> from the primary
template because we have a declaration of an explicit specialization for A<1>.
Instead, we should have treated the delete-expression as deleting an incomplete
type.
Creating the template-id A<1> should not cause the implicit instantiation of
A<1>, so we are not required to first declare the explicit specialization. And
even if we were incorrectly doing so, we should instead diagnose this as:
<stdin>:3:19: error: explicit specialization of 'A<1>' after instantiation
template<> struct A<1>;
^~~~
<stdin>:2:9: note: implicit instantiation first required here
typedef A<1> A1;
^</pre>
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