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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Bogus "deduced type is not a specialization of template 'S'" on qualified name or alias in deduction guide"
href="https://bugs.llvm.org/show_bug.cgi?id=47412">47412</a>
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<th>Summary</th>
<td>Bogus "deduced type is not a specialization of template 'S'" on qualified name or alias in deduction guide
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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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
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>arthur.j.odwyer@gmail.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>// <a href="https://godbolt.org/z/enb44j">https://godbolt.org/z/enb44j</a>
namespace N {
template<class> struct S {};
auto foo() -> N::S<int>; // OK
S() -> N::S<int>; // Bogus error
} // namespace
template<class> struct S {};
auto foo() -> ::S<int>; // OK
S() -> ::S<int>; // Bogus error
using SA = S<int>;
S() -> SA; // Bogus error
This code is obviously "silly", but GCC and MSVC both agree that it is valid
C++17. Clang complains:
test.cpp:5:8: error: deduced type 'N::S<int>' of deduction guide is not a
specialization of template 'S'
S() -> N::S<int>; // Bogus error
^~~~~~~~~
test.cpp:10:8: error: deduced type '::S<int>' of deduction guide is not a
specialization of template 'S'
S() -> ::S<int>; // Bogus error
^~~~~~~~
test.cpp:13:8: error: deduced type 'N::SA' (aka 'S<int>') of deduction guide is
not a specialization of template 'S'
S() -> SA; // Bogus error
^~</pre>
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