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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Incorrect "expression is not assignable" error for dependent __is_[X_]assignable type trait expressions in function template signatures"
href="https://bugs.llvm.org/show_bug.cgi?id=35627">35627</a>
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<th>Summary</th>
<td>Incorrect "expression is not assignable" error for dependent __is_[X_]assignable type trait expressions in function template signatures
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>5.0
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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
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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>thonerma@synopsys.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, sig-rnd-sat-clang-bugs@synopsys.com
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<p>
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<pre>This issue reproduces for Clang 3.2-5.0 and current Clang 6.0 trunk.
Clang appears to incorrectly parse dependent __is_assignable,
__is_nothrow_assignable, and __is_trivially_assignable type trait helper
expressions that appear within the signature of a function template. The
following test case fails for each of these traits:
$ cat t.cpp
template<typename T>
decltype(__is_assignable(T,T)) ft();
auto x = &ft<int>;
$ clang --version
clang version 6.0.0 (trunk 312994)
Target: x86_64-unknown-linux-gnu
...
$ clang -c -fms-extensions -std=c++11 t.cpp
t.cpp:2:29: error: expression is not assignable
decltype(__is_assignable(T,T)) ft();
^
1 error generated.</pre>
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