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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang accepts invalid code"
href="https://bugs.llvm.org/show_bug.cgi?id=42203">42203</a>
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<th>Summary</th>
<td>clang accepts invalid code
</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>enhancement
</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
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<th>Reporter</th>
<td>zhonghao@pku.org.cn
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>My clang is 9.0.0, and the code is:
enum class A : unsigned long long {
z = (unsigned long long)-1
};
const A c{ A::z };
template <enum A : unsigned long long > struct Q {};
Q<c> j;
clang accepts the code. ICC rejects it:
<source>(5): error: an opaque enum declaration cannot be part of another
declaration
template <enum A : unsigned long long > struct Q {};
^
<source>(6): error: argument of type "A" is incompatible with template
parameter of type "A"
Q<c> j;
^
compilation aborted for <source> (code 2)
Compiler returned: 2
gcc also rejects it:
<source>:5:39: error: expected ';' or '{' before '>' token
5 | template <enum A : unsigned long long > struct Q {};
| ^
<source>:5:39: error: expected class-key before '>' token
<source>:6:4: note: invalid template non-type parameter
6 | Q<c> j;
| ^
Compiler returned: 1</pre>
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