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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - bad diagnostic on conflicting forward declaration"
href="http://llvm.org/bugs/show_bug.cgi?id=19216">19216</a>
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<th>Summary</th>
<td>bad diagnostic on conflicting forward declaration
</td>
</tr>
<tr>
<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>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>nlewycky@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This has a great diagnostic:
namespace llvm {
struct StringRef {};
}
namespace clang {
struct StringRef;
using llvm::StringRef;
void f(StringRef sr);
}
x.cc:6:15: error: target of using declaration conflicts with declaration
already
in scope
using llvm::StringRef;
^
x.cc:2:10: note: target of using declaration
struct StringRef {};
^
x.cc:5:10: note: conflicting declaration
struct StringRef;
^
1 error generated.
We should do something like that when we have a forward declaration that
conflicts with a using declaration. Here's what we get instead:
x.cc:8:10: error: reference to 'StringRef' is ambiguous
void f(StringRef sr);
^
x.cc:6:10: note: candidate found by name lookup is 'clang::StringRef'
struct StringRef;
^
x.cc:5:15: note: candidate found by name lookup is 'clang::StringRef'
using llvm::StringRef;
^
1 error generated.
That's confusing.</pre>
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