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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "Broken nested name specifier"' failed"
href="https://bugs.llvm.org/show_bug.cgi?id=47842">47842</a>
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<th>Summary</th>
<td>"Broken nested name specifier"' failed
</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>
</tr>
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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>tangyixuan@mail.dlut.edu.cn
</td>
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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>Hi, the following code is ill-formed. Besides error diagnostics, clang also
crashes. However, I suffer two questions:
1. If the user-defined name 'NamespaceDeclA' is replaced with other name, such
as a simple name 'A', clang would not crash.
2. Following the suggestions of the error diagnostics, the error in code would
not be fixed while other error diagnostics would appear.
$ cat s.cpp
namespace NamespaceDeclA {
struct S {} S ;
}
struct NamespaceDeclA :: S :: NamespaceDeclB :: S {};
$ clang++ -c s.cpp
s.cpp:4:8: error: no member named 'NamespaceDeclB' in 'NamespaceDeclA::S'; did
you mean 'NamespaceDeclA'?
struct NamespaceDeclA :: S :: NamespaceDeclB :: S {};
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NamespaceDeclA
s.cpp:1:11: note: 'NamespaceDeclA' declared here
namespace NamespaceDeclA {
^
clang++:
/home/oscar/compiler/llvm-project/clang/lib/AST/NestedNameSpecifier.cpp:79:
static clang::NestedNameSpecifier* clang::NestedNameSpecifier::Create(const
clang::ASTContext&, clang::NestedNameSpecifier*, const clang::NamespaceDecl*):
Assertion `(!Prefix || (Prefix->getAsType() == nullptr &&
Prefix->getAsIdentifier() == nullptr)) && "Broken nested name specifier"'
failed.
PLEASE submit a bug report to <a href="https://bugs.llvm.org/">https://bugs.llvm.org/</a> and include the crash
backtrace, preprocessed source, and associated run script.
Stack dump:
0. Program arguments: /usr/local/bin/clang++ -std=c++2a -c 502-14-1.C
1. 502-14-1.C:4:49: current parser token 'S'
#0 0x00005641af7729e0 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int)
/home/oscar/compiler/llvm-project/llvm/lib/Support/Unix/Signals.inc:563:0
#1 0x00005641af772a84 PrintStackTraceSignalHandler(void*)
/home/oscar/compiler/llvm-project/llvm/lib/Support/Unix/Signals.inc:627:0
#2 0x00005641af77083b llvm::sys::RunSignalHandlers()
/home/oscar/compiler/llvm-project/llvm/lib/Support/Signals.cpp:70:0</pre>
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