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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - crash on invalid in preprocessor lexer"
href="http://llvm.org/bugs/show_bug.cgi?id=17804">17804</a>
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<th>Summary</th>
<td>crash on invalid in preprocessor lexer
</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>normal
</td>
</tr>
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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>nlewycky@google.com
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</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>clang: TokenLexer.cpp:194: void clang::TokenLexer::ExpandFunctionArguments():
Assertion `ArgNo != -1 && "Token following # is not an argument?"' failed.
Testcase:
#define LOG_ON_ERROR(lvl) ::X x## #__LINE__;
LOG_ON_ERROR(0);
clang -E is sufficient to trigger the crash.</pre>
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