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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - wrong tokenization around invalid UCNs"
href="http://llvm.org/bugs/show_bug.cgi?id=20312">20312</a>
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<th>Summary</th>
<td>wrong tokenization around invalid UCNs
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</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>
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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>richard-llvm@metafoo.co.uk
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Consider:
#define X(a) y##a
#define yx Q(
#define Q(x)
X(x\u200e))
This code is ill-formed: it contains the identifier token 'x\u200e' which
contains the UCN '\u200e' which is not permitted in an identifier.
Clang treats this as two tokens instead, and as a result accepts the above
ill-formed code. This similar case is correctly rejected:
X(x\u0065))</pre>
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