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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Syntax error for "new struct" inside conditional-expression"
href="https://bugs.llvm.org/show_bug.cgi?id=34993">34993</a>
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<th>Summary</th>
<td>Syntax error for "new struct" inside conditional-expression
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</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>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>zeratul976@hotmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<pre>This code does not compile with clang:
struct A {};
struct A* b = (1 == 1) ? new struct A : new struct A;
The error message suggests that it's trying to parse "struct A :" as a
class-specifier, with the ":" starting the base-clause.
I believe that this is valid, at least since DR 2141 [1], which introduced the
"defining-type-specifier" grammar production. A "new-type-id" can only contain
a "type-specifier", not a "defining-type-specifier", and a "class-specifier" is
only valid as a "defining-type-specifier", so I don't believe clang should be
trying to parse a "class-specifier" at all. (Instead, the "struct A" should be
parsed as an "elaborate-type-specifier", which is a valid "type-specifier".)
(I'm not convinced that the code was invalid even before DR 2141 - I would have
thought that, having tried and failed to parse a "class-specifier", the
compiler would backtrack and try to parse an "elaborate-type-specifier" instead
- but I'm less confident about that.)
[1] <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#2141">http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#2141</a></pre>
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