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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - coroutine_handle::done() == false after promise's unhandled_exception() has thrown"
href="https://bugs.llvm.org/show_bug.cgi?id=48770">48770</a>
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<th>Summary</th>
<td>coroutine_handle::done() == false after promise's unhandled_exception() has thrown
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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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
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>m.krause@tu-harburg.de
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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>Created <span class=""><a href="attachment.cgi?id=24386" name="attach_24386" title="Reproducer">attachment 24386</a> <a href="attachment.cgi?id=24386&action=edit" title="Reproducer">[details]</a></span>
Reproducer
[dcl.fct.def.coroutine]/14 says: "If the evaluation of the expression
promise.unhandled_exception() exits via
an exception, the coroutine is considered suspended at the final suspend
point". So, after this exception has
propagated to the caller, I expect that the coroutine_handle's done() function
returns true (because of
[coroutine.handle.observers]/3 "Returns: true if the coroutine is suspended at
its final suspend point,
otherwise false").
However, the compiler for which I am reporting this makes done() return false
in this situation. See the
attached example code (my expectation is 1 instead of 0 in the final two lines
of output).
By the way, gcc 10.2, gcc trunk, clang 10.0.0, clang trunk, msvc 14.28 all
behave in this way. A fix for msvc
is already underway:
<a href="https://developercommunity.visualstudio.com/content/problem/1305540/coroutine-handledone-false-after-promises-unhandle.html">https://developercommunity.visualstudio.com/content/problem/1305540/coroutine-handledone-false-after-promises-unhandle.html</a></pre>
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