<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/88920>88920</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            llvm/include/llvm/ADT/ArrayRef.h:169: const T& llvm::ArrayRef<T>::front() const [with T = llvm::Value*]: Assertion `!empty()' failed.
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            c++,
            crash-on-valid
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          dcb314
      </td>
    </tr>
</table>

<pre>
    From some fedora code compiled today with today's version of clang++,
I get this stack backtrace:

 #0 0x0000000001ef02eb llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/dcb38/llvm/trunk/llv
m/lib/Support/Unix/Signals.inc:723:22
 #1 0x0000000001eed49b llvm::sys::RunSignalHandlers() /home/dcb38/llvm/trunk/llvm/lib/Support/Signals
.cpp:105:20
 #2 0x0000000001eed5c5 SignalHandler(int) /home/dcb38/llvm/trunk/llvm/lib/Support/Unix/Signals.inc:41
3:1
 #3 0x00007f2ffd25fbb0 __restore_rt (/lib64/libc.so.6+0x3dbb0)
 #4 0x00007f2ffd2b0884 __pthread_kill_implementation (/lib64/libc.so.6+0x8e884)
 #5 0x00007f2ffd25fafe gsignal (/lib64/libc.so.6+0x3dafe)
 #6 0x00007f2ffd24887f abort (/lib64/libc.so.6+0x2687f)
 #7 0x00007f2ffd24879b _nl_load_domain.cold (/lib64/libc.so.6+0x2679b)
 #8 0x00007f2ffd258187 (/lib64/libc.so.6+0x36187)
 #9 0x000000000386dc04 llvm::DebugEpochBase::incrementEpoch() /home/dcb38/llvm/trunk/llvm/include/llv
m/ADT/EpochTracker.h:45:27
#10 0x000000000386dc04 llvm::detail::DenseSetPair<std::pair<llvm::Value*, llvm::Value*>>* llvm::Dense
MapBase<llvm::DenseMap<std::pair<llvm::Value*, llvm::Value*>, llvm::detail::DenseSetEmpty, llvm::Dens
eMapInfo<std::pair<llvm::Value*, llvm::Value*>, void>, llvm::detail::DenseSetPair<std::pair<llvm::Val
ue*, llvm::Value*>>>, std::pair<llvm::Value*, llvm::Value*>, llvm::detail::DenseSetEmpty, llvm::Dense
MapInfo<std::pair<llvm::Value*, llvm::Value*>, void>, llvm::detail::DenseSetPair<std::pair<llvm::Valu
e*, llvm::Value*>>>::InsertIntoBucketImpl<std::pair<llvm::Value*, llvm::Value*>>(std::pair<llvm::Valu
e*, llvm::Value*> const&, std::pair<llvm::Value*, llvm::Value*> const&, llvm::detail::DenseSetPair<st
d::pair<llvm::Value*, llvm::Value*>>*) /home/dcb38/llvm/trunk/llvm/include/llvm/ADT/DenseMap.h:594:19

[audio-688c11.cpp.gz](https://github.com/llvm/llvm-project/files/14999398/audio-688c11.cpp.gz)
[audio-688c11.sh.gz](https://github.com/llvm/llvm-project/files/14999400/audio-688c11.sh.gz)

</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzMV99v4ygQ_mvIC2qEwT_wQx6cZqPrw0qr3d69RhjGMVdsLMDd7f31J-zmUkdVm72udBdZiT2Gb775GIaJ8F4fe4ANyrYo263EGFrrNkrWLElXtVVPm72zHfa2A9yAsk5gaRVgabtBG1A4WCWe8Hcd2vkW0cLjR3Be2x7bBksj-iOi2-m6RWSHSHWHjxBwaLXHPgj5gGshH4ITEhCr5iHzN0aUEUx-kNMngYZQqLExj10cyyr_5OebL0734VuEu5-QKD8PcuL7wfrgQHSI5ojeYt0HREuM6L61HSC6jyFzRPfTJLoPbuwf5seZSjQaXSO6_zYOg3UB0f3vvf4RDfrYC-PXupeIVQVliFWUniNIlhGASstXI_g69jPUb6JXBpxHlF9L8jV6z7xmIms5DIhVCckiO3JmRy_ZZTLDCx6I8p-Q62qh0mQmEeVKznzYM5-ioU2jaNbUNcGHgwMfrIODC3iSJfrI0_lXrr1d54huyQ-m6pogWp7x0iVeTThP8eEwhNaBUIcHbcxBd4OBDvogQkzbtxxw4DxdOMguCYsG8NFPsb7DVTSwgMqXUCnnRYNFbd8Jmua8aBZAxSVQUdb40JuDsUIdlO2E7tfSGvUOblHWC1x-EStPePF2jHnCiwVE-TLfGM-VJOmL3bCDejx-Gqxst8LDbNO9dNPyTPaf3BW6l2ZUcLmXq909ovsJMNaLB3DrNibltD2K5yJEWULepqsgCG1O1HsP3yB8EdohduuDmu3D_Hye9IcwIyBaxUL0ipV9ihetFqr0HmZSn8UwK3N78fqzGD7odfHitcg-dUN4Wg6Lr2ZikcBd39iPk3i0Wl3F5xqlZ3Lv6z37-y_kOy_s_1C-8Xlxr5BvMt_1Hly464PdjvIBwl03mF-wGfiHSWJpex-ej_8P0FngXKnvTO-D5eBfF71zuTvVianUZWUaT97yZcOFsq0YlbY3OecySWLTsD7-hbIdorwNYZg6FbpHdH_UoR3rtbTdi2PfPHY3g7N_goynfqMNeET3SVqWJSsj29fAT4fDpW_f_iLXKSGXrmfsk-eV2jBVslKsYJMUCaOc5oys2g2QFERDapnwhKeqYU3GBU9rkkOpCiFXekMJTUma5EmWEUbWZc6BMcmKPCvTLE1RSqAT2qwjwbV1x5X2foQN5yUlKyNqMH5qvimVpy6ZxkaZUumEb29sf_MojFbRnO1WbjNFWo9Hj1JitA_-DB10MLB5OwUq58TTV2imFEjyErFqzmh8j2j-Iv9OAxG7vf9ndzfOxk5wOoDnWSjbTs3_PUZs91r6ZrvoovKxLEzNVU4QTWAuhREI0QI3Iv6ZWK9GZzY_vdiTonG1J1H_DgAA__-SY8Ek">