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    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Assertion `idx < size()' failed in HandleUnionActiveMemberChange"
   href="https://bugs.llvm.org/show_bug.cgi?id=45879">45879</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Assertion `idx < size()' failed in HandleUnionActiveMemberChange
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>clang
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Frontend
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>peter@pcc.me.uk
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>$ cat test-formatted.ii
struct a {
  char b = 0;
};

struct s {
  a f;
};

constexpr void m() {
  a l;
  l = s{}.f;
}

void p() { return m(); }
$ clang++ -c -o test.o test-formatted.ii -std=gnu++2a
clang++: ../llvm/include/llvm/ADT/SmallVector.h:180:
llvm::SmallVectorTemplateCommon::const_reference
llvm::SmallVectorTemplateCommon<clang::APValue::LValuePathEntry,
void>::operator[](llvm::SmallVectorTemplateCommon::size_type) const [T =
clang::APValue::LValuePathEntry]: Assertion `idx < size()' failed.</pre>
        </div>
      </p>


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