================
@@ -259,14 +272,23 @@ 
lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::Update() {
   return lldb::ChildCacheState::eRefetch;
 }
 
-size_t lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::
+llvm::Expected<size_t>
+lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::
     GetIndexOfChildWithName(ConstString name) {
   if (!m_count || !m_base_data_address)
-    return UINT32_MAX;
+    return llvm::createStringError(
+        "'SyntheticChildrenFrontEnd::LibcxxVectorBoolSyntheticFrontEnd' cannot 
"
+        "find index of child '%s'. (m_count='" PRIu32
+        "', m_base_data_address='" PRIu32 "')",
----------------
Michael137 wrote:

```suggestion
        "find index of child '%s'. (m_count='" PRIu64
        "', m_base_data_address='" PRIu64 "')",
```

https://github.com/llvm/llvm-project/pull/136693
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