[lldb-dev] SBValues that are synthetic has API issues when trying to get the child by name:

[Greg Clayton via lldb-dev]

   3    int main(int argc, const char **argv) {
   4      std::atomic<int> ai;
   5      ai = argc;
-> 6      ai = argc + 1;
   7      return 0;
   8    }


(lldb) fr var ai
(std::atomic<int>) ai = {
  Value = 1
}
(lldb) frame var --raw ai
(std::__1::atomic<int>) ai = {
  std::__1::__atomic_base<int, true> = {
    std::__1::__atomic_base<int, false> = {
      __a_ = 1
    }
  }
}

So we have a synthetic child provider. But if we do:

(lldb) script
>>> v = lldb.frame.FindVariable('ai')
>>> print(v.GetNumChildren())
1
>>> print(v.GetChildAtIndex(0))
(int) Value = 1

But if we ask for it by name it doesn't work:

>>> print(v.GetChildMemberWithName('Value'))
No value

Bug? Intentional?
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