[lldb-dev] "error: summary string parsing error" on Fedora 30

[Bob Eastbrook via lldb-dev]

With Clang 8.0.0 and libstd++ 9.1.1 on Fedora 30 x86_64, I get this
error from LLDB when trying to see the value of a string:

"error: summary string parsing error"

The code is simply:

std::string msg{"foo bar baz"};

With libcxx 8.0.0, instead of the above error, I simply see "??" when
inspecting the msg variable.

All of the above works fine for me in Ubuntu 19.04. I only have the
problem with Fedora 30.  Tried in both CLion and VS Code.

How should I troubleshoot this?  Could I be missing a package?