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For one thing, why is this a command at all? If we support keeping convenience variables across symbol file reloads, then why not do it by default for all convenience variables? I doubt having them disappear has ever been considered a feature.
Alternatively, we could add code to duplicate the types recursively onto a convenience variable obstack. GDB doesn't have much of a notion of "type compatibility". It might not work 100% right for things like C++ operator overloading, but for that we'd need to do type merging anyway.
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