Because the data formatter for the compiler internals was registering itself as
swift, it was hiding the default data formatters for swift code.
rdar://125114526
Without `--expand`, only the summary is shown, no child nodes. Adding `--expand` allows
for printing the child nodes, to be printed too.
Follow up to https://github.com/apple/swift/pull/40568
Just something I cooked up really quickly b/c I needed it. If you want to use
this, lldb-with-tools will auto-import it, so I suggest that you use that.
