mgorny added inline comments.

================
Comment at: lldb/source/Host/posix/ConnectionFileDescriptorPosix.cpp:772-774
+  llvm::Error error = llvm::Error::success();
+  m_io_sp = std::make_shared<SerialPort>(fd, File::eOpenOptionReadWrite,
+                                         serial_options.get(), true, error);
----------------
labath wrote:
> It would be better to hide this by making the constructor private and have a 
> static factory function returning `Expected<unique_ptr<SerialPort>>`. Bonus 
> points if you can move all the fallible operations into the factory function 
> so that the (now private) constructor does not need the Error argument at all
I know but I couldn't make this work — the compiler just won't find a way to 
convert the new `SerialPort` instance into `Expected<SerialPort>`. I suspect I 
would have to add move ctors and assignment operators all the way up the class 
hierarchy.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D111355/new/

https://reviews.llvm.org/D111355

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