This seems to be fixed now in Beta 5. Had the same issues yesterday and found this thread, but today with Beta 5 doesn't crash anymore.
Paul_ie
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Same problem for me. Getting output in the console, however can't debug myself. If I print any description I get Printing description of self: expression produced no result, right after Cannot create Swift scratch context (couldn't load the Swift stdlib).
The weird thing is that this worked for me last week, I haven't made any changes to lldb either. I removed Chisel in order to see if that would resolve my issue, which is does not.