b171ebbfff
We defend against a direct cycle where a base class ValueObject is its own parent, but not against a longer base cycle. This cycle requires that some value's Type includes a base class, and that base class is in a class hierarchy that cycles back to the original base class. I wrote a test case that creates a cycle in the class hierarchy by dynamically overwriting the superclass of an object, but I can't reproduce the crash. I can't think of any other way to make a real object that behaves that way. Maybe is a type system problem in making up the type for whatever type we're trying to ingest here. While unsatisfying, without a reproducer this is the best we can do for now. rdar://140293233
The LLVM Compiler Infrastructure
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