sebmarkbage 38cdbc28fc Treat displayName as undefined (#26148)
When we have a key we read displayName eagerly for future warnings.

In general, React should be inspecting if something is a client
reference before dotting into it. However, we use displayName a lot and
it kind of has defined meaning for debugging everywhere it's used so
seems fine to treat this as undefined.

DiffTrain build for [c8510227c1](https://github.com/facebook/react/commit/c8510227c1b9c4049979b81e998ec40545e2ce9b)
[View git log for this commit](https://github.com/facebook/react/commits/c8510227c1b9c4049979b81e998ec40545e2ce9b)
2023-02-10 16:31:32 +00:00
2020-01-09 14:07:41 -08:00
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