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Joe Groff a3c4a711db Serialization: Exclude types from the same module as dependencies of an enum.

There can be a circularity when two enums recur through each other, and deserialization currently is not set up to robustly detect and avoid these circularities. This should avoid regressions, but re-exposes some possible cases that should require recovery in mix-and-match situations. Short-term fix for rdar://problem/32337278.

2017-05-23 13:39:00 -07:00

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	`public enum TweedleDum {`
	`indirect case dee(TweedleDee)`
	`}`