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swift-mirror/lib/Sema/MiscDiagnostics.cpp
Doug Gregor 85611dbf25 Allow marker protocols as existentials (but still ban casts) 
There is no problem with having an existential value that involves a
marker protocol. However, since there is no runtime checking for
marker protocols, ban "as?" and "is" casts to them.
2021-02-18 23:44:39 -08:00

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