Add a failing test for SR-13785 #34462
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Adds a test for SR-13785:
If a symbol comes from two modules, one of which is marked as
@_implementationOnly
, Swift may choose the@_implementationOnly
source and then error out due to the symbol being hidden.Ideally, Swift would consider all sources for the symbol and recognize that the symbol is not hidden behind
@_implementationOnly
in all modules.