Ellie Shin d182d01c28 Handle package exportability. ...

This PR treats package access level as exportable, preventing
internally imported types from accidentally being declared in
package decl signatures.

Added package-specific cases to ExportabilityReason and
DisallowedOriginKind to track the validity of imported types
at use sites with package access scope. Added tests to cover
variety of use cases.

Resolves rdar://117586046&125050064&124484388&124306642

2024-05-02 05:17:03 -07:00

138 KiB

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