Open Radar

 
Summary:

Nested class with private/fileprivate methods could not be inherited in other frameworks. The nested type is defined in enum/struct/final class.


Steps to Reproduce:

1. git clone https://github.com/mitsuse/report-nested-type-inheritance
2. cd report-nested-type-inheritance && git checkout 9d0800d884334b38b9837a73ab476261c80ec53b
3. open ReportNestedTypeInheritance.xcodeproj
4. Build with the scheme B.


Expected Results:

Xcode can find symbols for methods of `A.X.Y`' and `B.Z` can inherit `A.X.Y` successfully.


Actual Results:

Build failed with errors as follow:

```
Undefined symbols for architecture arm64:
  "__T01A1XO1YC5test133_85030A24B48F8A101D9CEEE9CBF80A9ALLyyF", referenced from:
      __T01B1ZCN in B.o
  "__T01A1XO1YC5test233_85030A24B48F8A101D9CEEE9CBF80A9ALLyyF", referenced from:
      __T01B1ZCN in B.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```


Version/Build:

- Xcode 9.0 GM
- Swift 4.0


Configuration:

Please check the build settings etc. for details


Note: 

This problem is not reproduced in Swift Package Manager with similar configuration.
The below package-description is what I used with Swift Package Manager.

```
// swift-tools-version:4.0

import PackageDescription

let package = Package(
    name: "ReportNestedTypeInheritation",
    products: [
        .library(name: "B", targets: ["B"]),
    ],
    dependencies: [
    ],
    targets: [
        .target(name: "A", dependencies: []),
        .target(name: "B", dependencies: ["A"]),
    ]
)
```