Defaults + Playgrounds iOS device crash repro

Summary

• This project reproduces a dyld crash on iOS devices when Playgrounds is imported in the app target and the Defaults package is present.
• The crash is due to libLiveExecutionResultsLogger.dylib being linked into the app binary, which does not exist on device.

Repro Steps

1. Open DefaultsPlaygroundsRepro.xcodeproj in Xcode.
2. Select a physical iOS device.
3. Build & run.

Expected

• App fails to launch on device with: dyld: Library not loaded: /usr/lib/swift/libLiveExecutionResultsLogger.dylib

Control Checks

• Comment out import Playgrounds and the #Playground {} block in DefaultsPlaygroundsRepro/PlaygroundTest.swift → app launches.
• Remove Defaults package dependency → app launches.

Why This Repro Exists

• The Defaults parameter-pack overload of Defaults.updates triggers Swift runtime pack allocation symbols.
• With Playgrounds present, those symbols resolve to libLiveExecutionResultsLogger during linking.
• That dylib is not present on iOS devices, so dyld fails at launch.

Key Files

• DefaultsPlaygroundsRepro/PlaygroundTest.swift (Playgrounds import + #Playground)
• DefaultsPlaygroundsRepro/DefaultsKeys.swift (Defaults key)
• DefaultsPlaygroundsRepro/ContentView.swift (uses Defaults to ensure linking)