Still seeing in Xcode 12.0.1. Tried adding SwiftUI as an explicit dependency marked 'Do Not Embed', but see the same.
dyld: Symbol not found: _$s7SwiftUI12ProgressViewVyxq_GAA0D0AAMc
Referenced from: /private/var/containers/Bundle/Application/E9FB9FBD-F564-4236-B208-84CC14E96629/SwiftUIStylingProto.app/SwiftUIStylingProto
Expected in: /System/Library/Frameworks/SwiftUI.framework/SwiftUI
in /private/var/containers/Bundle/Application/E9FB9FBD-F564-4236-B208-84CC14E96629/SwiftUIStylingProto.app/SwiftUIStylingProto
dyld: launch, loading dependent libraries
DYLD_LIBRARY_PATH=/usr/lib/system/introspection
DYLD_INSERT_LIBRARIES=/Developer/usr/lib/libBacktraceRecording.dylib:/Developer/usr/lib/libMainThreadChecker.dylib:/Developer/Library/PrivateFrameworks/DTDDISupport.framework/libViewDebuggerSupport.dylib
sstadelman
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I used johntmcintosh solution, thanks! FYI, the package doesn't actually need to be complete. I get away with creating an empty tmp Package.swift file in my active dir.