duplicates:

• SR-10845 Fatal Error Encountered While Reading from Module 'Foundation'

Issue Description:

swift-5.1-DEVELOPMENT-SNAPSHOT-2019-06-14-a

When building a simple Kitura project on macOS, with swift-5.1-DEVELOPMENT-SNAPSHOT-2019-06-14-a, compiler crashes. Let me know if you need more information.

:0: error: fatal error encountered while reading from module 'Foundation'; please file a bug report with your project and the crash log

*** DESERIALIZATION FAILURE (please include this section in any bug report) ***
top-level value not found
Cross-reference to module 'Foundation'
... NSOrderedCollectionChange

Stack dump:
0. Program arguments: /Users/marcinkrzyzanowski/Devel/SwiftStudio/Toolchains/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-06-14-a/usr/bin/swift -frontend -c /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/checkouts/BlueSocket/Sources/Socket/Socket.swift -primary-file /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/checkouts/BlueSocket/Sources/Socket/SocketProtocols.swift /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/checkouts/BlueSocket/Sources/Socket/SocketUtils.swift -emit-module-path /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/x86_64-apple-macosx/debug/Socket.build/SocketProtocolspartial.swiftmodule -emit-module-doc-path /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/x86_64-apple-macosx/debug/Socket.build/SocketProtocolspartial.swiftdoc -emit-dependencies-path /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/x86_64-apple-macosx/debug/Socket.build/SocketProtocols.d -emit-reference-dependencies-path /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/x86_64-apple-macosx/debug/Socket.build/SocketProtocols.swiftdeps -target x86_64-apple-macosx10.10 -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -I /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/x86_64-apple-macosx/debug -I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -enable-testing -g -module-cache-path /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/x86_64-apple-macosx/debug/ModuleCache -swift-version 5 -Onone -D SWIFT_PACKAGE -D DEBUG -color-diagnostics -enable-anonymous-context-mangled-names -parse-as-library -module-name Socket -o /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/x86_64-apple-macosx/debug/Socket.build/SocketProtocols.swift.o -index-store-path /Users/marcinkrzyzanowski/Devel/SwiftStudio/Examples/Kitura/Hello/.build/x86_64-apple-macosx/debug/index/store -index-system-modules

1. While walking into decl extension of CollectionDifference<τ_0_0>.Change (in module 'Foundation')
2. While reading from 'Foundation'
3. While finishing conformance for protocol conformance to '_ObjectiveCBridgeable' (in module 'Swift') for type 'CollectionDifference.Change'
   0 swift 0x000000010f64d5b5 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
   1 swift 0x000000010f64c8a5 llvm::sys::RunSignalHandlers() + 85
   2 swift 0x000000010f64db98 SignalHandler(int) + 264
   3 libsystem_platform.dylib 0x00007fff7a5a0b5d _sigtramp + 29
   4 libsystem_platform.dylib 0x00000001228deb76 _sigtramp + 2821972022
   5 libsystem_c.dylib 0x00007fff7a45a6a6 abort + 127
   6 swift 0x000000010f9bdf53 swift::ModuleFile::fatal(llvm::Error) + 627
   7 swift 0x000000010c864413 swift::ModuleFile::finishNormalConformance(swift::NormalProtocolConformance*, unsigned long long) + 4611
   8 swift 0x000000010cb6a0e1 swift::RootProtocolConformance::hasWitness(swift::ValueDecl*) const + 97
   9 swift 0x000000010c0b6e9b void swift::RootProtocolConformance::forEachValueWitness<(anonymous namespace)::IndexSwiftASTWalker::handleWitnesses(swift::Decl*, llvm::SmallVectorImpl<(anonymous namespace)::IndexedWitness>&)::$_0>(swift::LazyResolver*, (anonymous namespace)::IndexSwiftASTWalker::handleWitnesses(swift::Decl*, llvm::SmallVectorImpl<(anonymous namespace)::IndexedWitness>&)::$_0) const + 123
   10 swift 0x000000010c0b6131 (anonymous namespace)::IndexSwiftASTWalker::startEntity(swift::Decl*, swift::index::IndexSymbol&, bool) + 385
   11 swift 0x000000010c0b4c85 (anonymous namespace)::IndexSwiftASTWalker::walkToDeclPre(swift::Decl*, swift::CharSourceRange) + 3973
   12 swift 0x000000010c0664fb (anonymous namespace)::SemaAnnotator::walkToDeclPre(swift::Decl*) + 1195
   13 swift 0x000000010ca8d2ba (anonymous namespace)::Traversal::doIt(swift::Decl*) + 170
   14 swift 0x000000010ca8d1fb swift::Decl::walk(swift::ASTWalker&) + 27
   15 swift 0x000000010cb44496 swift::FileUnit::walk(swift::ASTWalker&) + 246
   16 swift 0x000000010cb43160 swift::ModuleDecl::walk(swift::ASTWalker&) + 96
   17 swift 0x000000010c064d50 swift::SourceEntityWalker::walk(swift::ModuleDecl&) + 176
   18 swift 0x000000010c0b3aab (anonymous namespace)::IndexSwiftASTWalker::visitModule(swift::ModuleDecl&, llvm::StringRef) + 155
   19 swift 0x000000010c0b3cd1 swift::index::indexModule(swift::ModuleDecl*, llvm::StringRef, swift::index::IndexDataConsumer&) + 465
   20 swift 0x000000010c0bd1a0 addModuleDependencies(llvm::ArrayRef<std::__1::pair<llvm::ArrayRef<std::__1::pair<swift::Identifier, swift::SourceLoc> >, swift::ModuleDecl*> >, llvm::StringRef, bool, llvm::StringRef, clang::CompilerInstance const&, swift::DiagnosticEngine&, clang::index::IndexUnitWriter&, (anonymous namespace)::StringScratchSpace&) + 2400
   21 swift 0x000000010c0bc00e recordSourceFileUnit(swift::SourceFile*, llvm::StringRef, llvm::StringRef, bool, bool, llvm::StringRef, llvm::ArrayRef<clang::FileEntry const*>, clang::CompilerInstance const&, swift::DiagnosticEngine&) + 686
   22 swift 0x000000010c0bbcfb swift::index::indexAndRecord(swift::SourceFile*, llvm::StringRef, llvm::StringRef, bool, bool, llvm::StringRef, swift::DependencyTracker const&) + 219
   23 swift 0x000000010be07ae8 emitIndexDataIfNeeded(swift::SourceFile*, swift::CompilerInvocation const&, swift::CompilerInstance&) + 328
   24 swift 0x000000010be02d0a performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 14202
   25 swift 0x000000010bdfe5c2 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2978
   26 swift 0x000000010bda85a8 main + 696
   27 libdyld.dylib 0x00007fff7a3b53d5 start + 1