Thanks, I managed to create a small test project with the same issue; I’ve filed it as SR-2288 <https://bugs.swift.org/browse/SR-2288>.
Saagar Jha > On Aug 4, 2016, at 21:01, Mark Lacey <mark.la...@apple.com> wrote: > >> >> On Aug 4, 2016, at 8:51 PM, Saagar Jha via swift-users >> <swift-users@swift.org <mailto:swift-users@swift.org>> wrote: >> >> Hello Swift Users, >> >> This afternoon I updated my Xcode to Xcode 8 beta 4, and tried to compile >> one of my previously migrated Swift 3 projects. Along with a couple of >> renames, the compiler kept crashing due to a segmentation fault. Since the >> issue appeared to be similar to SR-2227, which was supposedly fixed with a >> pull request a couple days ago, I downloaded today’s snapshot toolchain. The >> new toolchain throws an assertion: >> >> Assertion failed: (value != OpenExistentials.end() && "didn't see this OVE >> in a containing OpenExistentialExpr?"), function walkToExprPre, file >> /Users/buildnode/jenkins/workspace/oss-swift-package-osx/swift/lib/Sema/CSDiag.cpp, >> line 3082. >> 0 swift 0x000000010a932ebb >> llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 43 >> 1 swift 0x000000010a932106 >> llvm::sys::RunSignalHandlers() + 70 >> 2 swift 0x000000010a93360f SignalHandler(int) + 383 >> 3 libsystem_platform.dylib 0x00007fffa6122d7a _sigtramp + 26 >> 4 libsystem_platform.dylib 0x0000000100000001 _sigtramp + 1508758177 >> 5 swift 0x000000010a93335e abort + 14 >> 6 swift 0x000000010a933341 __assert_rtn + 81 >> 7 swift 0x0000000108431879 >> eraseOpenedExistentials(swift::Expr*&)::ExistentialEraser::walkToExprPre(swift::Expr*) >> + 361 >> 8 swift 0x00000001085b8ea5 (anonymous >> namespace)::Traversal::visit(swift::Expr*) + 4981 >> 9 swift 0x00000001085b6f75 >> swift::Expr::walk(swift::ASTWalker&) + 53 >> 10 swift 0x000000010842e375 (anonymous >> namespace)::FailureDiagnosis::typeCheckChildIndependently(swift::Expr*, >> swift::Type, swift::ContextualTypePurpose, swift::OptionSet<TCCFlags, >> unsigned int>, swift::ExprTypeCheckListener*) + 1221 >> 11 swift 0x0000000108434ea3 (anonymous >> namespace)::FailureDiagnosis::typeCheckArgumentChildIndependently(swift::Expr*, >> swift::Type, (anonymous namespace)::CalleeCandidateInfo const&, >> swift::OptionSet<TCCFlags, unsigned int>) + 1987 >> 12 swift 0x000000010843e9a1 (anonymous >> namespace)::FailureDiagnosis::visitApplyExpr(swift::ApplyExpr*) + 913 >> 13 swift 0x0000000108428f6a swift::ASTVisitor<(anonymous >> namespace)::FailureDiagnosis, bool, void, void, void, void, >> void>::visit(swift::Expr*) + 170 >> 14 swift 0x0000000108422888 >> swift::constraints::ConstraintSystem::diagnoseFailureForExpr(swift::Expr*) + >> 104 >> 15 swift 0x00000001084289a8 >> swift::constraints::ConstraintSystem::salvage(llvm::SmallVectorImpl<swift::constraints::Solution>&, >> swift::Expr*) + 4056 >> 16 swift 0x00000001084ab665 >> swift::TypeChecker::solveForExpression(swift::Expr*&, swift::DeclContext*, >> swift::Type, swift::FreeTypeVariableBinding, swift::ExprTypeCheckListener*, >> swift::constraints::ConstraintSystem&, >> llvm::SmallVectorImpl<swift::constraints::Solution>&, >> swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>) + 917 >> 17 swift 0x00000001084b17d1 >> swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, >> swift::TypeLoc, swift::ContextualTypePurpose, >> swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, >> swift::ExprTypeCheckListener*, swift::constraints::ConstraintSystem*) + 625 >> 18 swift 0x000000010852c061 swift::ASTVisitor<(anonymous >> namespace)::StmtChecker, void, swift::Stmt*, void, void, void, >> void>::visit(swift::Stmt*) + 545 >> 19 swift 0x000000010852c543 swift::ASTVisitor<(anonymous >> namespace)::StmtChecker, void, swift::Stmt*, void, void, void, >> void>::visit(swift::Stmt*) + 1795 >> 20 swift 0x000000010852bf8e swift::ASTVisitor<(anonymous >> namespace)::StmtChecker, void, swift::Stmt*, void, void, void, >> void>::visit(swift::Stmt*) + 334 >> 21 swift 0x000000010852b369 (anonymous >> namespace)::StmtChecker::typeCheckBody(swift::BraceStmt*&) + 25 >> 22 swift 0x000000010852a63f >> swift::TypeChecker::typeCheckFunctionBodyUntil(swift::FuncDecl*, >> swift::SourceLoc) + 383 >> 23 swift 0x000000010852a463 >> swift::TypeChecker::typeCheckAbstractFunctionBodyUntil(swift::AbstractFunctionDecl*, >> swift::SourceLoc) + 35 >> 24 swift 0x000000010852afe4 >> swift::TypeChecker::typeCheckAbstractFunctionBody(swift::AbstractFunctionDecl*) >> + 180 >> 25 swift 0x00000001084e5c56 >> typeCheckFunctionsAndExternalDecls(swift::TypeChecker&) + 166 >> 26 swift 0x00000001084e68f0 >> swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, >> swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int, >> unsigned int) + 1568 >> 27 swift 0x000000010818798c >> swift::CompilerInstance::performSema() + 3916 >> 28 swift 0x0000000107c82ad1 >> performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, >> llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*) + 449 >> 29 swift 0x0000000107c8163f >> swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, >> swift::FrontendObserver*) + 2895 >> 30 swift 0x0000000107c43ea0 main + 2448 >> 31 libdyld.dylib 0x00007fffa5f16255 start + 1 >> >> The stack trace doesn’t really help tell me what’s going wrong; does anyone >> have the same issue or know why this is happening? > > It’s a crash while trying to emit a diagnostic after failing to type check an > expression. We often print the expression in question after the stack trace, > so you might check to see if that is being emitted. It may help you find a > work-around. > >> Thanks, >> Saagar Jha >> >> P.S. Should I file a bug on the JIRA? > > Yes, please! > > Any crash is worthy of a bug report on JIRA. We’ll need a test case along > with instructions on how to reproduce the issue using that test case. Small, > self-contained source files are always ideal, but an entire project works too > if you cannot find a way to isolate it. > > Mark
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