// RUN: %swift-ide-test --code-completion --source-filename %s --code-completion-token=COMPLETE

Foo.#^COMPLETE^#bar ?? baz(_) = baba

Assertion failed: (!assign->isFolded() && "already folded assign expr in sequence?!"), function makeBinOp, file /Users/alex/swift-src/swift/lib/Sema/TypeCheckExpr.cpp, line 366.
PLEASE submit a bug report to https://bugs.llvm.org/ and include the crash backtrace.
Stack dump:
0.  Program arguments: /Users/alex/swift-src/nbuild/Release+Asserts/bin/swift-ide-test -module-cache-path /Users/alex/swift-src/nbuild/Release+Asserts/swift-test-results/x86_64-apple-macosx10.9/clang-module-cache -completion-cache-path /Users/alex/swift-src/nbuild/Release+Asserts/swift-test-results/x86_64-apple-macosx10.9/completion-cache -swift-version 4 --code-completion --source-filename /Users/alex/swift-src/swift/test/SourceKit/test.swift --code-completion-token=COMPLETE
1.  While performing new completion
2.  While evaluating request CodeCompletionSecondPassRequest(source_file "/Users/alex/swift-src/swift/test/SourceKit/test.swift", )
3.  While code-completion expression at [/Users/alex/swift-src/swift/test/SourceKit/test.swift:3:1 - line:3:22] RangeText="Foo.bar ?? baz(_) = "
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  swift-ide-test           0x0000000106df83e7 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 39
1  swift-ide-test           0x0000000106df72e8 llvm::sys::RunSignalHandlers() + 248
2  swift-ide-test           0x0000000106df8a16 SignalHandler(int) + 262
3  libsystem_platform.dylib 0x00007fff204c9d7d _sigtramp + 29
4  libsystem_platform.dylib 000000000000000000 _sigtramp + 18446603339974271648
5  libsystem_c.dylib        0x00007fff203d9411 abort + 120
6  libsystem_c.dylib        0x00007fff203d87e8 err + 0
7  swift-ide-test           0x00000001073455f3 makeBinOp(swift::ASTContext&, swift::Expr*, swift::Expr*, swift::Expr*, swift::PrecedenceGroupDecl*, bool) (.cold.6) + 35
8  swift-ide-test           0x0000000103319851 makeBinOp(swift::ASTContext&, swift::Expr*, swift::Expr*, swift::Expr*, swift::PrecedenceGroupDecl*, bool) + 593
9  swift-ide-test           0x0000000103318522 swift::TypeChecker::foldSequence(swift::SequenceExpr*, swift::DeclContext*) + 82
10 swift-ide-test           0x0000000103267230 (anonymous namespace)::PreCheckExpression::walkToExprPost(swift::Expr*) + 272
11 swift-ide-test           0x000000010242ac23 swift::Expr::walk(swift::ASTWalker&) + 115
12 swift-ide-test           0x0000000103265c3c swift::constraints::ConstraintSystem::preCheckExpression(swift::Expr*&, swift::DeclContext*, bool) + 332
13 swift-ide-test           0x00000001032aa15b swift::TypeChecker::typeCheckForCodeCompletion(swift::constraints::SolutionApplicationTarget&, bool, llvm::function_ref<void (swift::constraints::Solution const&)>) + 763
14 swift-ide-test           0x00000001032ab41e swift::DotExprTypeCheckCompletionCallback::fallbackTypeCheck() + 190
15 swift-ide-test           0x0000000102716e52 (anonymous namespace)::CodeCompletionCallbacksImpl::doneParsing() + 482
16 swift-ide-test           0x000000010362d878 swift::Parser::performCodeCompletionSecondPassImpl(swift::CodeCompletionDelayedDeclState&) + 888
17 swift-ide-test           0x000000010362d3f8 swift::CodeCompletionSecondPassRequest::evaluate(swift::Evaluator&, swift::SourceFile*, swift::CodeCompletionCallbacksFactory*) const + 232
18 swift-ide-test           0x0000000103637aef llvm::Expected<swift::CodeCompletionSecondPassRequest::OutputType> swift::Evaluator::getResultUncached<swift::CodeCompletionSecondPassRequest>(swift::CodeCompletionSecondPassRequest const&) + 271
19 swift-ide-test           0x000000010362d207 swift::CodeCompletionSecondPassRequest::OutputType swift::evaluateOrDefault<swift::CodeCompletionSecondPassRequest>(swift::Evaluator&, swift::CodeCompletionSecondPassRequest, swift::CodeCompletionSecondPassRequest::OutputType) + 55
20 swift-ide-test           0x000000010273c481 swift::ide::CompletionInstance::performNewOperation(llvm::Optional<llvm::hash_code>, swift::CompilerInvocation&, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, llvm::MemoryBuffer*, unsigned int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&, swift::DiagnosticConsumer*, llvm::function_ref<void (swift::CompilerInstance&, bool)>) + 529
21 swift-ide-test           0x000000010273c918 swift::ide::CompletionInstance::performOperation(swift::CompilerInvocation&, llvm::ArrayRef<char const*>, llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem>, llvm::MemoryBuffer*, unsigned int, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >&, swift::DiagnosticConsumer*, llvm::function_ref<void (swift::CompilerInstance&, bool)>) + 680
22 swift-ide-test           0x0000000102340300 doCodeCompletionImpl(swift::CodeCompletionCallbacksFactory*, swift::CompilerInvocation const&, llvm::StringRef, llvm::StringRef, llvm::StringRef, bool) + 1376
23 swift-ide-test           0x0000000102332d00 main + 26144
24 libdyld.dylib            0x00007fff2049ff3d start + 1
25 libdyld.dylib            0x000000000000000b start + 18446603339974443215