1.      While emitting SIL for 'enableTPU(infeed:)' at /Users/rxwei/Development/swift-source/swift/stdlib/public/TensorFlow/CompilerRuntime.swift:47:10
2.      While silgen emitFunction SIL function "@$S10TensorFlowAAO9enableTPU6infeedySb_tFZ".
 for 'enableTPU(infeed:)' at /Users/rxwei/Development/swift-source/swift/stdlib/public/TensorFlow/CompilerRuntime.swift:47:10
3.      While verifying SIL function "@$S10TensorFlowAAO9enableTPU6infeedySb_tFZ".
 for 'enableTPU(infeed:)' at /Users/rxwei/Development/swift-source/swift/stdlib/public/TensorFlow/CompilerRuntime.swift:47:10
[71/358] Generating /Users/rxwei/Development/swift-source/build/bui...wift-macosx-x86_64/./lib/swift/macosx/x86_64/Foundation.swiftmodule
/Users/rxwei/Development/swift-source/swift/stdlib/public/SDK/Foundation/NSRange.swift:200:21: warning: 'CustomPlaygroundQuickLookable' is deprecated: CustomPlaygroundQuickLookable will be removed in a future Swift version. For customizing how types are presented in playgrounds, use CustomPlaygroundDisplayConvertible instead.

                                        ^
Function: '$S10TensorFlowAAO9enableTPU6infeedySb_tFZ'
Error! Found a leaked owned value that was never consumed.
Value:   %9 = builtin "__tfop_tfc.configureTPU,enableInfeed"(%0 : $Bool) : $()

triggering standard assertion failure routine
UNREACHABLE executed at /Users/rxwei/Development/swift-source/swift/lib/SIL/SILOwnershipVerifier.cpp:1619!
0  swift                    0x0000000111b79ae8 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 40
1  swift                    0x0000000111b78a36 llvm::sys::RunSignalHandlers() + 86
2  swift                    0x0000000111b7a0ae SignalHandler(int) + 366
3  libsystem_platform.dylib 0x00007fff77dfcf5a _sigtramp + 26
4  swift                    0x00000001128b3b18 (anonymous namespace)::DarwinX86AsmBackend::getCompactUnwindRegNum(unsigned int) const::CU64BitRegs + 238062
5  libsystem_c.dylib        0x00007fff77c27312 abort + 127
6  swift                    0x0000000111b17540 LLVMInstallFatalErrorHandler + 0
7  swift                    0x000000010f167505 (anonymous namespace)::SILValueOwnershipChecker::handleError(llvm::function_ref<void ()>&&) const + 165
8  swift                    0x000000010f15c379 (anonymous namespace)::SILValueOwnershipChecker::check() + 2697
9  swift                    0x000000010f15b62f swift::SILValue::verifyOwnership(swift::SILModule&, swift::DeadEndBlocks*) const + 591
10 swift                    0x000000010f1510ab (anonymous namespace)::SILVerifier::visitSILInstruction(swift::SILInstruction*) + 3051
11 swift                    0x000000010f140b02 swift::SILInstructionVisitor<(anonymous namespace)::SILVerifier, void>::visit(swift::SILInstruction*) + 10418
12 swift                    0x000000010f13c43c (anonymous namespace)::SILVerifier::visitSILBasicBlock(swift::SILBasicBlock*) + 1212
13 swift                    0x000000010f138797 swift::SILFunction::verify(bool) const + 8631
14 swift                    0x000000010eb1b1ed swift::Lowering::SILGenModule::postEmitFunction(swift::SILDeclRef, swift::SILFunction*) + 205
15 swift                    0x000000010eb23777 swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*)::$_2::operator()(swift::SILFunction*) const + 327
16 swift                    0x000000010eb1ac2d swift::Lowering::SILGenModule::emitFunction(swift::FuncDecl*) + 733
17 swift                    0x000000010ebf7909 (anonymous namespace)::SILGenType::emitType() + 233
18 swift                    0x000000010ebf7819 swift::Lowering::SILGenModule::visitNominalTypeDecl(swift::NominalTypeDecl*) + 25
19 swift                    0x000000010eb2042b swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*, unsigned int) + 763
20 swift                    0x000000010eb21125 swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&, swift::FileUnit*, llvm::Optional<unsigned int>, bool) + 437
21 swift                    0x000000010eb2163c swift::performSILGeneration(swift::ModuleDecl*, swift::SILOptions&, bool) + 28
22 swift                    0x000000010e422898 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 14312
23 swift                    0x000000010e41e135 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2965
24 swift                    0x000000010e3d6099 main + 2249
25 libdyld.dylib            0x00007fff77b7b115 start + 1
Stack dump: