x = 10
x = 20
x = 30

x = 10
x = 20
Stack dump:
0.  Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift -frontend -interpret crasher.swift -enable-objc-interop -stack-check -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -color-diagnostics -module-name crasher
1.  Apple Swift version 5.2.4 (swiftlang-1103.0.32.9 clang-1103.0.32.53)
2.  While running user code "crasher.swift"
0  swift                    0x000000011395a4ea PrintStackTraceSignalHandler(void*) + 42
1  swift                    0x0000000113959cc0 SignalHandler(int) + 352
2  libsystem_platform.dylib 0x00007fff6f7a95fd _sigtramp + 29
3  libswiftCore.dylib       0x00007fff6ef4bc08 $ss5UInt8Vs23CustomStringConvertiblesMc + 0
4  libswiftFoundation.dylib 0x00007fff6f069f71 $s10Foundation4DataV9copyBytes2to4fromSiSryxG_SnySiGSgtlF + 209
5  libswiftFoundation.dylib 0x000000011806dbb5 $s10Foundation4DataV9copyBytes2to4fromSiSryxG_SnySiGSgtlF + 2835365141
6  libswiftFoundation.dylib 0x000000011806d87c $s10Foundation4DataV9copyBytes2to4fromSiSryxG_SnySiGSgtlF + 2835364316
7  libswiftFoundation.dylib 0x000000011806dbf8 $s10Foundation4DataV9copyBytes2to4fromSiSryxG_SnySiGSgtlF + 2835365208
8  libswiftCore.dylib       0x00007fff6ecca5ac $ss17withUnsafePointer2to_q_xz_q_SPyxGKXEtKr0_lF + 12
9  libswiftCore.dylib       0x00007fff6eeb7899 $ss24withUnsafeMutablePointer2to_q_xz_q_SpyxGKXEtKr0_lF + 9
10 libswiftCore.dylib       0x000000011806d534 $ss24withUnsafeMutablePointer2to_q_xz_q_SpyxGKXEtKr0_lF + 2837142692
11 swift                    0x000000010f6dd0aa llvm::MCJIT::runFunction(llvm::Function*, llvm::ArrayRef<llvm::GenericValue>) + 458
12 swift                    0x000000010f6e411b llvm::ExecutionEngine::runFunctionAsMain(llvm::Function*, std::__1::vector<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, std::__1::allocator<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > > > const&, char const* const*) + 2011
13 swift                    0x000000010f6b91da performCompileStepsPostSILGen(swift::CompilerInstance&, swift::CompilerInvocation&, std::__1::unique_ptr<swift::SILModule, std::__1::default_delete<swift::SILModule> >, bool, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, bool, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 14362
14 swift                    0x000000010f6adb95 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 55813
15 swift                    0x000000010f623b73 main + 1283
16 libdyld.dylib            0x00007fff6f5b0cc9 start + 1