struct Key {
    let key: String
    let localizedKey: String?
    
    init(key: String, localizedKey: String? = nil) {
        self.key = key
        self.localizedKey = localizedKey
    }
}


@propertyWrapper
class Wrapper<Value> {
    var wrappedValue: Value
    let key: Key
    init(wrappedValue: Value, key: Key) {
        self.wrappedValue = wrappedValue
        self.key = key
    }
}


class Test {
    @Wrapper(key: Key(key: "a")) var a = 3 // crash
//    @Wrapper(key: Key(key: "a", localizedKey: "localize_a")) var a = 3
}

1.  While silgen constructor initializer SIL function "@$s2UI4TestCACycfc".
 for 'init()' (at /Users/harry/dev/swift/UI/Sources/UI/Form/Row.swift:62:7)
0  swift                    0x000000010d3ba013 PrintStackTraceSignalHandler(void*) + 51
1  swift                    0x000000010d3b97e6 SignalHandler(int) + 358
2  libsystem_platform.dylib 0x00007fff7f9c9b5d _sigtramp + 29
3  libsystem_platform.dylib 0x00000000ffffffff _sigtramp + 2153997503
4  swift                    0x000000010944f2d6 void llvm::function_ref<void (swift::Expr*)>::callback_fn<swift::Lowering::SILGenFunction::emitMemberInitializers(swift::DeclContext*, swift::VarDecl*, swift::NominalTypeDecl*)::$_2>(long, swift::Expr*) + 38
5  swift                    0x000000010944e773 maybeEmitPropertyWrapperInitFromValue(swift::Lowering::SILGenFunction&, swift::SILLocation, swift::VarDecl*, swift::Lowering::RValue&&, llvm::function_ref<void (swift::Expr*)>) + 403
6  swift                    0x000000010944eff4 swift::Lowering::SILGenFunction::emitMemberInitializers(swift::DeclContext*, swift::VarDecl*, swift::NominalTypeDecl*) + 1364
7  swift                    0x0000000109451bef swift::Lowering::SILGenFunction::emitClassConstructorInitializer(swift::ConstructorDecl*) + 3951
8  swift                    0x0000000109401ea6 swift::Lowering::SILGenModule::emitConstructor(swift::ConstructorDecl*) + 3878
9  swift                    0x00000001094f40c4 (anonymous namespace)::SILGenType::emitType() + 1172
10 swift                    0x000000010940ad6d swift::ASTVisitor<swift::Lowering::SILGenModule, void, void, void, void, void, void>::visit(swift::Decl*) + 77
11 swift                    0x0000000109409fb6 swift::Lowering::SILGenModule::emitSourceFile(swift::SourceFile*) + 1238
12 swift                    0x000000010940ba16 swift::SILModule::constructSIL(swift::ModuleDecl*, swift::SILOptions&, swift::FileUnit*) + 1238
13 swift                    0x000000010900f8b9 performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 28345
14 swift                    0x00000001090051f4 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 6820
15 swift                    0x0000000108f92763 main + 1219
16 libdyld.dylib            0x00007fff7f7de3d5 start + 1
error: Segmentation fault: 11 (in target 'UI' from project 'UI')