Open Radar

 
By attempting to implement the NSFilePresenter protocol, I encounter a compiler error in Swift. You can view more details here:

http://stackoverflow.com/questions/24070672/swift-compiler-error-while-conforming-to-protocol-by-providing-property-via-gett

The stack trace is:

0  swift                    0x000000010b10b608 llvm::sys::PrintStackTrace(__sFILE*) + 40
1  swift                    0x000000010b10baf4 SignalHandler(int) + 452
2  libsystem_platform.dylib 0x00007fff92578f1a _sigtramp + 26
3  libsystem_platform.dylib 0x00007fd0c225e968 _sigtramp + 802052712
4  swift                    0x000000010a74797a (anonymous namespace)::ObjCPrinter::visitVarDecl(swift::VarDecl*) + 762
5  swift                    0x000000010a746f7d swift::ASTVisitor<(anonymous namespace)::ObjCPrinter, void, void, void, void, void, void>::visit(swift::Decl*) + 125
6  swift                    0x000000010a74abcb (anonymous namespace)::ObjCPrinter::printMembers(swift::IteratorRange<swift::DeclIterator>) + 251
7  swift                    0x000000010a747603 swift::ASTVisitor<(anonymous namespace)::ObjCPrinter, void, void, void, void, void, void>::visit(swift::Decl*) + 1795
8  swift                    0x000000010a74638e swift::printAsObjC(llvm::raw_ostream&, swift::Module*) + 1934
9  swift                    0x000000010a4d0b6e printAsObjC(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, swift::Module*) + 286
10 swift                    0x000000010a4d0178 frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 3592
11 swift                    0x000000010a4cf35d main + 1533
12 libdyld.dylib            0x00007fff978e45c9 start + 1

Steps to Reproduce:
Occurs by simply adding this to any class, after adding NSFilePresenter to the list of conformed protocols.

var _trackingURL: NSURL! = ...

var presentedItemURL: NSURL! {
    return _trackingURL
}

var presentedItemOperationQueue: NSOperationQueue! {
    return NSOperationQueue.mainQueue()
}