泛型 – 如何为嵌套在通用结构体中的类实现一个运算符？

struct Outer<T> {
    class Inner : Equatable {}
}

@infix func == <T>(lhs: Outer<T>.Inner,rhs: Outer<T>.Inner) -> Bool {
    return lhs === rhs
}

当我尝试运行该项目时，我收到以下错误：

While emitTing IR SIL function @_TFCC4Test5Outer5InnerCU__fMS1_FT_S1_ for 'init' at .../TesTing.swift:20:11
<unkNown>:0: error: unable to execute command: Segmentation fault: 11
<unkNown>:0: error: swift frontend command Failed due to signal (use -v to see invocation)
Command /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift Failed with exit code 254

然而，当我做同样的事情没有嵌套类时，它工作正常：

class MyClass : Equatable {}

@infix func == (lhs: MyClass,rhs: MyClass) -> Bool {
    return lhs === rhs
}

这是编译器的错误，还是我做错了？