Open Radar

 
Summary:
Enums can have static variables shadowing their cases but not static functions.

Steps to Reproduce:
1. This code:
enum E<F> {
	case C
	case D(F)
}
extension E {
	static var C: () { return () }
	static func D(_:Int) -> () {}
}

Expected Results:
should compile

Actual Results:
but does not:
boom.swift:7:14: error: invalid redeclaration of 'D'
        static func D(_:Int) -> () {}
                    ^
boom.swift:3:7: note: 'D' previously declared here
        case D(F)
             ^

Regression:
The static variable C is acceptable, but the static function D is not. This despite the fact that it does not actually redeclare or even shadow the case or the static func implicitly defined by the case; it just overloads it on the return type.
The static variable C is only acceptable because E is generic, making me wonder if in fact the bug is that C compiles. But I think overloading on return type ought to be accepted here.

Notes:
N/A