[SoM] Code generation failure with struct with Equatable protocol

[chamons]

		[Test]
		public void FunctionReturnsStructWithProtocol ()
		{
			string swiftCode = @"public struct FunctionStruct : Equatable {
	public var X:Int32 = 0;
	public init(x:Int32) {
		X = x;
	}
	
	public static func == (lhs: FunctionStruct, rhs: FunctionStruct) -> Bool {
		return lhs.X == rhs.X;
	}
}

public func RetunsStruct (s: String, x: Int32) -> FunctionStruct { return FunctionStruct (x: x); }";

			CSSimpleType structType = (CSSimpleType)"FunctionStruct";
			CSLine structDecl = CSVariableDeclaration.VarLine (structType, "foo", CSFunctionCall.Ctor (structType.ToString (), CSConstant.Val (42)));
			CSLine printer = CSFunctionCall.ConsoleWriteLine ((CSIdentifier)"foo.X");

			TestRunning.TestAndExecute (swiftCode, CSCodeBlock.Create (structDecl, printer), "42\n");
		}

System.Exception : Failed to execute (exit code 1): /Library/Frameworks/Mono.framework/Versions/Current/bin/mcs -unsafe -define:_MAC_TS_TEST_ -nowarn:CS0169 -out:NameNotImportant.exe  /Users/donblas/Programming/maccore/tools/tom-swifty/tests/tom-swifty-test/bin/Debug/swift-o-matic-tests/3/FunctionStructSwiftMethodWrapTests.cs /Users/donblas/Programming/maccore/tools/tom-swifty/tests/tom-swifty-test/bin/Debug/swift-o-matic-tests/3/NameNotImportant.cs /Users/donblas/Programming/maccore/tools/tom-swifty/tests/tom-swifty-test/bin/Debug/swift-o-matic-tests/3/TopLevelEntitiesSwiftMethodWrapTests.cs -lib:/Users/donblas/Programming/maccore/tools/tom-swifty/tests/tom-swifty-test/bin/Debug/../../../../SwiftRuntimeLibrary/bin/Debug -r:SwiftRuntimeLibrary 
/Users/donblas/Programming/maccore/tools/tom-swifty/tests/tom-swifty-test/bin/Debug/swift-o-matic-tests/3/FunctionStructSwiftMethodWrapTests.cs(13,18): error CS0535: `SwiftMethodWrapTests.FunctionStruct' does not implement interface member `SwiftRuntimeLibrary.ISwiftEquatable.OpEquals(SwiftRuntimeLibrary.ISwiftEquatable)'
/Users/donblas/Programming/maccore/tools/tom-swifty/tests/tom-swifty-test/bin/Debug/../../../../SwiftRuntimeLibrary/bin/Debug/SwiftRuntimeLibrary.dll (Location of the symbol related to previous error)
Compilation failed: 1 error(s), 0 warnings

Output: https://gist.github.com/chamons/d296e8cca4bd20c4857e3fc7f83dcb92