public func foo(
    arg1: Swift.Bool,
    arg2: Swift.Int8,
    arg3: Swift.Int16,
    arg4: Swift.Int32,
    arg5: Swift.Int64,
    arg6: Swift.Double,
    arg7: Swift.Float,
    arg8: Swift.Unicode.UTF16.CodeUnit,
    arg9: Swift.Bool?
) -> Swift.Bool {
    stub()
}