// RUN: %target-typecheck-verify-swift -swift-version 4 | |
// expect-no-diagnostics | |
struct X { } | |
postfix func ++(x: X) -> X { return x } | |
prefix func ++(x: X) -> X { return x } | |
postfix func --(x: X) -> X { return x } | |
prefix func --(x: X) -> X { return x } |