| // RUN: %target-typecheck-verify-swift |
| |
| class Base<T> {} |
| class Derived : Base<Int> {} |
| |
| func casts<T, U>( |
| baseT: Base<T>, baseU: Base<U>, |
| baseInt: Base<Int>, baseString: Base<String>, |
| derived: Derived) { |
| let _ = baseT as? Base<U> |
| let _ = baseT as? Base<Int> |
| let _ = baseT as? Base<String> |
| let _ = baseT as? Derived |
| |
| let _ = baseInt as? Base<T> |
| let _ = baseInt as? Base<String> // expected-warning {{always fails}} |
| let _ = baseInt as? Derived |
| |
| let _ = derived as? Base<T> |
| let _ = derived as? Base<Int> // expected-warning {{always succeeds}} |
| let _ = derived as? Base<String> // expected-warning {{always fails}} |
| } |
| |
| class Pair<T, U> {} |
| class DerivedPair : Pair<Int, String> {} |
| |
| func invalidCast<T>(pair: Pair<T, T>, derivedPair: Derived) { |
| let _ = pair as? DerivedPair |
| // expected-warning@-1 {{cast from 'Pair<T, T>' to unrelated type 'DerivedPair' always fails}} |
| let _ = derivedPair as? Pair<T, T> |
| // expected-warning@-1 {{cast from 'Derived' to unrelated type 'Pair<T, T>' always fails}} |
| } |
| |
| func archetypeCasts<T, BT : Base<T>, BI : Base<Int>, BS : Base<String>, D : Derived>( |
| bt: BT, |
| bi: BI, |
| bs: BS, |
| d: D) { |
| let _ = bt as? BI |
| let _ = bt as? BS |
| let _ = bt as? D |
| |
| let _ = bi as? BT |
| let _ = bi as? BS // expected-warning {{always fails}} |
| let _ = bt as? D |
| |
| let _ = d as? BI |
| let _ = d as? BS // expected-warning {{always fails}} |
| let _ = d as? BT |
| } |
