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46 lines
1.6 KiB
Swift
46 lines
1.6 KiB
Swift
// RUN: %target-typecheck-verify-swift
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class C : Hashable {
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var x = 0
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var hashValue: Int {
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return x
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}
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}
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func == (x: C, y: C) -> Bool { return true }
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class D : C {}
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// Unrelated to the classes above.
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class U : Hashable {
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var hashValue: Int {
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return 0
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}
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}
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func == (x: U, y: U) -> Bool { return true }
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// Test dictionary forced downcasts
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var dictCC = Dictionary<C, C>()
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var dictCD = dictCC as! Dictionary<C, D>
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var dictDC = dictCC as! Dictionary<D, C>
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var dictDD = dictCC as! Dictionary<D, D>
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// Test dictionary conditional downcasts
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if let _ = dictCC as? Dictionary<C, D> { }
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if let _ = dictCC as? Dictionary<D, C> { }
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if let _ = dictCC as? Dictionary<D, D> { }
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// Test dictionary downcasts to unrelated types.
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dictCC as Dictionary<D, U> // expected-error{{cannot convert value of type 'Dictionary<C, C>' to type 'Dictionary<D, U>' in coercion}}
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dictCC as Dictionary<U, D> // expected-error{{cannot convert value of type 'Dictionary<C, C>' to type 'Dictionary<U, D>' in coercion}}
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dictCC as Dictionary<U, U> // expected-error{{cannot convert value of type 'Dictionary<C, C>' to type 'Dictionary<U, U>' in coercion}}
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// Test dictionary conditional downcasts to unrelated types
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if let _ = dictCC as? Dictionary<D, U> { } // expected-warning{{cast from 'Dictionary<C, C>' to unrelated type 'Dictionary<D, U>' always fails}}
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if let _ = dictCC as? Dictionary<U, D> { } // expected-warning{{cast from 'Dictionary<C, C>' to unrelated type 'Dictionary<U, D>' always fails}}
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if let _ = dictCC as? Dictionary<U, U> { } // expected-warning{{cast from 'Dictionary<C, C>' to unrelated type 'Dictionary<U, U>' always fails}}
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