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25 lines
1.4 KiB
Swift
25 lines
1.4 KiB
Swift
// RUN: %target-typecheck-verify-swift
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let ok = "A" as Character // OK
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let succeed = "A" as? String // expected-warning {{always succeeds}}
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let bad = "A" as? Character // expected-warning {{conditional downcast from literal to 'Character' always fails; consider using 'as' coercion}} {{none}}
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let bad2 = "Aa" as? Character // expected-warning {{cast from 'String' to unrelated type 'Character' always fails}}
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let bad1 = 1 as? Character // expected-warning {{cast from 'Int' to unrelated type 'Character' always fails}}
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let okInt = 1 as Int // OK
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let badInt = 1 as? Int // expected-warning {{always succeeds}}
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let badInt1 = 1.0 as? Int // expected-warning {{cast from 'Double' to unrelated type 'Int' always fails}}
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let badInt2 = 1 as? Double // expected-warning {{conditional downcast from literal to 'Double' always fails; consider using 'as' coercion}} {{none}}
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let okUInt = 1 as UInt // OK
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let badUInt = 1 as? UInt // expected-warning {{conditional downcast from literal to 'UInt' always fails; consider using 'as' coercion}} {{none}}
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let badUInt1 = 1.0 as? UInt // expected-warning {{cast from 'Double' to unrelated type 'UInt' always fails}}
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// Custom protocol adoption
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struct S: ExpressibleByStringLiteral {
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typealias StringLiteralType = String
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init(stringLiteral value: Self.StringLiteralType) {}
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}
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let a = "A" as? S // expected-warning {{conditional downcast from literal to 'S' always fails; consider using 'as' coercion}} {{none}}
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