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5aea1315cd
Introduce an attribute @_disfavoredOverload that can be used to state that a particular declaration should be avoided if there is a successful type-check for a non-@_disfavoredOverload. It's a way to nudge overload resolution away from particular solutions.
38 lines
665 B
Swift
38 lines
665 B
Swift
// RUN: %target-typecheck-verify-swift
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struct A { }
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struct B { }
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@_disfavoredOverload
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func f0<T>(_: T) -> A { return A() }
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func f0(_: Int32) -> B { return B() }
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func f1(_: StaticString) -> B { return B() }
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@_disfavoredOverload
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func f1<T>(_: T) -> A { return A() }
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func f2(_: Substring) -> B { return B() }
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@_disfavoredOverload
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func f2<T>(_: T) -> A { return A() }
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func test(s: String, answer: Int) {
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let r0a = f0(17)
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let _: B = r0a
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let r0b = f0(answer)
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let _: A = r0b
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let r1 = f1("hello")
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let _: B = r1
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let r2a = f2("hello")
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let _: B = r2a
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let r2b = f2("the answer is \(answer)")
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let _: B = r2b
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let r2c = f2(s)
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let _: A = r2c
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}
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